This week I have been revisiting my ss and playing with getting it to shoot 25 grain at about 900-925 fps . I feel I have it where I want it now but in the process of doing it I had to take a lot of shots and I'm noticing my ears are ringing. The gun isn't very loud at all but I think when the hammer slaps the tank it makes a strange ping noise....has this bothered any of you in the hearing dept???

Looking to sell my Panthera 22 cal 700mm.
comes with factory mag and 1 Orion mag.
have two Saber Tatical weights on the barrel.
Has the 910 PinPoint trigger blade installed.
purchased a few months back.
Just don't use it in the PRS like I thought, cuz of time restrictions.


Tuned to shoot 34g H &N .217 very well.
$1800 split the shipping cost. Lower 48 only.
Can work out the payment options, PP, Venmo, ect

Not looking for any trades at this time.
Does not include scope.

Thanks

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Have asked the ? before ,do everyone have to re log in every time you use the forum? I do!! Cheers Mal.

Only has two useable shots. I keep one in the tube. I've been being sloppy and tossing an extra pellet in the pistol case, and it keeps going missing. Trying to brainstorm ideas for something to hold one pellet on the gun.

Lets take my .25 cal marauder for example, it sports a 19.5" barrel, .225" ports and 53 cc plenum @ 2100~ psi. All the graphs shown are with 33.9 gr.

What happens with various barrel lengths at plateau power? Well for one, if you chop the Marauder barrel in half, it will output basically half the energy, if you double the barrel, it would nearly double the energy, with the right weight projectile, or if you add 10% barrel length, you will add nearly 10% energy potential to the system. This wouldn't come for free, and you would need to dwell and keep the valve open nearly twice as long to get twice the air into a system with twice the barrel of course to obtain twice the energy...

So when someone asks, how many fps will 1" of barrel add? Well that depends on your existing barrel length! For a 10" barrel, 10% FPE, for a 20" barrel, 5% FPE, then you can determine your velocity/fps increase based on that. Clearly adding 1" to a 6" barrel increases FPS a lot more than adding 1" to a 28" barrel.




What happens with various port sizes? Well if I half my port size from .225 down to .1125, I would get half the power at plateau...same applies in reverse, you double power output. 10% increase/decrease should relate closely to a 10% change in energy. Likewise you would use more air as power increases, or less as it decreases at plateau as you're expending more or less appreciable air behind the pellet before it exits the muzzle, provided you adjust your hammer strike. Largest port possible closest to bore diameter allows the shortest dwell time possible in a system as the lift generated to expel for example 1000 mg of air through a .25" equal port for a .25 cal takes less time than that of a .2" equal port or less, thereby increasing dwell time / the pressure pulse making it less efficient than a system with larger porting closer to bore diameter.

vs


Half the pressure? Half the power!

vs


All this to say, energy increase is fairly linear with Pressure, Barrel Length changes, and Port sizing changes until you reach limitations placed by physics, be it speed of sound, or otherwise, such as exceeding the diameter of bore on air flow path, or exceeding regulator setting/fill pressure. However doubling the caliber would provide closer to 4x the power increase if you're on the hunt for power.



And projectile weight where power stops increasing once pellet weight is 1/2 the FPE in grains and velocity is 950~ fps. This can be seen middle of chart.




And of course, plenum changing alone...



Where the graph goes off the chart its flat and shows no real gains to be had, beyond 3 fpe/ci shows no real gains for a pcp's air delivery system, however a good sweet spot for max power is a bit over 1 fpe/ci with a good workable range being .4 fpe/ci to 1.6 fpe/ci. One could supplement smaller plenum volumes with increases pressure by that is not the point of this discussion as one could simply run longer barrels as well, or larger ports, it all provides more energy if plenum volume won't get you there, unless you want to max everything out, then you should be at your max regulator setting anyhow and that discussion is moot. Hope this helps some tinkers out there understand changes they can or have made to their airguns.


Regulator refresh rate? Oh ya, theres that too...it effects your pressure during the shot cycle!


-Matt

This started out as a Crosman 2240 it has a upgrade valve barrow, adjustable, hammer, spring still breach the 2240 b CO2 tube maybe more I just forgot also comes with a short barrel and pistol grips covers also CO2’s it is shooting the low 500 ft./s depending on the weather because it is CO2 very accurate also comes with scope 180 tyd

0.25cal Currently at 130/90 pushing 35ft/lbs or so. PW at 1, adjustment cw all the way in.

Trying to back out the power even more! Anyway to get it down to 30 or even 25 ft lb? For mouse fart squirrelling out to 15 yards max

What’s everyone’s favorite “budget friendly” bipod? I got the utg above bore bipod and I’m not a real big fan of it.

Thinking about putting my evanix k550 22cal but for trade.. get gun but I'm bored with it... I made a carbon fiber shroud for it (no I don't have the original) this woulds great and looks good.. it has a Donnyfl adapter... Let me know what you got...

I put together a Crosman 2260 that I moved over to PC using the SafePak adapter. I have a 13ci bottle on it and the regulator is set for roughly 1500 psig. I had my son hand pump the tank to around 2500 today and I took it out to shoot it. It's a 20 cal using a Lothar Walther barrel that was a CO2 gun in it's previous life. Very accurate. I'm using the H&N 13.6 grain Barracudas. A previous testing session before I had the gun all together was giving me around 860 FPS. I did not use the chrony today because of weather conditions. The valve is your standard 2400 that is using a bit lighter spring and I have the ports opened up and the valve exit has been angled up. I've also changed the cocking from the little pin thing to a pull back handle threaded directly into the hammer. I have different brass weights that I can use to alter the hammer strike. I have a stronger hammer spring in the rifle also.

