Originally Posted By 79Berlinetta:
When I got my Ruger MKII years ago, it would jam and not feed or eject rounds. I called Ruger and they said to send it in which I did. I got a phone call a few days later from them and the person there asked me if I was trying to shoot Remminginton Thunderbolt ammo through it to which I replied yes.
He said, and I quote, "NEVER use unjacketed ammo in our MKII pistols. The lead is too soft and distorts when the bullet hits the ramp into the chamber. Please use jacketed ammo and it will be fine".
Since then, I have ALWAYS used CCI jacketed bullets and it NEVER has a problem with loading rounds or ejecting rounds in and out of it.
I have never seen jacketed .22LR bullets from CCI or anyone else. I've only seen plated bullets. That said, I use plain old lead bullet .22 in my 22/45 all the time. If I start to get failures, I know it's time to clean the gun AND disassemble/clean the magazines. Usually good for another 1000 rounds or so, mostly shooting suppressed.