PCP Rifle WTS Huben K1 25cal for sale. Sold
- By IAfaug
- Member Classifieds
- 1 Replies
For sale I recent purchase of mine that needs to go
Bought it here from a member
2020 model roughly 1000 rounds thru it
I didn’t even mount a scope on it
Need to sell so I can buy the pistol
I have $1400 spilt shipping will sell for $1300 shipped to move it fast
Bought it here from a member
2020 model roughly 1000 rounds thru it
I didn’t even mount a scope on it
Need to sell so I can buy the pistol
I have $1400 spilt shipping will sell for $1300 shipped to move it fast
Pellet Spirals
- By Ballisticboy
- General Discussion
- 10 Replies
Recently I got to thinking about shooting to ranges of 100 yards and the problems with pellet spiralling at the longer ranges, so I thought I would try to have a look at it for a couple of pellet designs.
The two pellet designs are JSB pellets, not because they have particularly bad problems, but because I happen to have most modelling data on those two. I started with the .177 10.3 grain Heavy pellet with its more cylindrical shape, which in previous studies had shown a tendency to increased yaw angles at longer ranges and higher speeds. I then scaled up the design to .22 to see what happened. The .22 pellet came out at 19.7 grains. I used a muzzle velocity of 950 ft/sec, simply because it seemed a reasonable starting point, and a barrel twist rate of one turn in 16 inches.
The predicted trajectory for the .22 calibre scaled up pellet is shown below.
You can see there is definitely a problem showing up here. A perfect pellet of the same configuration and calibre fired perfectly from a gun will give the flight profile below.
Much better but still with apparent problems at long range.
The next stage is to look if another pellet design acts the same. Data is available for the JSB 15.9 grain .22 pellet, so this one was modelled. The result is shown below with the same initial yaw rate.
The result is predicting much better behaviour, but there is still a tendency towards spiral type problems.
The result for a perfect pellet fired perfectly is shown below.
This round is showing acceptable behaviour.
The accepted way for reducing pellet spiralling at long ranges is to use lower twist rates and a reduced velocity. The improvements can be seen below where the .177 JSB Heavy has been fired at a muzzle velocity of 850 ft/sec from a barrel with a one turn in 32 inches twist rate. Previous trajectories had been modelled with a simple initial yaw rate for simplicity. As a problem had been suggested in the modelling using a simple yaw rate, a more complex system of pellet flaws was used from now on. The first diagram shows the predicted behaviour of a pellet with a CG offset from the pellet centreline and with a flat spot on the front facing part of the nose giving an asymmetry, i.e. a pellet with flaws.
The effects compared to the trajectory of the .22 calibre version at 950 ft/sec, with a 16 inch twist rate barrel and a simpler pellet flaw are much reduced but still present.
Using a perfect pellet with no flaws and a perfect barrel, the trajectory looks like this.
This is probably a usable trajectory, but there still seems to be possible problems as the range increases, and again hoping for a perfect pellet is not a good idea.
The problem with using guns with low twist barrels which are a perfect fit to your choice of pellets, and have lower muzzle velocities, is that changes to the gun are being used to try to solve what is basically a pellet problem. In addition, not everyone can afford a new gun or even a new barrel with the fitting costs, if they do not have the necessary skills or knowledge to do it themselves.
The cause of the problems with the pellets is two fold. One is the lack of dynamic stability, which enables pellet yaw angles to increase as the pellet flies down range. Secondly, as the ratio between the forward velocity and the pellet spin rate changes, it gives increases in gyroscopic stability which causes increased yaw wave lengths, i.e. it takes a longer distance for the pellet to go through a complete wobble which leads to the pellet moving away from its normal trajectory, leading to increased size spirals.
If increases in the pellet spin rate compared to the pellet forward velocity are what seems to be the major cause of problems, the logical answer is to make the spin rate slow down at a faster rate. This can be done in a number of ways, one of which is to add very small strakes to the sides of the pellet flare. A possible design would be like this one shown below, using in this case a JSB 15.9 grain .22 pellet as the basis.
