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I can overload 25acp with 3.2 gr Bullseye and get it to be loud, but I can't get it to kick hard.
I have two 25acp pistols and handloading for them is different:
1) Ruby, cheap POS is 80 years old and still works, firing pin hole is too big and the primer will pierce with 134% extra Bullseye. POS gun won't detonate a magnum primer
2) Colt 1908, great gun, 146% extra Bullseye is all that will fit, and no problems
I think I have another 25acp Colt that some rich old fossil sold becuase it jammed on him. A little cleaning, oil, and hot loads fixed that.
Some company made too many FMJ .251 bullets, as every now and then the are on sale $10/1000.
They cannot make them that cheap, so it must have been a major blunder.