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USFT  MAC1 for Bench rest

@woogie_man - seriously i have this USFT'S little brother listed for sale in the classifieds right now... <12 ft lb regulated tube version but easily converts to < 20 with the know how.
I did see that, though would have to sell one of the rifles to get her! Would have to let go of the anschutz 8002 to justify another buy. Already have Martin building me another Rapid....so my fun money is tight. Lol

So if you know anyone that want a 20ftlb Anschutz 8002 let me know! 😆
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Garmin Chronograph

I use the
https://www.caldwellshooting.com/ra...tic-precision-chronograph/720001.html#start=1 chrono and just jot down the shot FPS #s as I don't even use the iPhone app anymore. I use an excel APP with my WIN 11 PC which gives all of the data I need after I input the FPS & pellet weight. I don't use it with my PB rifles as it they make no difference to me as long as they shoot. The Caldwell has been excellent without many errors. I use the data as a bench mark to know when my air rifle needs maintenance/checking. APP example.
Pellet Rifle performance data results (1/09/2023)
Shot NumberPellet Weight (Grain)Speed (FPS)Speed (MPS)FPE (450240)FPE (450436.7)JoulesRange (FPS)
114.66720.0219.516.8816.8722.88720 Low
214.66724.0220.717.0717.0623.14725 High
314.66722.0220.116.9716.9723.01
414.66722.0220.116.9716.9723.01
514.66723.0220.417.0217.0123.08
614.66721.0219.816.9316.9222.95
714.66725.0221.017.1117.1123.20
814.66720.0219.516.8816.8722.88
914.66721.0219.816.9316.9222.95
1014.66720.0219.516.8816.8722.88
Mean ValuesGrain
14.66
FPS
721.8
MPS
220.00464
16.9616.9623.0Spread
5
FPS = Feet Per Second, MPS = Meters Per Second, FPE = Foot Pounds of Energy.
To convert to Joules multiply FPE by 1.3558, Joules to FPE multiply by .7376
To convert MPS to FPS, MPS x 3.2808399 = FPS .
To convert FPS to MPS, FPS x .3048 = MPS.

Pellets and slugs

Biggest slug here i assume is the " forrest slug " they can reach sizes where you see a big one you might think " OMG someone took a dump here "
The problem though is a smaller newcomer slug to these here parts, they slither around and make a mess of peoples gardens.

One good thing we found out in the old days, your garden railway with track power, well even if its not HUGE power, those will fry slugs just fine.
Track power though, not really worth it, even if you have a severe slug problem,,,,, an excuse to build more garden railway instead.
A heavy liner is a must with the forrest slug.

PORTABLE SHOOTING BENCH VER III

Addendum: Ver III
PORTABLE SHOOTING BENCH PROJECT

I applied some light Stain to the finish on the Portable Shooting Bench along with several coats of English-Wax. I also added some Vinyl to reduce friction and make a non-skid surface for the Machine Rest and Rear Bags.

A few more tweaks and I will call it quits.

Today the Marauder performed very well at 25 Yards. At the fourth target, it produced a (5 Shot) .404" group. I tried it on the Steel at 100 yards and it was about 7" low. Still plenty of power, the pellets were destroyed.

I believe I can get hooked on this PCP stuff.

Don

ATTACHED: 4 Place Target Frame.

View attachment 447045

View attachment 447046
The table is impressive! The Marauder is an excellent PCP with a simple build, which means fewer things can malfunction, and it also offers a great shooting experience.

N/A  What's your favorite compact PCP?

View attachment 471709

My short compact preference are these 2 lol . the leshiy classic sometimes wears a holo sun cqb red dot as well with a chevron . I like to keep things 40 and under with these rigs . Your mileage may vary haha.
What kind of results are you getting from the FX and how short is that barrel?

Arizona State spring piston championship match report from Phoenix, AZ - March 16, 2024

Lane 1 was a SERIOUS head scratcher. The 8-12feet high bushes right there to the left were shaking like crazy. The 6-12inch weeds right at the target were also dancing around in the wind. But holding up the string gave absolutely zero indication to which direction all of that wind was going. The string was a perfectly dipped parabola, downward, as if nothing but gravity was affecting it. It was crazy.
Hahahahahaha........! Oh, yes! Welcome to BASF and the squirrely winds that seem to never let up. And to think, we shoot in those conditions every Tuesday morning, year round, with our TRAC matches. Last week, we had 17 shooters, for a weekday match! You should see what it is like when the wind really blows. A great exercise in wind reading, with some pretty darn good scores being shot, as well. It is more like a test tube, not a flat parking lot.

Ninja 90 EZ PCP Fill station Protective covers?

Gerry, yes I did and found a bunch of options. Thanks. Not sure what I searched before hah. My bottle thanks you.

F6Hawk I think that wet suit is a bit large for my bottle :)
They are cheap, used wetsuits. Cut off the appropriate part of an arm or a leg, and you have a neoprene cover. Several, if you do it right!
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Air Venturi  Avenger Barrel Alignment

It's been a couple of weeks, but I got the gun back after they replaced the barrel and shroud. After recentering my scopes, I put one of them on the gun and dialed it in. The groups aren't as tight as they were with the old barrel, but that is something for me to work on. I'm very happy with my Avenger and the service I received from Pyramyd Air. (y)

Airgun Technologies  Sizing Vulcan 3 .30

Strange results from sizing.. The .306 pain to load and not the best velocity... The .305 seems to be the best and most even velocity of all 3.. The .304 falling off..
I figured the .306 would be the best by the chrono, seems I was wrong.. The best seems to be the .305 !! This is starting at 230 bar..
Name: 306
Notes: 241
Shots: 18
Average: 919 ft/s
SD: 55 ft/s
Min: 816 ft/s
Max: 979 ft/s
Spread: 163 ft/s
Power Factor Average: 59
Power Factor Low: 53
Power Factor High: 63
Barometric Pressure: 29 in Hg
Temperature: 69F
Bullet Weight: 65