There are four strakes on the pellet shown positioned evenly around the pellet flare. It is possible to estimate the approximate spin damping given by these strakes. No other effects of the strakes were taken into account.
The resulting trajectory for the JSB 15.9 grain .22 pellet with the strakes and with the pellet flaws used in the modelling before are compared to the previous figure for this pellet fired without strakes. There is a large improvement with the almost complete elimination of spiral type behaviour.
The total effect can perhaps best be seen if we look at the trajectories from the back rather than the side view. The diagram below shows the trajectory as seen from behind the shooter.
Since the strakes appeared to work on the 15.9 grain pellet, they were tried on the JSB Heavy pellet in .22 size. The resulting trajectory is shown below. There are still some spirals present, but they are much reduced compared to the same pellet without strakes.
Again, the effect can best be seen from behind the shooter.
These are the same sized strakes as used on the lighter pellet. Larger strakes could give additional spin damping and further reduced spirals.
The strakes modelled are just a first guess at the size needed and to see if it is possible to improve the pellet flight in this way. Much further modelling would be needed to optimize the strake size, position, angle to give fixed spin to forward velocity ratios and total effect. They will also increase the complication in making the pellets, but four strakes should be possible without too much difficulty. Strakes may not be the only way of increasing the spin damping.
As a first look at the possibilities, the strakes seem to show some promise, and the theory of increasing the spin damping appears to give benefits.
The two pellet designs are JSB pellets, not because they have particularly bad problems, but because I happen to have most modelling data on those two. I started with the .177 10.3 grain Heavy pellet with its more cylindrical shape, which in previous studies had shown a tendency to increased yaw angles at longer ranges and higher speeds. I then scaled up the design to .22 to see what happened. The .22 pellet came out at 19.7 grains. I used a muzzle velocity of 950 ft/sec, simply because it seemed a reasonable starting point, and a barrel twist rate of one turn in 16 inches.
The predicted trajectory for the .22 calibre scaled up pellet is shown below.
You can see there is definitely a problem showing up here. A perfect pellet of the same configuration and calibre fired perfectly from a gun will give the flight profile below.
Much better but still with apparent problems at long range.
The next stage is to look if another pellet design acts the same. Data is available for the JSB 15.9 grain .22 pellet, so this one was modelled. The result is shown below with the same initial yaw rate.
The result is predicting much better behaviour, but there is still a tendency towards spiral type problems.
The result for a perfect pellet fired perfectly is shown below.
This round is showing acceptable behaviour.
The accepted way for reducing pellet spiralling at long ranges is to use lower twist rates and a reduced velocity. The improvements can be seen below where the .177 JSB Heavy has been fired at a muzzle velocity of 850 ft/sec from a barrel with a one turn in 32 inches twist rate. Previous trajectories had been modelled with a simple initial yaw rate for simplicity. As a problem had been suggested in the modelling using a simple yaw rate, a more complex system of pellet flaws was used from now on. The first diagram shows the predicted behaviour of a pellet with a CG offset from the pellet centreline and with a flat spot on the front facing part of the nose giving an asymmetry, i.e. a pellet with flaws.
The effects compared to the trajectory of the .22 calibre version at 950 ft/sec, with a 16 inch twist rate barrel and a simpler pellet flaw are much reduced but still present.
Using a perfect pellet with no flaws and a perfect barrel, the trajectory looks like this.
This is probably a usable trajectory, but there still seems to be possible problems as the range increases, and again hoping for a perfect pellet is not a good idea.
The problem with using guns with low twist barrels which are a perfect fit to your choice of pellets, and have lower muzzle velocities, is that changes to the gun are being used to try to solve what is basically a pellet problem. In addition, not everyone can afford a new gun or even a new barrel with the fitting costs, if they do not have the necessary skills or knowledge to do it themselves.
