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 M1 carbine bullet diameter
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Starting Member

8 Posts

Posted - 11/15/2018 :  7:24:19 PM  Show Profile Send Uechi a Private Message  Reply with Quote
Every reloading manual shows bullet diameter of .308. Reloaded 200 rounds with two different mfg 110 grain bullets. One batch shows bullet diameters between .308 to .309.
The second batch all measured at around .305. Both bullets were listed and sold as .308 for M1 Carbine. After finding this variance I checked two commercial 30 carbine ammo. Both Armscor and Remington measured .305.
If it is suppose to be .308 why variance. Concerned the ammo I reloaded that measured .308 may be oversized and not safe to fire.
Inputs please thanks.

Jeff Dromm

Greenhorn Member

39 Posts

Posted - 11/15/2018 :  7:36:14 PM  Show Profile Send johniv a Private Message  Reply with Quote
I have always loaded the Hornaday and Sierra and found no problems with them. That said I never miked them. just loaded and shot. What brand bullets are you loading?
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3335 Posts

Posted - 11/16/2018 :  12:47:40 AM  Show Profile Send Tuna a Private Message  Reply with Quote
Wow .305 is small. It should be no smaller then .307 which Remington almost always is and .309 that others use. I would guess that the pressure of the burning powder is supposed to force the bullet to expand to fill the barrel but to increase 3 thousands is quite a bit and more if your bore is a bit worn. If your bullets are at .308 then your fine so enjoy shooting them.
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3167 Posts

Posted - 11/18/2018 :  9:38:51 PM  Show Profile Send jimb16 a Private Message  Reply with Quote
Mil spec on a new carbine barrel is supposed to be .3075, not .308. But .305 is too small unless it is a hollow base bullet.

OGCA Lifer,NRA Life member, son of a 325th GIR Glider Rider
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