I have reloaded for decades and never needed one, then my son-in-law got a HK Compact 9mm and some of my reloads would jam on him, usually a fail to load. A slight tap on the slide and it would lock up and he could fire the gun. Just for that, I got a rollsizer and ran all my 9mm through it, no more issues on his gun and still no issues on all of mine. The rollsizer fixed all the plunk test issues on his gun that my guns never had.
I am guessing his gun has a tight chamber and since most of my 9mm is range pickups, they had a bulge that my 650 didn't fix during the reloading.
I then ran all my 45ACP through it, but noticed no differences there.
I am guessing his gun has a tight chamber and since most of my 9mm is range pickups, they had a bulge that my 650 didn't fix during the reloading.
I then ran all my 45ACP through it, but noticed no differences there.

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