The cause of the problems with the pellets is two fold. One is the lack of dynamic stability, which enables pellet yaw angles to increase as the pellet flies down range. Secondly, as the ratio between the forward velocity and the pellet spin rate changes, it gives increases in gyroscopic stability which causes increased yaw wave lengths, i.e. it takes a longer distance for the pellet to go through a complete wobble which leads to the pellet moving away from its normal trajectory, leading to increased size spirals.
If increases in the pellet spin rate compared to the pellet forward velocity are what seems to be the major cause of problems, the logical answer is to make the spin rate slow down at a faster rate. This can be done in a number of ways, one of which is to add very small strakes to the sides of the pellet flare. A possible design would be like this one shown below, using in this case a JSB 15.9 grain .22 pellet as the basis.
There are four strakes on the pellet shown positioned evenly around the pellet flare. It is possible to estimate the approximate spin damping given by these strakes. No other effects of the strakes were taken into account.
The resulting trajectory for the JSB 15.9 grain .22 pellet with the strakes and with the pellet flaws used in the modelling before are compared to the previous figure for this pellet fired without strakes. There is a large improvement with the almost complete elimination of spiral type behaviour.
The total effect can perhaps best be seen if we look at the trajectories from the back rather than the side view. The diagram below shows the trajectory as seen from behind the shooter.
Since the strakes appeared to work on the 15.9 grain pellet, they were tried on the JSB Heavy pellet in .22 size. The resulting trajectory is shown below. There are still some spirals present, but they are much reduced compared to the same pellet without strakes.
Again, the effect can best be seen from behind the shooter.
These are the same sized strakes as used on the lighter pellet. Larger strakes could give additional spin damping and further reduced spirals.
The strakes modelled are just a first guess at the size needed and to see if it is possible to improve the pellet flight in this way. Much further modelling would be needed to optimize the strake size, position, angle to give fixed spin to forward velocity ratios and total effect. They will also increase the complication in making the pellets, but four strakes should be possible without too much difficulty. Strakes may not be the only way of increasing the spin damping.
As a first look at the possibilities, the strakes seem to show some promise, and the theory of increasing the spin damping appears to give benefits.
Just a fun FYI for those who may have never seen the cockpit of an OPEN / WFTF air rifle.
As in a target rifle used in the competitive game of FIELD TARGET.
Ranging via Parallax which at higher X "depth of field" becomes very shallow and distance easily ascertained. 10-50X power is common in these scope unlimited classes.
Vertical Turret has calibrated distance tape on an oversize turret wheel allowing Click to distance and always aiming crosshair center.
* All adjustments for distance are ALWAYS "UP" having scope zeroed at pellet flight apex. RED ZONE for wrong direction !!!
Bubble level to prevent CANT errors that needs to be watched at all times prior to actual shot.
So just a fun share for those who ever wondered how neurotic some are in the pursuit of Air Gun accuracy
Ranging via Parallax which at higher X "depth of field" becomes very shallow and distance easily ascertained. 10-50X power is common in these scope unlimited classes.
Vertical Turret has calibrated distance tape on an oversize turret wheel allowing Click to distance and always aiming crosshair center.
* All adjustments for distance are ALWAYS "UP" having scope zeroed at pellet flight apex. RED ZONE for wrong direction !!!
Bubble level to prevent CANT errors that needs to be watched at all times prior to actual shot.
So just a fun share for those who ever wondered how neurotic some are in the pursuit of Air Gun accuracy
PCP Rifle SOLD $500 TYD New Tuned Kral Jumbo Tactical
- By thammer
- Member Classifieds
- 12 Replies
New Kral Puncher Jumbo Tactical for sale. Tensioned barrel, enlarged ports, hammer modification and new spring, new delrin poppet with increased return pressure on spring. 425cc 200bar fill. 40 shots at 47fpe average. Chrograph slip and test target at 45 yards shown below. 5 shots with AA 25.4gr pellets. Ships free (CONTUS) in a hard case with the fill adapter and 4 mags. Also includes the UTG shooters bipod. $500 and I cover all fees and shipping. NOW INCLUDES A 500CC 250BAR BOTTLE. 