Name: 305
Shots: 18
Average: 972 ft/s
SD: 11 ft/s
Min: 952 ft/s
Max: 991 ft/s
Spread: 39 ft/s
Power Factor Average: 63
Power Factor Low: 61
Power Factor High: 64
Barometric Pressure: 29 in Hg
Temperature: 70F
Bullet Weight: 65
Strange results from sizing.. The .306 pain to load and not the best velocity... The .305 seems to be the best and most even velocity of all 3.. The .304 falling off..
I figured the .306 would be the best by the chrono, seems I was wrong.. The best seems to be the .305 !! This is starting at 230 bar..
Name: 306
Notes: 241
Shots: 18
Average: 919 ft/s
SD: 55 ft/s
Min: 816 ft/s
Max: 979 ft/s
Spread: 163 ft/s
Power Factor Average: 59
Power Factor Low: 53
Power Factor High: 63
Barometric Pressure: 29 in Hg
Temperature: 69F
Bullet Weight: 65

Name: 305
Shots: 18
Average: 972 ft/s
SD: 11 ft/s
Min: 952 ft/s
Max: 991 ft/s
Spread: 39 ft/s
Power Factor Average: 63
Power Factor Low: 61
Power Factor High: 64
Barometric Pressure: 29 in Hg
Temperature: 70F
Bullet Weight: 65
Need to adjust hammer spring tension, spreads are too big. Will help tighten up groups as well. Here's spreads I'm getting with 60gn Hollow Point .307 caliber (tad oversized) made on my Thor Press. Set up chrono at muzzle and then at 100 yards

Muzzle Velocity.png


100 yd velocity.png

My GX CS4-I

Kudos to @Humdinger for compiling multiple posts about air tank sizes, volumes, as well as air volume. Since I think so highly of his efforts, I am re-posting them here in case anyone searches for AIR TANK VOLUME or SCBA TANK SIZE, or 88 CU FT or 97 CU FT or 9L. (The first two parts are his, the last is mine. All in an effort to reduce confusion as to SCBA air tank sizing)


1714084365600.png


Code:
GX factory literature rates the GX4 and GX4-1 air output rating at 11 liters per minute at 1 bar. That equates to 22 liters per hour @ 4500 psi or 310 bar.

Most owners fill their SCBA tanks to 310 bar. That means a 6.8 liter tank X 310 bar holds 2108 liters of air @ 4500 psi. It takes 3 hours 12 minutes to fill a 6.8 liter tank from 0 to 4500 psi using the factory advertised fill rate.

A 9 liter tank holds 2790 liters of air at 310 bar or 4500 psi. That means using the factory rated output of 11 liters per minute it takes 4 hours and 13 minutes to fill a 9 liter tank from 0 to 4500 psi using a GX CS4.

A 500cc cylinder holds 125 liters at 250 bar. Filling a 500cc PCP air cylinder to 250 bar takes 11 minutes 22 seconds from empty.

Output air filters and other variables may affect these fill times slightly but this gives a general idea of the fill rates for this compressor.

Code:
SCBA tank terms are bandied about that can be confusing and rather inaccurate. There is technically no such thing as an 88/97/100 cu ft SCBA tank, though those (marketing/advertising) terms are commonly used (and confusing for people, old pros and newcomers alike). Some also refer to SCBA tanks by their breathing time (which makes zero sense for us, since we aren't firefighters, and time is irrelevant, since it all comes down to one's lung capacity and level of exertion).

Four common sizes of SCBA tanks (yes, there are several more, depending on whom makes the tank) are below. The first two values are actual WATER VOLUME measurements, and are actually the best way to compare sizes, since water isn't compressible, and air is. The other two are kind of thrown about with less precision by various groups:

114 cu in (1.9L) <20 cu ft> <15 minutes?>
285 cu in (4.7L) <45 cu ft> <30 minutes> Actually holds 1,457 L (51 ft^3) of air @310 bar.
410 (6.7L) < 60/73 cu ft> <45 minutes> Actually holds 2,077 L ( of air @ 310 bar; 1,675 L (59 ft^3) of air @250 bar.
550 cu in (9L) <88/95/97 cu ft> <60 minutes> Actually holds 2,790 L (98.6ft^3) of air @310 bar, 2,700 L (95.3 ft^3) of air @300 bar (you get the idea).

The reason for the various cu ft numbers is because air is compressible, so depending on pressure, one can have more or less of an air volume.

GX CS4 - how big is the hole for the rubber gasket in the grease pot?

You'll know when it's getting grease. If you haven't done so yet, make sure the grease pot doesn't have a large cavity of air in it (they typically do from the factory). I re-packed mine the day I got it, took about 20 turns of the knob to get the grease to come to the edge of the pot. The second pic is another 10 turns, and were was still room left to keep turning it.

I'd level yours off, back it off about 5-6 turns, then with the machine running (and assuming it is time to grease the cylinder), turn the knob a turn at a time until you feel some resistance. That's the grease not wanting to go thru the hole. At that point, you'll know you are actually pushing grease in.

From the factory:
View attachment 446696

After about 30 turns of the knob:
View attachment 446697


After leveling the grease in the pot

View attachment 446698

I figured that if it wasn't the gasket (not passing grease), it might an air pocket.

I'll just repack it and keep turning that grease knob until I hear the sound change.

Once again, thanks for all the help!

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