Threads

JimBentley · Feb 7, 2024

It would be interesting to see what the accuracy of the lighter one are like.

Magnum12 · Jan 20, 2024

Thank you Admins for the opportunity to participate in the giveaway....much appreciated.....Thank You Again!!!!

Ctkny · Jan 20, 2024

Garmin xero with grayops mount. $625 shipped usps priority with tracking, paypal Friends and family or you add the fees

MOhunter · Jan 20, 2024

Hello everyone. I'm in the market for a Meopta MeoPro Optika 6 scope FFP, in 3-18, 30mm tube with the BDC reticle. Item 653561. Thanks.

jakeb · Jan 24, 2024

orangeokie said:
In my experience, I have never experienced a shortage or availability issue with Benjamin magazines for the Prod or Mrod. Like was already posted, the Prod and Mrod mags are not interchangeable.

Had some leftover Avenger mags laying around after selling my Avenger. Slightly altered, they work great in my P-Rod! I hate waste and enjoy useful tinkering.

weevil · Jan 22, 2024

qball said:
Gotta love nerdy threads like this. According to Boyle's Law the equation to get the volume of air it seems to be linear based on pressure.

Volume of free gas in a Storage Volume
The amount of free gas at atmospheric pressure in a given volume - like a cylinder storage - can be calculated my modifying (1)

V a = p c V c / p a

p a = atmospheric pressure (14.7 psia, 101.325 kPa )
V a = volume of the gas at atmospheric pressure (cubic feet, m 3 )
p c = pressure after compression (psi, kPa )
V c = volume of gas after compression (cubic feet, m 3 )

So filling that pistol to very high pressure/5000psi does make the shot count look very reasonable or doable under normal efficiency.

My question is: how da hell does anyone fill it up to 5000 psi? Hand pump?

There is also a Z factor in the equation to account for variation in temperature and pressure:

Compressibility factor - Wikipedia

en.m.wikipedia.org

Practically speaking, at the temperature we operate at, air is 3% less compressible at 200 bar, but that rises to 10% at 300 bar and 14% at 350bar.

So, at 300bar, 1 liter of air contains 270 liters of air at atmospheric pressure.

Triglav · Jan 24, 2024

Bernie7 said:
First off to OP, the guy who responded here @Ballisticboy truly knows his poop. My comment was a best guess and somewhat ironically based on the article he linked (having read it awhile ago) which I guess demonstrates I didn’t read it carefully enough

Although to be sure, @Ballisticboy when you say “at the speeds you are talking of” do you mean what the OPs estimate is or what I posted and believe is a much more accurate assessment based on manufacturer’s data? The device listed is powered from a 12g CO2 cartridge (~850psi) and has a 4.25” barrel. Even at the low end of his estimate @ 1100 fps, that would give ~56 fpe, which would put it on par with a GK1 fired at ~3600psi through a longer barrel and at a heavier weight.

Bernie7 said:
If there was a video where someone shot these projectiles out of a CO2 power pistol and chronographed them? And yes, ideally if they specifically used the T4E..

I found a video where they fire solid steel slugs

Jump to 7:50 to see the chrono results, I believe he also has a custom built barrel extension.

Maybe @Ballisticboy can chime in but I’ve found it appears that adding mass to a projectile increases energy given all other factors remain constant. I’m sure there’s a break even point though where it starts to work in reverse where the pressure is insufficient to even get the projectile to leave the barrel or due to additional friction from more surface area touching the bore so even if the energy was technically equivalent or greater it wouldn’t actually serve a practical purpose. Once again I’m theorizing based off personal experience and limited knowledge, hopefully an expert can provide an answer.

You're exactly right about this, your personal experience didn't fail you! Once either a barrel gets too long, or the projectile too heavy, the muzzle velocity and with that muzzle energy/power starts to go down, due to a variety of factors - i.e. backpresure, gas expansion threshold, friction of the projectile... et cetera. I know this for certain, but with CO2 there's something else at play, and that's the fact that the greater the caliber is, the more effect the gas will have on the expansion of pressure - that's also in regard to the material of which the barrel is made; Copper and brass work best for adding to backpressure.

By the way, the extended barrel mod on that HDR in called the XTender.

Hw9720 · Jan 20, 2024

NIB Aim 10-40x56mm Side Focus AO Scope. Has 30mm body and large side wheel for the AO. Scope is lighted and comes with rings. Flip up lens covers.
110.00 shipped paypal F&F
tim

Vetmx · Jan 20, 2024

I’ve had the delayed post thing happen a couple times. I figured that’s what you were dealing with when I saw you running two topics. It was my device. It needed a cleansing. Thinking and posting freely on this forum should never be a problem unless you just get plain old nasty or keep causing a ruckus. Actually it seems like the people who want a let’s all stroke each other type of forum are the only ones in pain and agony. Free speakers keep things interesting and have interesting stuff to talk about. Stay your course.