PCP Rifle SOLD Kalibrgun Springbok 60W (Semi Auto) $1100 *Reduced*
- Member Classifieds
- 2 Replies
.22 Springbok 2 mags fx moderator. Shot very little. Will take 1200 shipped. No trades. Has two nicks in the bottom back of stock. Pictured below 
Targets FOUND Action Armor (formerly Steel Plinkers) Shoot to Reset targets
- By Michael
- Member Classifieds
- 1 Replies
Projectiles SOLD Fx .30 44gr Case
- By Headhunt
- Member Classifieds
- 1 Replies
I have one unopened full case of Fx .30 44gr pellets for sale, case has 6 sealed sets of 5 totaling 30 tins. Can open the case and take pics if serious to buy but it is in excellent condition. Selling case for $415 shipped, PayPal FF works or please pay fees if interested please PM.
PCP Pistol SOLD Zoraki HP01-2 Ultra Multi Pump Pneumatic pistol
- By cmatera
- Member Classifieds
- 0 Replies
In LN condition, comes with everything it came with new. Extras include barrel extension threaded for moderator and an inexpensive red dot sight. $190 shipped CONUS, payment by PP F&F.
maxarmory.com
Zoraki HP 01-2 Ultra .22 Cal Black - Multi-Pump Pneumatic Air Pistol - Default Title - MaxArmory
Our Zoraki HP1 Ultra Multi-Pump Pneumatic Air Pistol is built for extreme accuracy and power. This is the last air pistol you will ever need. Fully a adjustable trigger and sights allow simple, accurate, and safe operation
maxarmory.com 
Compressors NLA GX CS4 Compressor like new very little use
- By Sonny Helms
- Member Classifieds
- 3 Replies
NLA
I have a GX - CS4 Compressor these compressors work great does 5,000 psi fills easily and fast. 400 bar no problem. Will come in origional packaging. 400 Shipped Paypal F&F or you pay paypal fees thank you and have a good day.
No Trades you can contact Sonny @928-848-4969
I have a GX - CS4 Compressor these compressors work great does 5,000 psi fills easily and fast. 400 bar no problem. Will come in origional packaging. 400 Shipped Paypal F&F or you pay paypal fees thank you and have a good day.
No Trades you can contact Sonny @928-848-4969
Possum #3 takes a dirt nap
..it makes sense now why i was losing so many chickens .. theres a whole gang of predators making rounds at my coop at night ... at this point im betting theres even more ..
.. anyway this one dropped hard, luckily, the gun failed to feed after~3 rounds and i had to rack the bolt .. another short burst finished the job ..
.. anyway this one dropped hard, luckily, the gun failed to feed after~3 rounds and i had to rack the bolt .. another short burst finished the job ..
Bipods/Rests SOLD Carbon Fiber Bipod. $50
- By intenseaty22
- Member Classifieds
- 9 Replies
Price is Firm, not accepting offers.
Upgrade Sale. Recently bought an Accu Tac, so I’m passing this one along. Carbon fiber legs, very adjustable, NOT a quick connect.
CONUS $50 PP FF, Apple Pay, Venmo. Shipping included.
Upgrade Sale. Recently bought an Accu Tac, so I’m passing this one along. Carbon fiber legs, very adjustable, NOT a quick connect.
CONUS $50 PP FF, Apple Pay, Venmo. Shipping included.
Crosman Did I break my NEW Limited Edition Crosman 362 ?
- By kaylaindy
- Traditional Airguns
- 11 Replies
I got the 100th annivesary edition. #490 of 2023 made. So beautiful. Williams peep site. Fiber optic front site. Super light weight, yet solid.
