Mosin 7.62x54r throat diameter

Hmm... that's an interesting one.

First thing that came to my mind was, in the heat of battle, the rifle was ran over on the battlefield, by a huge, heavy German King Tiger tank, subsequently recovered and, because of the urgent need for any serviceable weapon, it was restocked and put right back into service with no other checks being done.

Probably a more mundane explanation but in my mind that's how that old warrior lived it's life.

If the rifling is odd number you need a V base micrometer to measure. If even go land to land Highest reading, normal calipers work.

They do have an oval bore.

If you're looking for super accuracy by doing all these measurements, good luck. Even M-N's in great shape, the chamber is measured by locking the action with one in the chamber and then shaking the gun. If you don't hear the cartridge rattle, you got a good chamber.

I jest. But these guns, for the most part, have been shot, and shot, and shot and..... things get out of round and barely within spec. If you can hit one minute of center mass at 150 yards, you did what the gun was designed to do. I've got a 91/30 and a M44 carbine. They're both fun to shoot, but I wouldn't enter a match with other shooters using 1903's.

amp-rat said:

Think a 1944 Izhevsk might be a .308 and not a .311 ?

Click to expand...

If yours is .308 bore it's the first one I've ever heard of. Specs called for .312, but the +/- was, uh...larger than you may think.

Wartime Mosins, and Izzys in particular, are not known for exact measurements and finished machining.

I had a 1942 Izzy with a .316+ bore. Try loading a 316 cast bullet in a .335" chamber. That one introduced me to neck turning.