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Girandoni @ Airgun Revisions

I've read several different accounts of the same gun and I'm wondering if like black powder rifles they were made in different calibers.. I have read 36,42,44&46.. possibly the 44,45&46 are just different ways to measure the same gun.. since my black powder 44 actually has a 45 barrel and uses .454 lead balls..sort of how now big bore airguns are not a common size, you get the airforce texan and it's larger than the similar caliber as the Korean ones..I tend to think that it makes sense to be in a similar caliber as the black powder guns in the time.. I've shot black powder 36 caliber squirrel rifle and 44/45 black powder revolver and 50 caliber black powder rifle.. as far as the rifle went I really shot the 36 caliber more and it was quite accurate.. I also loved the double set trigger.. anyone who has shot double set trigger would understand that.. it's a feature I wish was available on airguns as well.
Mark
The barrel lands are.44 but the grooves are.45. That's the way they Catarized calibers back then.
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Ruger  2013 Ruger Air Hawk Elite

Here’s a couple other useful links.


👍🏼

Hill EC3000 not filling tank

Hi all the compressor was picked up from me in Cornwall on Monday on Tuesday it was I Sheffield at hills on Wednesday it was back with me all repaired and working fine .
All I can tell you about the repair was they replaced seals in the pump anyway you just cannot fault the service turnaround time.
Thanks for everyone's help on this.
Barry
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HW/Weihrauch  Anyone know of a high output tune for HW95/R9 (18-20 FPE)

This data may help.

HW95L Specifications:

HW95L26
Bore Diameter Piston Seal Size (mm)
85 Piston Stroke (mm)45.13 Piston Swept Volume (cc)3x15 Transfer Port x Length (mm)0.106 Transfer Port Volume (cc)426:1 SCR254 Piston
Weight in Grams (g)
SCR = Static Compression Ratio, has little to no meaning for a pellet rifle.

Pellet Rifle Swept Volume formula: Rifle bore radius squared x Pi (3.14159) x piston stroke = cubed mm. Convert to cubed centimeter by moving decimal point 3 positions left.

Example: HW95L .22 caliber 26 mm Bore radius = 13 squared (1/2 diameter) = 169 mm x Pi (3.14159) = 530.929 x HW95L Stroke 85 = 45,128.9 mm cubed. Convert to CC (cubic centimeter) = 45.128 or 45.13 CC for Swept Volume.

Also:
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.
FPE Formula is Pellet weight (gr) x FPS x FPS divided by 450240 or 450436.7.
450240 is 2 x velocity of gravity x 7000, (2 x 32.16 x 7000 = 450240)
450436.7 is 2 x velocity of gravity x 7000, (2 x 32.17405 x 7000 = 450436.7)
The constant 450240 or 450436.7 depends on which value you use for the velocity of gravity.
32.16 ft/s/s or 32.17405 ft/s/s. There are 7000 grains in one pound.
The difference does not matter which ever constant is used for the FPE calculation.
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Ares ETR 3-18x50 vs. the ATACR 4-20x50: Some thoughts

Thanks for the write-up. I think looking through window glass may mute some differences, but so does ambient lighting, light direction, 'target', etc. Doing a thorough scope review is not a trivial thing! I appreciate your honest approach in both testing and reporting. For testing IQ you can make targets with black bars which are spaced progressively closer. At some point the lower IQ scope will be unable to resolve the separation between lines. This is quick and (relatively) easy, and you can do it at varying ranges just by scaling the images. Just try to test all scopes at the same time to eliminate the confounding influences of lighting.

In my opinion, and I have ZERO experience with the Ares, the reason to go with Nightforce is the accuracy over large adjustments, and of course durability. Of course, durability is something we mostly take someone else's word on, as I (and I suspect most) am not willing to drop my scopes nor throw them against the wall. Precise adjustment though is readily tested - even more easily with airguns. Do a search for "scope box test" if you don't know what I'm talking about, then do a box test that is ~80% of the bounds of the scope adjustment range. I certainly can't claim to have tested more than a tiny portion of what's available (and again, nothing from Ares) but the NF scopes have been consistent winners in this regard in my testing.

GsT

Greetings, GsT.

I appreciate the response.

For one, I do understand the problems posed by peering through even a clean window. Again, I did get to look through both of them on that one day unimpeded by the extra factor of window glass. And I will remember the black bar test. I have seen such configurations used on Sniper’s Hide by Glassaholic. I did previously make a rather simple one (only four bars), but your comment on scaling the bar sizes for differences in distance is helpful and will improve anything I do further.

Second, if it were it not for money, I would have gone with the ATACR. Aside from that rotating ocular, it was among the two nicest scopes I have ever handled or looked through. And, come to think of it, I am not fond of the thick outer periphery either, but it is not a stopper for me. Too bad I do not remember enough about the March 4.5-28x52 to compare it to the ATACR. My scope knowledge was far too simplistic then—not that it is so great now, but it has matured. Moreover, from what I recall about the NX8 (probably close to one of my ‘ideal’ scopes for my context and budget), I would like one in either the 2.5-20 or 4-32. But I owned the Ares, it is nice, and so that is that for the moment., and the ATACR went back. The NX8s are a bit lighter than the Ares, too, while I am there.

Third, I assume that with “accuracy over large adjustments” you are talking about tracking, which you comment on right after mentioning this. I am quite familiar with box tests and so on, but it is only the last week or so that I am thinking of doing some tracking testing for myself. I am now very curious as to how different scopes perform, so you are hitting right where I am at with this comment. And yes again, I am aware of NF’s stellar reputation for tracking.

Thanks again. S7 :)

Air Venturi  avenger 22 cal velocities

I haven't posted anything but have read a lot of your posts. I've been playing with my 22 cal Avenger and really enjoying it. I polished the barrel and
stabilized it with centering ring, opened the transfer port in the barrel, added a 19 cc plenum which brought it up to 32 or 33 cc, added a 580 bottle and a donnie Ryu. My last test was with H&N
21.14s which i weighed and sorted. The last group weighed 21.25. Reg set at 2100 HS 21/2 turns 904 fps 1/2 inch group at 40 yards no fliers . Just got some AEA 21.90 to try at the current setting. Also would like to try ths JST dead center 21s and 22s. Has anyone been able to try the new JSB 20. 53 jumbo lights. Keep up the good posts guys, Thanks

7/16/24
just finisned field test on AEA 21.90. Wow, these are some great pellets. Weighed and sorted starting at 22.00, .02, .04 .06. 08, .10, .12. lightest pellet was 21.99 and heaviest was 22.14. Combined the .02 and .04s, 2100 on the reg, 3 turns on the HS, fps 899- 906. multiple groups 1/4 to 3/8 on center at 40 yards. I thing i,ve found my go to pellet. can't wait to try the 25.39s.

Tuning  Tuning and noise

I have tuned a couple and recently bought a used HW50S Hunter with moderator that had been tuned. I could not stand the twang of my new R9, and I was getting dieseling, poor accuracy, and inconstant velocities. So, I ordered a Vortec PG4 kit with piston seal. Turned out the original factory seal was badly burned from the dieseling. Installing the kit got rid of the twang, gave a smoother shot cycle, velocities were very consistent. However it did increase velocities and made the rifle a little more hold sensitive. I agree that downrange the sound isn't that bad. I took my R9 squirrel hunting last week and could hear the smack of the pellet over the sound of the shot cycle. I have shot my HW50S with and without the moderator, and can't tell much difference if I am doing the shooting, but if standing downrange there is a noticeable difference.

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