It won't pump up. It did at first, but then I :
dry fired it many times filming the trigger
shot it once with the bolt open, it snapped shut
When I sat down to film the shooting portion, the gun would not pump up.
Did I do that?
Are you not supposed to dry fire pump guns?
Like this gun? I posted a thread with alot of close up pics here: https://www.airgunnation.com/thread...man-326-close-up-pics-2023-were-made.1297072/
PCP Rifle SOLD Custom FX Impact Mk2 .25 with extras
- By Sonny Helms
- Member Classifieds
- 0 Replies
Will only ship to lower 48 states
Shoots slugs or pellets. scope not included.
FX Impact MK2
M3 cocking block assembly
M3 power wheel
KL Arca Rail
KL GigaRail
.25 Slug A liner with cf sleeve
Huma high flow transfer port
Huma high flow pellet probe
Orion magazine insert
QD fill probe extension
Comes with a couple of tins of pellets it is tuned for.
It will come with FX case and moderator.
It will also come a .22 Cal Donny that was drilled out for .25 and it is whisper quite and the gun shoots lasers. 1,350 shipped
I also have a GX-E- CS4 Compressor these compressors work great does 5,000 psi fills easily and fast. 350 bar no problem. Will come in origional packaging. 600 Shipped or if you take both Gun and compressor I will do 1,850 shipped..
No Trades you can contact Sonny @928-848-4969
Shoots slugs or pellets. scope not included.
FX Impact MK2
M3 cocking block assembly
M3 power wheel
KL Arca Rail
KL GigaRail
.25 Slug A liner with cf sleeve
Huma high flow transfer port
Huma high flow pellet probe
Orion magazine insert
QD fill probe extension
Comes with a couple of tins of pellets it is tuned for.
It will come with FX case and moderator.
It will also come a .22 Cal Donny that was drilled out for .25 and it is whisper quite and the gun shoots lasers. 1,350 shipped
I also have a GX-E- CS4 Compressor these compressors work great does 5,000 psi fills easily and fast. 350 bar no problem. Will come in origional packaging. 600 Shipped or if you take both Gun and compressor I will do 1,850 shipped..
No Trades you can contact Sonny @928-848-4969
RAW Rapid My first RAW - TM1000
- By Smok3y
- PCP Airguns
- 23 Replies
After 7 years of being in airguns, I have finally picked up my first RAW. Crazy because they have always been one of my top choice for looks and quality. I have mostly steered toward adjustability, so haven’t picked one up… until now.
After selling my Thomas earlier in the year because of a crazy job and not being able to shoot FT like I want and seeing no end in sight, I’m hoping that a recent job change is going to give me more free time. The RAW popped up and I knew I couldn’t let another one pass. This thing is a beauty too and has a lovely 2 stage, 3.5oz trigger. I’m going to have fun!
When I saw it was Rick, a well respected member and FT shooter, I knew I had nothing to be worried about. Quick conversation and two days later, I have TM1000 #5, yes #5, in my hands.
I wasn’t planning for this so fast, so now I need a HFT scope. I can’t even shoot it! I know what I’m looking for now.
I can’t wait to share more as the journey continues, but I was so happy, I had to share.
After selling my Thomas earlier in the year because of a crazy job and not being able to shoot FT like I want and seeing no end in sight, I’m hoping that a recent job change is going to give me more free time. The RAW popped up and I knew I couldn’t let another one pass. This thing is a beauty too and has a lovely 2 stage, 3.5oz trigger. I’m going to have fun!
When I saw it was Rick, a well respected member and FT shooter, I knew I had nothing to be worried about. Quick conversation and two days later, I have TM1000 #5, yes #5, in my hands.
I wasn’t planning for this so fast, so now I need a HFT scope. I can’t even shoot it! I know what I’m looking for now.
I can’t wait to share more as the journey continues, but I was so happy, I had to share.