Barrel length issue - Rifle Shooter Mag
I was reading the Rifle Shooter, Sept/Oct 2003 and there was a discussion about the "Barrel Length vs. Velocity". See pg. 60.
I noticed on page 62, they did experiment with H-870 powder on 300 RUM, 220gr bullet.
They tested between 22 inch and 27 inch and the velocity doesn't drop as much as it should.
I was planning to get 36 inch barrel in 2004 and I'll be using H-870 for 338 Tomahawk (neck up to 338 from 300 RUM and blown out shoulder).
I wondered if you use H-870, very slow burning powder, adding two inch on the barrel will make a big difference? I wish to say it will increase 50-100 fps every two inch increase. According to this magazine, the velocity doesn't increase a lot. I specifically talked about H-870 powder with long barrel.
27" - 3,107 fps
26" - 3,088 fps
24" - 3,046 fps
22" - 2,997 fps