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.312 seems awfully loose?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?????????
internet search found this:that's what i thought. maybe they are referring to grooves not lands?
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.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.
Mini thirty (newer one not the minute of barn older one).........Use to have a Colt years ago also.what rifle are you firing from?