Pruitt58 · Feb 18, 2024

This listing has been renewed

robster01 · Jan 24, 2024

High Presuure Pneumatics (HPP) has the DRS synthetic classic and walnut on their site for preorder. 500mm - 600mm synthetic for $1K and Walnut for $1150. The MTD version will not be out until another month or so based on the HPP IG post. Just thought this was interesting since so many were wondering including me.

hussn32 · Jan 20, 2024

Looking for a used Arken sh4 gen 2 4-16x50 scope. Message me if you have one. I only use PayPal and I am in nc . So pics and price shipped to nc. Thanks

beerthief · Jan 20, 2024

Yes it happens to me also ,but i know it is my connection (i have a icon in the corner bottom of my screen ,tells me signal strength . )
P.S. i have fiber optic cable and very high speed service .

KWK · Jan 20, 2024

I believe Giffard was first in 1867. Quite a bit earlier than their CO2 rifle. And a very beautiful rifle it was.

Max115 · Feb 17, 2024

Found it, but website says no shipping outside of the US. Waiting for email reply. Thank you for the info rdpjr6504.

rcs9250 · Jan 20, 2024

Cool. The local gunstore has one of those with laser pistols and rifles. Several targets are moving to make it a challenge.
This winter I hope to make a couple squirrel feeders I can bungee to a tree quickly, then sit and wait. And maybe make a cradle for my Air Venturi SCBA.

Kenjeepman · Thursday at 10:06 PM

So i noticed the latest closing valve is tapered on the bottom. I did install it and dry shot once and then it dumped on the next shot. I am wondering now installing it without the washer ??

rcs9250 · Jan 20, 2024

A.G.R said:
Really! Someone posts a nice video of a USA MADE PRODUCT THAT HAS FOREVER WARANTY ,NO QUESTIONS ASKED ..and the best you can say is that it was poor video because they didnt show proprietary operations

Im sure in your vast manufacturing you openly shared your company’s methods

Maybe it’s why your not living it ..

You can misinterpret that any way you want. Had nothing to do with Burris. The youtuber “expert” and his poor research into something he knows nothing about is what the post is about. I’m still not allowed to talk about many manufacturing proprietary secrets I worked with and never will.

air-hunter_canyon · Jan 19, 2024

Good day,

I am listing my fx m3 700mm .22 sniper edition in bronze for sale.
PRICE $1700 PLEASE PM ME
This is what you will receive to your door upon purchase:

1 x FX IMPACT M3 700MM W/580CC BOTTLE INSTALLED
1 X SLUG LINER ALREADY INSTALLED
1 X CARBON FIBER SLEEVE (NOT GLUED) (INSTALLED)
1 X DONNY FL MODERATOR
1 X ORION .22 Magazine
1 X FX HARDCASE
1 x Heavy Hammer (Installed)

Devink · Jan 27, 2024

This listing has been renewed

Lewis · Jun 28, 2024

I just bought 5 more of them. I can't find anything else in the price range that is as good. I hear good things about the Discovery 5-30 PRS gen II. They are even cheaper at 350 on Amazon. The deal breaker for me is the 25 yard minimum parallax.

Bigragu · Jan 19, 2024

Looking for an FX STX liner, 30 caliber, 600mm, and must have a twist rate of 1:22.
If you have one you don’t need give me a shout- thank you

FOUND- THANK YOU, CM!!

cavedweller · May 30, 2024

NINCO1 said:
I just read Centercut’s background info and suggestions. That’s very helpful and great info and instructions as to how to lock in the your best accuracy and understand the limitations that will affect your shots. But here come the “but” …..I fully understand the fun, excitement, success and frustration of tuning a new rifle…. I’ve done it for more years than I care to talk about ….BUT, in order to prevent waisting loads of ammo setting up, how do I know where to start with lets say a 29gr NSA .218, or a 17.5gr .2165 with this shooting computer? That’s where info from others could help new Alpha/Delta owners with basic tuning starting points.

@NINCO1 to elaborate a little better - pick the pellet weight in factory mode closest to your slug weight. Pick the highest speed in the ractory modes onboard computer that it will allow you - if you have a known stable speed for that particular slug start there; maybe even - WARP ? Then let the computer figure it out and see what happens.

markhooper · Jan 26, 2024

AirNGasman said:
View attachment 429147

Although I don't have an extra AP16 Compact pistol laying around collecting dust, I do have an AP16 Compact barrel, shroud and chamber-tube laying around in a case, for when I want to play with my AP that way. Yes, you can remove and install charged chamber-tubes, then all it takes to complete the conversion is loosening two barrel set-screws to swap the barrels. Very quick and easy transitions.

.

oh.. that sounds great.. now to kick myself again for not buying one when they were still available..
thank you for the pictures.. even if I can't have one, I enjoy seeing them.
Mark

JimD · Jan 21, 2024

If you want to consider some less expensive guns you might look at a Snowpeak (SPA) P35 or Stoeger bullshark or SPA M60b. The first two are available in 25 caliber and the M60b is also available in 30 and 35 caliber. Airgun Archery Fun has the M60b and Krale has both that gun and P35s. You can get the Stoeger from Amazon and others. I have 3 P35s and really like them. Light (5 lbs unscoped), short (under 30 inches) and reasonably powerful (my 25 is just under 50 ft lbs). My P35-22 has given me one 200 on the 30 yard challenge so they are pretty accurate too (my other two have shot over 190).

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