What caliber do these dimensions match?

awp101 · Post by **awp101** » Mon Mar 08, 2010 11:06 am

I found a barrel blank at Brownell's with the following specs: .306"/.312", 1-22" Twist

Doesn't seem right for a .308, any ideas?

Terry Murbach · Post by **Terry Murbach** » Mon Mar 08, 2010 11:16 am

THAT IS A 303 OR A 7.7JAP THAT IS SMALL ON THE BORE AND A NOTCH BIG IN THE GROOVE. IT SHOULD SHOOT JUST FINE, BUT I WONDER WHAT CAUSED THAT BASTARDIZATION OF THE NORMAL SPECS. WITH SPECS LIKE THAT GIVING .006" DEEP RIFLING .312" BULLETS SHOULD SHOOT LIKE A MILLION BUCKS, PARTICULARLY LEAD CAST BULLETS.
INTERESTING...

awp101 · Post by **awp101** » Mon Mar 08, 2010 11:19 am

Thanks Terry! As you were posting, I found the same blank listed at Track of the Wolf and they're saying .32-20.

No matter what, I don't think it would be smart to chamber it for 7.62x39 since the surplus I have runs .311" IIRC and I think the commercial fodder runs .308, again IIRC.

Terry Murbach · Post by **Terry Murbach** » Mon Mar 08, 2010 11:49 am

GEEZ, I NEVER THOUGHT OF 32-20 EITHER !!! THAT 1-22" TWIST IS THE TIP OFF THAT IT IS MEANT AS A PISTOL CARTRIDGE BARREL RATHER THAN A RIFLE BARREL.

Buck Elliott · Post by **Buck Elliott** » Mon Mar 08, 2010 12:08 pm

I'd say you've got it... .32-20

Rifling grooves are only .003" deep.

awp101 · Post by **awp101** » Mon Mar 08, 2010 12:13 pm

Terry Murbach wrote:THAT 1-22" TWIST IS THE TIP OFF THAT IT IS MEANT AS A PISTOL CARTRIDGE BARREL RATHER THAN A RIFLE BARREL.

I didn't catch that either. It's only about double what I need...

Don McDowell · Post by **Don McDowell** » Mon Mar 08, 2010 2:24 pm

Would probably make a right fine 32-40 target rifle.

KCSO · Post by **KCSO** » Mon Mar 08, 2010 2:44 pm

1-22 twist would be way to slow for a 303 they run right at 1-10 but that would be about the right twist for a 32-40 but the bore would be too tight. It might be a chunk of 32 pistol barrel though.

Terry Murbach · Post by **Terry Murbach** » Mon Mar 08, 2010 3:18 pm

Buck Elliott wrote:I'd say you've got it... .32-20

Rifling grooves are only .003" deep.

THANKS BUCK, I MESSED THAT ONE UP ALSO. I GOTTA QUIT DRINKIN' OR SOMETHING. OH...WAIT....I AM T-TOTALLY SOBER....THERE IS THE PROBLEM !!! NOW WHERE IS THAT BOTTLE OF BRANDY....?

awp101 · Post by **awp101** » Mon Mar 08, 2010 3:39 pm

Brandy? BRANDY!?!?!? I'm crushed...

Retro · Post by **Retro** » Tue Mar 09, 2010 12:53 pm

Brandy is the drink of heroes.

Only a hero would be brave enough to drink it.

-- Ambrose Bierce.

<- note where I am. Brandy is the local firewater

JB · Post by JB » Tue Mar 09, 2010 2:59 pm

How about 310 Cadet (Greener)? I don't have the specs in front of me, but it sounds close. I'd have to slug my Martini to measure.

shawn_c992001 · Post by **shawn_c992001** » Tue Mar 09, 2010 8:07 pm

.308 win are usually rifled 1-10".

cas · Post by **cas** » Tue Mar 09, 2010 11:00 pm

JB wrote:How about 310 Cadet (Greener)? I don't have the specs in front of me, but it sounds close. I'd have to slug my Martini to measure.

They're all over the map from the .312" range all the way up to .323" or more.

(Mine is .318")

What caliber do these dimensions match?

What caliber do these dimensions match?

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