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More than 10 years ago I experimented to see how much power I could get out of a Kel-Tec P32.
I welded an extension on the muzzle and welded up the feed ramp. I loaded longer than would feed from the magazine. I used 110 gr bullets.
Factory 32 acp ammo would penetrate ~ 1" of Douglas Fir lumber.
I worked up to 5.2 gr PP, 110 gr 1.175", 5" penetration, sheared off slide stop/ejector .
So the recoil damaged the little gun, and I had to wait for new parts to arrive.