BCA 7.62x39 barrel bore is .312 per BCA

[Grendelhunter]

So i confirmed that the barrels are 312 bor. lots of conflicting info on handloads for this. What are folk using, 308,310,311,312?????????

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[arakboss]

So i confirmed that the barrels are 312 bor. lots of conflicting info on handloads for this. What are folk using, 308,310,311,312?????????

.312 seems awfully loose?

 

[Grendelhunter]

that's what i thought. maybe they are referring to grooves not lands?

 

[arakboss]

that's what i thought. maybe they are referring to grooves not lands?

internet search found this:


Thanks for contacting Bear Creek Arsenal.
The bore groove is .3002, the bore diameter is .312.
Please let me know if you have any other questions or concerns.
Regards,
Michael

 

[Grendelhunter]

Received this email this morning

 

[Grendelhunter]

am i wrong in thinking those numbers are backwards??????

 

[Grendelhunter]

bore should be smaller than lands, correct me if im wrong here. still green to reloading

 

[aasbra]

I typically slug a barrel if I'm uncertain of the diameter and what size bullets are most appropriate. I have several 7.62x39 firearms. My Ruger slugs at .310", whereas my CZ slugs at .312". I've yet to hand load for either (factory FMJ and JSP only) to this point.

What type of bullets are you planning to load for your application? I just measured a projectile pulled from factory Winchester brass cased FMJ at .3095".

I'm planning to try and develop a powder coated lead load for plinking, and would size them different for each of my two rifles. For jacketed bullets, options can be more limited when you move larger than the common .30 cal bore of .308.

 

[Grendelhunter]

I typically slug a barrel if I'm uncertain of the diameter and what size bullets are most appropriate. I have several 7.62x39 firearms. My Ruger slugs at .310", whereas my CZ slugs at .312". I've yet to hand load for either (factory FMJ and JSP only) to this point.

What type of bullets are you planning to load for your application? I just measured a projectile pulled from factory Winchester brass cased FMJ at .3095".

I'm planning to try and develop a powder coated lead load for plinking, and would size them different for each of my two rifles. For jacketed bullets, options can be more limited when you move larger than the common .30 cal bore of .308.

Just pulled the flash hider to mic the end of the barrel to get a rough idea. .302 on the grooves roughly. Looking to develop a hunting load.

 

[aasbra]

For hunting load, are you thinking a JSP bullet? If so, I would try a box or two of factory ammo similar to what you plan to load and see how it groups. If you find one that you like the groups, I'd pull a bullet from a factory loaded round from the ammo it likes and measure the bullet to see if you can replicate it in your hand loads (style, size, weight). Or use a soft lead ball (muzzleloader) to slug your bore and measure the slug to more accurately determine what size jacketed bullet would probably work best in your barrel.

 

[Grendelhunter]

Initial sight in at 100 yards factory tulammo fmj is oddly accurate and projectile measures .308.

 

[deadeye]

What I use for hunting ammo when needed.

Edit: I also use the SST's for other cal's as well as the eld's and monoflex's or if the A-max is available in the weight I want them as well. They are all pretty much built the same, they all work great for deer or coyotes.

First choice

Natchez

www.natchezss.com

second choice

Natchez

www.natchezss.com

 

[Grendelhunter]

What I use for hunting ammo when needed.

First choice

Natchez

www.natchezss.com

second choice

Natchez

www.natchezss.com

what rifle are you firing from?

 

[Grendelhunter]

have had good luck with nosler in other calibers

 

[deadeye]

what rifle are you firing from?

Mini thirty (newer one not the minute of barn older one).........Use to have a Colt years ago also.

 

[po18guy]

Why complicate it? Use .308-.312 bullets and just shoot. If in doubt, slug the bore!

 

[Grendelhunter]

Because I thrive in chaos!!!!!!!

 

[ma96782]

I once read an article......
It said that the .308" bullet works in the Communist 7.62 long guns mostly due to the better quality of construction of the bullet.

Note: my reloading die sets for my 7.62x54r and 7.62x39 both come with expander buttons for .311" bullets and the .308" bullets.

Aloha, Mark

PS.......NOTE : What is available in .308" bullets, .311" bullets and .323" bullets?

MatchKing – Page 4 – Sierra Bullets

www.sierrabullets.com

Hummmm.....So, maybe you're overthinking this?

YEAH, Yeah, yeah.....that is only one manufacturer and only the Matchking line. But IMHO.....IT says something about the hopeful accuracy potential for that range of bullets.

LOL. Rrrrright......where is the selection of 123 grn .311" bullets for the uber accuracy game? You know....for those 1" groups out of my AK.

 

[osprey]

Speer makes a .310 123 gr gold dot bullet which works great for deer with the 7.62x39. Problem is finding them in stock will be hard.