which barrel to keep??
First; A friendly hello to all from Europe:)
Guys, i got a dilemma here, you might be able to give some advice about the following:
i bought 2 green mountain 25 inch barrel blanks in .22 caliber.
One is a 1:14 twist wmr barrel, this one
http://www.gmriflebarrel.com/productdetail.aspx?id=324059
the other one a 1:9 5.56 ar15 type barrel, this one
http://www.gmriflebarrel.com/productdetail.aspx?id=324057
I can’t find the exact specs at the moment, but i’m like 90 percent sure the 1:14 barrel has got a bore size of .219-.223 and the 1:9 a .220-.224 bore.
Took a few shots over a chrony; With a standard valve and 3000psi pressure the bullet will fly at approximately 250 to 280 meters per second, so definately subsonic, at around 65 to 70 footpounds of energy.
Yesterday i had the time to test them ad 35/40 yards with some roundnose 40 grainers, and both seem to perform equally well. Tried 30 grainers, but they were all over the place..
Now, the situation is as following: i’ll be moving to another country soon, where it is perfectly legal to shoot airguns, and i can take one barrel with me. The rifle and one barrel will be sold. I’ve found one 40 grainer over here that groups really well, but it’s questionable wether i can get that exact same one again.
So here comes my question:
Which barrel to keep?? :confused:
I’m planning to shoot either 30 or 40 grainers with one of the barrels, maybe even some pulled aguila sss 60 grainers, at max 300 metres per second. I’m trying to choose which barrel has the best chance of performing well at distances up to about 100 yards.
Will the 1:9 twist spin the bullet to fast at longer ranges, loosing accuracy, or will the 1:14 be too slow to stabilize the bullet at longer ranges?
Looking forward to your input, with kind regards, Vincent
All Replies
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hi, here we are again
posted the same question at the cast boolit forum & the yellowforum, and it’s interesting to see that the airgunnners put their money on the 1:9 twist barrel, whereas the cast boolit maker say i should do best with the 1:14 version.
here’s the thread on the cast boolit forum :
http://castboolits.gunloads.com/showthread.php?t=32907
So, do you guys know which barrel twist you normally need for a stabilising a subsonic 40/44 grain powder powered bullet ? That would be a very similar situation to the conditions that are present when i ‘fire’ a round at 250 to 300 meters per second with this bullet….
I think that the reason why there are so few .223 Condors/Talons out there is that when people look beyond the venerable .22 they look straight at the .25 which is easy to obtain and does great thinks ballistically.
ok, thanks for this advice teflon. you’re absolutely rigth about the pellets, for those an conventional airgun barrel would be best. It kinda surprises me that there are just a few .223 talon airguns out there. Those bullets keep their energy much longer and are less prone to wind compared to relatively light diabolo shaped pellets.
I think that you will (probably) find that the 1:9 barrel will help stabilise the pulled bullets better, as long as you can achieve a decent velocity on them. The 1:14 would be more suited to diabolo shaped pellets rather than bullets, but the advantage would be a wider selection to choose from, and if you just want to shoot pellets than a regular airgun barrel would have been the better choice.
Viewing 5 replies - 1 through 5 (of 5 total)
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Almost all commercial 22LR barrels are 1:16 twist rate. Your 1:14 twist will more than stabilize anything up to 50 grains with ease. The 1:9 might show problems because of its hyper fast twist. If your lead is too soft it may strip the bullets instead of twisting them, and you’ll have a shotgun instead of a rifle.