Today was a test to see how many shots I could get from a bottle-indicated 2500 psig until I reached the regulator drop off at around the 1500 psig mark. I had probably 40 shots out of it and the bottle gauge was showing around 1000 psig. I was seeing no difference in POI from my first shot to the later shots when the bottle was clearly below the regulated output. I was also getting some of the burping noise with each shot.

So the question is, since I'm still seeing shots with the bottle showing the drop below the regulated pressure that are apparently still at the same kind of velocities that I had when the regulator was at it's 1500 psig reg point, I guess that I am not getting the full pop out of the valve, right? Could need more hammer hit but am I thinking right about this? Next test will be with the chrony to get at the actual velocities across the string as I watch the bottle. I'm going to get the GX CS2 compressor in the next week or so to keep from using the hand pump. Any tips or advice or anything you can think of would be appreciated. This is a fun project! I'll have to post a pic of the thing. Looks right out of "Mad Max".

Tony

WTS...22 -- .25 moderator $90 shipped 3 day priority..PayPal ff or add the fees..

This is just a feeler but looking to trade my custom Ernest Crown. This was his personal rifle that I bought of him. It has a custom 310mm barrel with a carbon fiber tension system which I than had izzy at donny make a custom end cap to keep it in place so you can keep tension and remove the moderator. It is in a Saber chassis and is a .22. It's currently set up for 17fpe as a backyard buster shooting the hades. I am looking for a evol mini or regular in the same .22 caliber. It can come with a 480cc bottle. Just a feeler but let me know. No scope, and can add the plano hard case for a fee if needed. Any questions feel free to ask. Not sure what i want but open to .22 trades other wise $1600TYD

Did the Epoch Skout just come down In price ? I mean by over $600 , or am I missing something .

Fire Arms seized in a raid.

how good in this guaranty ? does it cover any scope ? posting here because i need a quick answer .

Recently picked up a pre-owned HW30 that's dead nuts accurate, but potentially shooting on the low side. With CPHP's I picked up the following ten FPS readings:
452.1 | 472.4
444.0 | 457.6
421.0 | 465.2
422.2 | 492.4
460.0 | 488.4

Is this a little anemic for the platform?

I just unboxed and inspected these two beauty's that came my way unexpectedly easy (found late one day made contact next day payed and shipped next day)...An SLR98 .22 carbine and an Elinimator .20 cal. both from the original owner with all paper work and documentation, three mags included with the SLR...Both shipped with Leupold vintage EFR scopes 3x9x33 on the SLR and 6.5x20x40 on the Eliminator....that one was removed for shipping...I haven't seen any dings or scratches yet just minor hand polishing on both...just awesome virginal guns still running original tune...nether have ever been run over a crony or opened...The owner insists they haven't lost a thing in 19 years. The original owner said he tried to sell them to some "big airgun companies" who weren't interested in the least...but he found me...and I WAS interested...nice gentleman not in the airgunning community and just wanted someone to take care of his airguns he took such good care of over the years. I just wanted the SLR but after seeing the stock on this Eliminator...WOW!...Guess there is still some good ones out there in the wild yet just have to find 'em...

I have read conflicting reports that slugs work as well or better than pellets with head shots, or that they don't have the penetration ability as a pellet does. Now this may be due to caliber. Possibly a large hollow point at the nose of the slug while great for expansion, not to good for thicker skull. Body shots are undisputed. My curiosity is with limits due to caliber and hollow point size. Obviously a 177 at a large pig is not recommended , just as a 65g slug at 900 FPS is not intended for a chipmunk! LOL! Seriously though, what kind of penetration results have you attained with slugs versus pellet counterparts? I would conduct these tests myself, but I lack a private range.

Hello fellow airgun enthusiasts. I’m debating between the original Uragan .30 and the Uragan 2 in .30. There’s another thread on here of the sort but there wasn’t a lot there. Hoping enough time has gone by that folks have had some experiences with their Uragan 2’s.
Anyone have both the original Uragan and the Uragan 2 (600mm) and can say anything about the performance differences between the two?
I do recall when the Uragan 2 hit the market there was a bit of a supply problem with barrels and I believe there were some complaints about the .30 barrel’s performance. Seems like the rumor was that the .30’s weren’t actually CZ barrels or something...
Has that been resolved?
Am I better off buying the original? I like the plain walnut stocks so the laminate doesn’t really factor in to me anyway.
I have the Uragan King and it has phenomenal accuracy with the 44gr JSB’s. Hoping for more of the same from a single tank Uragan.

Im looking for a basic, even VP model fx crown without a barrel or probe if possible. Used is fine just not modified and beat up. I have my own barrels id like to put into one so no barrel needed or any caliber is welcome. Im looking for cheap here, and I have seen some great deals come thru on great setup crowns with lots of extras.
Thanks

I am selling a MCT Viper Pro 5-30x50 in great condition P/P F/F $275 to your door, I am open for offices all I can say is no 48 state only
No trade at this time I will post pictures soon

Selling my custom prod. Stock from Tom West, larger transfer port, new hammer spring and 16 inch Lothar Walther barrel. Shooting 18 grain JSB pellets around 890 fps. Comes with all the original parts, and a tactical set up from buck rail. Bipod included. Asking 600 obo shipped conus. 3305902221 for more info and pics on request.

You have nightmares about them! The rest of my dream was vague but I clearly remember being handed my old Diana 48. I pull the trigger thinking a pellet was in there. Except there was NO PELLET! No joke I woke up with a feeling of disappointment that I had dry fired my springer.