Hoyt Id be interested in knowing how you went and seeing some data. ive recently been reading into how much velocity is lost with actual before an after tests with same ammo especially..
would be cool to make a thread with your experiences on this. or if your not into that shoot me a pm .
I'd like to know which calibres on what rifles an barrel length before an after aswell as your velocitys b & a.
much appreciated WL
I just wrote out a long reply, hit the wrong button and lost it all! I don't have the will to write it all again (the air was blue with cussing for a couple minutes)... so very briefly;
Most of my barrel "bobbing" has been with H&R Handi rifles... once I battled my OCD for control and stopped chasing peak, optimal performance from every caliber (and crunching numbers and making spread sheets etc...) I realized that these guns are extremely nice handling with short barrels... some of them started as 22" standard barrels, some were 24" heavy barrels and two were 26" barrels (.25/06 and .280 Rem)... one was a 32" BC .45/70 that got trimmed to 26"... the calibers bobbed to the legal minimum of 18" were .22 K-Hornet, .221 Fireball, .223, .22 BR Remington (rechambered Hornet), .22/250, .243, .260 (barrel stub with Shilen barrel from 26" to 20" yet to come), 7mm-08, 7X57, .280 (26" to 20"), .30/30, .308 (24" to 20"), .30/06, .338F (barrel stub with Krieger barrel 26" to 20"), .358/.356 Win (rechambered .35 Rem and cut with the rim), .35 Whelen to 20", .357 Maximum (rechambered from .357 Mag and from 22" to 18"), .44 Mag and .45/70. In general, I developed loads and tested the barrels BEFORE cutting and then used the same batch of reloads to test after cutting... general observations were that there was a loss of 90-125 FPS for a 3-4" bob; some a little more, some a little less, but that is a pretty good reliable median IME... generally you loose MORE velocity with the smaller, lighter, faster calibers than you do with the larger, heavier, slower calibers for the same amount of bob... For the most part accuracy actually improved after the bob, but this could be attributed to an improved crown (I'm making no assumptions)... My fly in the ointment was two .308 heavy barrels that started at 24" and went to 21" and then 18"... I lost 250 fps from the 6" bob, but accuracy went to hell in a handbasket... I eventually scrapped the barrels, when I could not find a load that would give satisfactory accuracy (at least for me)... I subsequently settled on 22" in a heavy barrel .308 and have an excellent load with very good accuracy. If I can find the spread sheet, I will send it via PM. If you are interested, I have some pics of bobbed Handi's, but I wont bore the folks on this thread.