I load 100 grain bullets over 5 grains of AA #5 for mine,...which is a maximum load per several manuals. It's just a bit warmer than most typical commercial loads that I've shot.
The LCP Max doesn't hurt my hand, but it's rough on the trigger finger.
I recall you saying you had inadvertently fired some 40,000psi loads through your LCP Max and it shot loose.
If it’s anything like mine, it was prob’ly pretty loose when you bought it. I can rattle mine on the slide rails.
