I have seen some people claim they can get over 1000fps out of a modded 2240. I dont have a chrony but I have done some valve mods and bolt mods and I know that it does not have nearly as much power as my .22 npss which I'm pretty sure is not shooting 1000fps so I was just wondering what kind of power can I really expect from a modded 2240?
Its not hard to get 20 fpe with a 2240. Course thats probably not gonna happen without an HPA conversion. Personally my best power from a 22xx gun was about 28 fpe. I have know folks to get in the mid 40 fpe range, but were talking about serious modifying.
The biggest limit with a 2240 is barrel length, the second biggest limit is CO2.... Put a 24" barrel on it, a few mods, run it on HPA, and it becomes a Disco.... I have modded a Disco to 53 FPE in .22 cal, over 100 FPE in .25 cal, and 133 FPE in 9mm.... If you're talking a shorter barrel and leaving it on CO2, then give your head a shake, it ain't gonna happen.... Bob
Its not hard to increase power to the levels i mentioned. 20 fpe is simple with a barrel, valve and breech/bolt swap. Slap a hipac on about 1500 ish psi and you should be somewhere between 15-20 fpe. A power adjuster will make tuning fairly easy.I would probably called foul on 30-40 fpe claims to, until I went over to the CAPOF forum. Those guys are wizards at what they can do with the lowely 22XX gun.For the record I have modded no less then 20 of these guns, its great fun. This one I cal Frankengun. I have more cash in it then id like to admit, but then again the fun of it was building MY gun Currently its setup to get about 130 shots at roughly 13 fpe. This is another one of my contraptions. This was a 2240 that I added an mrod trigger, 24" barrel, TKO, Boss valve. You cannot see it in this pic but its powered by a Hipac at about 1800 PSI. She shot at about 28 fpe and would regularly shoot under 1/2" at 50 yards.Dave
So I guess with a HiPac conversion you can comfortably use a more powerful hammer spring as there's no valve pin having to ram into a CO2 cartridge and potentially get stuck? What relationship does the hammer even have with a HiPac after conversion? How does it all work exactly?Another thing, what caliber and what grain of pellet are you guys using to get such high foot-poundage out of your guns? You know I used to think that FPE was the primary calculation of power in airguns, but have since come to think that in fact muzzle velocity and pellet grain are the primary factors, and FPE is kind of just like a by-product that is the result of those two properties working in cohesion.
That's exactly what FPE is. In my opinion, FPS is important. Too low (like the Canadian limit of 500 fps) and you've got a rainbow trajectory that makes hitting way out there quite a feat. FPS at a reasonable level gives you a relatively flat shooting rifle that allows you to "reach out and touch something". If you can keep the FPS up while launching a heavier pellet then you're also going to be able to touch something effectively. There are those who favor light pellets to keep the FPS up to astonishing levels. But a light pellet won't carry as far as a heavy one since it doesn't have the mass to keep up the momentum, This is why I'm fascinated with the Korean and Turkish guns. They get high velocity out of regular pellets - and can get decent velocity out of cast projectiles. This allows you to have a flat (relatively) trajectory while transmitting amazing power at the target. FPE doesn't tell as much (to my mind) as FPS and pellet weight. Theoretically you can drive a 7 grain pellet to 1,134.2 FPS and obtain 20 FPE. 1,035.37 fps will give you the same FPE from an 8.4 grain pellet. Now let's reach up a bit higher for 30 FPE and you'll drive the same 8.4 gr pellet to 1,268.07 and 1,389.1 with the 7 grain. At those speeds you can pretty much kiss accuracy goodbye. If you kick the pellet weight up to 15 grains, however, you only have to drive it to 948.94 to reach 30 FPE. You've got the FPE while keeping your projectile within the generally accepted velocity for accuracy. A Canadian would have to launch a 55 grain projectile at 495.57 to reach 30 FPE and stay under their 500 FPS velocity for a non PAL rifle. Of course, the minute they test that rifle with a light pellet - he's busted for having an illegal weapon.
Quote from: AmBraCol on June 26, 2013, 10:18:06 AMThat's exactly what FPE is. In my opinion, FPS is important. Too low (like the Canadian limit of 500 fps) and you've got a rainbow trajectory that makes hitting way out there quite a feat. FPS at a reasonable level gives you a relatively flat shooting rifle that allows you to "reach out and touch something". If you can keep the FPS up while launching a heavier pellet then you're also going to be able to touch something effectively. There are those who favor light pellets to keep the FPS up to astonishing levels. But a light pellet won't carry as far as a heavy one since it doesn't have the mass to keep up the momentum, This is why I'm fascinated with the Korean and Turkish guns. They get high velocity out of regular pellets - and can get decent velocity out of cast projectiles. This allows you to have a flat (relatively) trajectory while transmitting amazing power at the target. FPE doesn't tell as much (to my mind) as FPS and pellet weight. Theoretically you can drive a 7 grain pellet to 1,134.2 FPS and obtain 20 FPE. 1,035.37 fps will give you the same FPE from an 8.4 grain pellet. Now let's reach up a bit higher for 30 FPE and you'll drive the same 8.4 gr pellet to 1,268.07 and 1,389.1 with the 7 grain. At those speeds you can pretty much kiss accuracy goodbye. If you kick the pellet weight up to 15 grains, however, you only have to drive it to 948.94 to reach 30 FPE. You've got the FPE while keeping your projectile within the generally accepted velocity for accuracy. A Canadian would have to launch a 55 grain projectile at 495.57 to reach 30 FPE and stay under their 500 FPS velocity for a non PAL rifle. Of course, the minute they test that rifle with a light pellet - he's busted for having an illegal weapon.Here in the UK all air rifles are measured by ft. lbs. in power. But I have now come to treat any stated figures with caution, as it all depends on what pellet you are using. How can you honestly sell someone a 'legal power' air rifle that is 11.9 ft. lbs. in power (has to be below the actual number of 12), when they could so easily just use a higher grain pellet than whatever those stats were conjured up with, and take it to over the legal limit? At the same time, if you're using a lighter grain pellet, you could kick up a stink for not having anything near 11.9 ft. lbs.It then gets even more confusing when they detail the power in Joules for replica CO2 pistols and FPS for airsoft guns... all the while being left open for question by the weight of the ammunition you use.