Keyholing from ammo

[The grons]

I have a CZ 82 and the last 5 boxes of brown bear ammo are keyholing; I just shot 3 boxes of silver bear hollow points and they did fine so I know it is an ammo issue. Will this hurt the barrell of my gun? If I shoot the remaining brown bear ammo? Heck I have 4,000 rounds left.

 

[andre73]

Brown Bear is a mild steel jacketed bullet that is copper coated. I shot some of the Monarch ammo (same style mild steel over lead) from one of my 9mm's into the dirt in my friend’s backyard. My kids were digging in the spot looking for bullets later that day and lo and behold they found 2 of them. There were almost no marks from the rifling. I think that the jacket is to hard to properly engage the rifling. I did not shoot any paper with them to determine if they were key holing, but I bet they were not properly stabilized.

 

[The grons]

Will these bullets hurt the polygonal rifling in the barrel?

 

[Rat Robb]

Im not sure with handguns but my buddies Polish Tantel was keyholing because the ammo was the right grain. Were the weights the same between the two?

-Robb

PS - Have fun cleaning your gun after brown bear

 

[CWL]

Something is causing the bullets not to stabilize out of your CZ82, it is usually the weight of the bullet v. barrel rifling.
This shouldn't harm your barrel though.

 

[rcmodel]

Something fishy here.

A CZ82 was designed to shoot com-block MAK ammo just like that Brown Bear you are shooting.

Any chance you are shooting loose hanging paper targets?

If a paper target is not taped to a backer board, a JRN pistol bullet will move it out of the way a little before it penetrates it.

That leaves an oval shaped hole that looks for all the world like the bullet hit it going almost sideways.

Try it against a cardboard box backer and see if the holes don't get round again.

rc