Mosin Nagant Counterbore

**Rosko Packer** · August 16th, 2008, 01:23 AM

I'm not sure if I understand the whole counterbored thing when Mosin Nagant rifles are discussed. I have a MN. Haven't done anything to it but shoot it (just an ugly milt rifle). How do I tell if it has the infamous counterbore done? What is it done for? What difference does it make as far as shooting is concerned (not collecting milt, just like to shoot it).

**egon12** · August 16th, 2008, 07:58 AM

The best way to tell if your gun has a counterbore is to take a round and place the bullet tip into the muzzle end of the barrel. If the bullet freely drops to the shell casing chances are that it has been counterbored. It is hit or miss with the mosins being counterbored. Any model can have it done but the M-38's seem to be the most commonly counterbored. The russians counterbored the barrels to prolong the life of the barrel by cutting away the bad/worn rifling at the muzzel end. If done properly a counterbore will imporve accuracy. If you just want a shooter then a counterbore would not bother me. The only time counterbores are a problem is with the collecting types that want a pristine example. Shoot and enjoy it. Wheresle are you going to find a highpower rifle for around a c-note.

**bogey1** · August 16th, 2008, 09:29 AM

just checked mine, no counterbore here. thanks for the info.. bogey

**Rosko Packer** · August 16th, 2008, 10:32 AM

Ya, thanks Egon12, no CB for me either. My MN shoots fine so I guess it wouldn't matter according to your info. I've got the LONG model it's a kick (pun intended)

**dearborndevil** · September 11th, 2008, 12:02 PM

I noticed that my M44 has about a 3/4" long counterbore. From the muzzle, the bore looks HUGE. This had me thinking. I'm wondering if the counterbored area, can be milled at an angle, to create a muzzle brake effect.

Any input?

**bigdog02** · September 11th, 2008, 02:46 PM

Some of mine are, some aren't
My 1927 ex-dragoon is now, but my 1942 tula is, go figure.

**elitefirearms** · September 11th, 2008, 06:25 PM

Originally Posted by dearborndevil

I noticed that my M44 has about a 3/4" long counterbore. From the muzzle, the bore looks HUGE. This had me thinking. I'm wondering if the counterbored area, can be milled at an angle, to create a muzzle brake effect.

Any input?

Im not a gunsmith but I dont see why you couldnt. Its not goint to mess up the rifling at all. You could always get it ported to. Its would be the only M44 that Ive ever seen ported.