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My usual break-in is to start with light loads. If the gun runs without incident then I gradually step up to heavier loads until I'm shooting the heaviest loads that I can find. I keep the heavy loads for a while & then drop down the the load that I intend to be my regular shooters. If I run into trouble with the light loads, I immediately jump up to the heaviest loads and work my way down to the regular loads. So far, I haven't run into any long-standing problems. My Glock 17 has a few thousand rounds with 0 issues. My Beretta Nano had a couple of hiccups with 115gr WWB, so I ran a couple of boxes of Speer Lawman 147gr before backing down to 124gr. The Nano hasn't so much as burped at the 124gr or even 115gr since going hotter & backing it down.