I bought a 10" octagon 22 LR off of a friend and knowing little what to expect brought it home, gabbed some 22 LR ammo and walked back to try it out.

Couple of shots to get it on paper and then 5 for group at 50 yards.

HOLY MOLEY that must be a mistake . . .

Shoot 5 more and it likewise is minute of Squirrel eye.

Great this is some old Olin pistol match given to me years ago and I only have about 20 rounds total.

In testing other ammo will hold minute of squirrel head, so I think you could get lucky and stumble across a barrel like this. and