View Full Version : .310 dia bullets in .308 dia bore

July 23, 2007, 22:06
I just got a hand full of incendiary .310 dia bullets from Hi-Tech. I know that it is possible to run .310 bullets through a .308 bore. In my research for loading 7.62x39, I found a statement to the effect that starting loads become max loads when running .310 bullets in rifles with a .308 bore.

Would this rule hold true for loading .308 Win?

July 23, 2007, 22:24
I would imagine so. For the simple reason that the bullet's oversize to the bore's diameter represents increased resistance, hence increased pressure.

I wouldn't.

Would it kaboom ?

I doubt it. But "doubt it" isn't good enough for me to pull a trigger on it with my face up to it.

Gonna leave that particular experiment's results out of my personal experience journal. (yes, I keep one, I forget a lot, so I write a lot)

July 24, 2007, 08:23
I'm with Owl on this one. The .308/7.62x51 is a high intensity cartridge and pressure jumps rapidly.

Also consider that a lot of .308 bullets actually measure .307~.3075.

Ain't worth the troubles!

English Mike
July 24, 2007, 08:41
IIRC the bore on 7.62x39 firearms is in fact larger than on those designed for the 7.62x51 round, thus leading to the differing bullet sizes, despite the stated bore diameters being identical.

July 24, 2007, 08:46
OK then... I'll have a bunch of incendiary for the AK.

My face and my wife thank you all for your input.

July 24, 2007, 14:09
My experience with 7.62x54R tells me that the guns that use it run a bore size (i.e. down into the groves) of 0.309" to 0.310". I believe the same is true of 'real' AK47 barrels. Some US made AK barrels may use .308" as their bore dimension. Slug yours and see.


July 24, 2007, 20:23

,... choot 'em.

July 24, 2007, 20:31
I would not try it out of a gun that has a newer barrel on it, some of the R1 barrels that I've seen look like they have shot about 80,000 rounds and look like the groves are almost gone, hence looser tolerances for bullet that is 200 hundredths over size.

I'm with Temp, shoot em! but don't use your good Fal.