Barrel length issue - Rifle Shooter Mag

No Fear in Accuracy

Well-Known Member
Joined
Nov 15, 2001
Messages
318
Location
Canada
Hello,

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

Hmm?

-Denny
 

Michael Eichele

Well-Known Member
Joined
Jan 6, 2003
Messages
3,880
Location
The rifle range, or archery range or behind the co
Barrel length and velocity isnt always what it seems. Example in my 308s I get 20 FPS difference per inch. I have a 24" and a 26" barrel, 20 FPS is only safe velocity difference. Now I shoot the 26" er with a 175 at 2750 FPS, accuratly
, The 24" er is capable of 2700 FPS safley, the flip side is with the 2" shorter the muzzle pressure and blast is increased to the point it smacks the crap out of the bullet as it leaves the muzzle and wont shoot a group under 1"-1.5" I then have to reduce the loads to 2550 to acheive the same .250 groups I get from the 26"er. A muzzle brake solves this problem, but then that just adds 2"more and I might as well have it in barrel vs a brake
 

Trending threads

Nightforce has great tracking capabilities, they are rugged, a bunch of elevation, holds zero forever, and reticles are designed for long range shooting. So if you are looking to shoot long distances constantly, then you need a scope that can take the abuse. -- gilmillan1


Culture Of Excellence At Nightforce Optics
By Len Backus

A high level of quality both in production and in service. Read More


Nightforce is such a solid combo of reticle, available elevation, glass that is good enough to shoot at the longest range you can dial. Nightforce has bullet proof construction that can handle the incidental horse rolling or some other rodeo action. -- bigngreen


Nightforce ATACR Scope Review
By Jeff Brozovich

The new NightForce ATACR is for sure a top choice for any long range shooter. Read More


The total package. Nightforce is the best I have used as far as turret feel and solid detents. I have never had one that didn't track right on and always return to zero. Nightforce NXS is the best value for everything I need. -- Broz


Nightforce Velocity 1000 Reticle Review
By Scott Shreve

I think Nightforce knocked it outta the park with this reticle! Read More

NightForce


Top