Yep, conquer and divide. To find out whether it is an ammo or a gun issue, run Mini Mags. If the problem persists, look to the gun.
Make sure the chamber is absolutely clean. In the past I have lightly polished the chamber and radiused the mouth with
a tapered stone on a Dremel tool followed by water based valve lapping compound on cloth to polish. The radius should be very small, just enough to take away the edge.
