As in the subject mentioned, looking for a shot string of a 2240 .22 with a 10" barrel.
Considering to upgrade my 2240 with a 10" barrel and just wondering how the velocity is increasing compared with the standard 7.5" barrel.
Thanks :)
Here is a string, but it is not just a straight swap. I was testing probes and had a valve reducer in there. But it does show the increase over a 7.5" barrel.
Stock 2240
Min fps 410.25
Max fps 436.7
Ave. fps 426.5
Spread 26.45
Std Dev 8.12
2240 10" Barrel
Min fps 438.58
Max fps 450.55
Ave. fps 443.92
Spread 11.97
Std Dev 4.91
so switching the barrel would still leave a 2240 with a 10'' barrel would still be below 6lbs? pretty sure i made a thread asking this question the other day
Quote from: PLauGE on September 16, 2012, 04:31:08 PM
so switching the barrel would still leave a 2240 with a 10'' barrel would still be below 6lbs? pretty sure i made a thread asking this question the other day
Yes, a bone stock 2240 with a 10" barrel will shoot just shy of 6 ft. lbs. If you are shooting where ambient temperature is 80 degrees or above, I could see the gun hitting the 6 ft. lb. mark. If CO2 conservation is of no concern, installing a modified BOSS valve likely could get the gun to shoot harder.
Thanks both ! So there is some velocity increasement by switching to a 10" barrel and it seems that the 2240 becomes more accurate as well 8)
Hoped it was more close to 500 fps, but then I have to switch to 14" or more I guess..
Quote from: CO2Freak on September 16, 2012, 04:45:07 PM
Thanks both ! So there is some velocity increasement by switching to a 10" barrel and it seems that the 2240 becomes more accurate as well 8)
Hoped it was more close to 500 fps, but then I have to switch to 14" or more I guess..
If you are looking for 500 fps, you pretty much are going to need to do some valve modifications and increase barrel length a bit. Look at the BOSS valve. http://www.airgunbna.com/ (http://www.airgunbna.com/) Click the link on the left called 'Application of Parts'.
Thanks - I leave it up to the barrel replacement only ;)
If you switch to a 177 barrel, you might hit the 500 mark.
Quote from: CO2Freak on September 16, 2012, 04:45:07 PM
Thanks both ! So there is some velocity increasement by switching to a 10" barrel and it seems that the 2240 becomes more accurate as well 8)
Hoped it was more close to 500 fps, but then I have to switch to 14" or more I guess..
Nah, mod the valve, heavier hammer spring you can get it up to that ok, eats gas though.
Quote from: CO2Freak on September 16, 2012, 04:45:07 PM
and it seems that the 2240 becomes more accurate as well 8)
Maybe the new barrel is better than the stock barrel. But longer barrels are not "more accurate"
Some how, this became a widely believed fact.
I think it was the PA blog where an experiment was performed on a LOOONG 2240(?) barrel. Velocity was measured, then barrel cut, then velocity measured again, rinsed, repeated. It was about velocity, BUT it also showed barrel length has no impact on accuracy. It shot the same at the end of the experiment as it did at the start.
the longer the barrel
the further apart the sights are.giving a better sight picture
hence the better accuracy
its not that the longer barrel is more accurate,its the longer sight picture where the better accuracy come in
Quote from: 1377x on September 18, 2012, 09:15:57 PM
the longer the barrel
the further apart the sights are.giving a better sight picture
hence the better accuracy
its not that the longer barrel is more accurate,its the longer sight picture where the better accuracy come in
Ding, ding, ding....that's the correct answer. The longer sight radius makes the gun easier to shoot more accurately.
Sounds fair... !
Maybe I was "misleaded" by the word spread in the shotstring information:
Stock 2240
Min fps 410.25
Max fps 436.7
Ave. fps 426.5
Spread 26.45
Std Dev 8.12
2240 10" Barrel
Min fps 438.58
Max fps 450.55
Ave. fps 443.92
Spread 11.97
Std Dev 4.91
I went with the 12" barrel, glad you posted fps for the 10"
Seems like a lot of talk regarding fps without much reference to pellet weight. I saw it listed in the chart but not mentioned otherwise. Is there a specific pellet weight you were looking at to break 500 fps?
I just checked my 2240 with a 10" Mellonair barrel and with 14.3 gr CPHP it's averaging 475 fps. With 13.7 gr H&N Sports it's right averaging about 488 fps. In both cases that's over 7 FPE.
Mine has the stock valve, spring, hammer, etc. It does have the steel receiver and Crosman extended probe and I made a spring guide for it.
I am Average Joe, nice to meet all you guys. I bought and modified out my 2240, I assembled after we got overrun by squirrels at our condo and they ate all the wiring underneath our SUV. I wanted it to stay a pistol so I started with the steel breech (wish I got the left hand or abidexterious) and then got a BOSS RP, put in new hammer and pin, extra heavy spring and power adjuster, extended bolt probe. I just put in the new 60% transport valve. I have not done any trigger upgrades. I was using the 10" barrel and using those tall competition open sights very accurate, but not enough power, I next went to a 12" barrel and power was increasing. I then read the article about J.J.Pelletier cutting off the barrel every 2" til it got to a 13" barrel, and his thoughts that there is a law of decreasing power, muzzle velocity, FPS, that after a barrel goes over 13", the pellet starts to drag, losing power and accuracy the longer the barrel length increased or the difference did not increase that much. There are other articles on this subject on the internet. It made perfect sense to me so I bought a 14.5" barrel and had it cut and crowned. And this is the barrel I now use. It is supper accurate and super powerful, looks very cool I think as a pistol. Sorry I do not own a chrony, I judge by shooting a metal target 33 yards away and can only judge by how fast it hits the target, I have shot 14.3 destroyers, 15.2 domes, and many other weights, it seems to like them all and it is quiet, which I never expected, no complaints from neighbors. I plan to get a chrony, but you can see where I spent all my money. Already had two pistol scopes and a red dot, but I want it to stay a pistol. I plan to scope it, but then I may have to use the stock if it gets too heavy and that's not what I want. Sorry I cannot give you guys the figures. Forget the 10" and go for the 13", you will not regret it. I had the barrel done by Alliance Hobby, and the barrel I got from him was absolutely beautiful blued and crowned he just cut the flat off, cut to size and crowned it. Well I don't have a picture to post, but next post I will! I kept it all blued and black so it didn't attract any attention around our condo compound and it is illegal here in Cook county, Chicago where these .22 that shoot 600+, and I believe with what all I have I am over that. Thank you all for reading this as it is my first post, I have a Scoped 392 which is really great, but a pumper, so I went co2, 2240 and fell in love with it. Thanks, Average Joe
Sorry to hear you live in Crook County Average Joe.
This thread is 5 years old!! Dang. I'm getting old ;-)
Quote from: AverageJoe on March 30, 2017, 07:00:46 AM
I then read the article about J.J.Pelletier cutting off the barrel every 2" til it got to a 13" barrel, and his thoughts that there is a law of decreasing power, muzzle velocity, FPS, that after a barrel goes over 13", the pellet starts to drag, losing power and accuracy the longer the barrel length increased or the difference did not increase that much.
IMO the BBPelliter article is flawed & it was not a Crosman that was tested. I have a chrono and have tested different length barrels on the same gun and FPS increases as the length increases. I have only gone up to 24" and it had higher FPS than the shorter barrels. (2240 style gun)
Just notice where ever Crosman FPS stats are available, Pyramid Air, Crosman ect. that the highest rated is the 2260. No company is going to put a longer barrel on a gun if it slows it down.
Sounds like you have made yourself a fine shooter. :-*
We all like pics also. ;)