7.62x39 Velocity vs Barrel Length.

[arakboss]

I am thinking about ordering a $70 stainless steel 16" 7.62x39 barrel for an AR15 bench set up. Normally I would go longer for a bench rifle upper but the selection for inexpensive 7.62x39 barrels longer than 16-18 inches is very limited.

This guy tested some factory steel cased rounds out of a test barrel beginning at 24" of length and cut it down to 16.5". He only found about 100fps difference. Would those velocity spreads be much different with slower powder?

7.62×39 mm Russian: Effect of barrel length on muzzle velocity

In this post, Rifleshooter.com will be testing the effects of barrel length on velocity for the 7.62×39 mm Russian Cartridge. Chambered in the SKS and AK-47, the 7.62×39 mm Russian cartri…

rifleshooter.com

Is a 1:10 twist suitable for 150gr projectiles.

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[TTSX]

1:10 is pretty standard for .308 and so are 150gr bullets so I'd imagine it'd be more or less suitable for x39.

Perhaps you should put that $70 towards what you've already put on your card, though. Buying just because it's inexpensive doesn't seem like a great plan.

 

[Phantom Man]

Those results don't seem right. YouTube has a lot of videos covering the leangth subject.
I believe slow powder would effect results too.

 

[The Heretic]

7.62x39 is designed and manufactured for 16" barrels.

It does better in short barrels than 7.62x51 or 5.56x45

 

[RicInOR]

I just watched Coch do a comparison with the AR platform.