Try reading the post above yours. A 45 grain .25 auto has a muzzle velocity of 815 fps out of a 2" barrel
So I guess we have a miracle
How about you try reading first. fps= feet per second, a measure of velocity, this is not remotely the same thing as foot pounds, which is a unit of energy. The post actually states:
"45gr JHP has a muzzle velocity of 815 fps and a muzzle energy of 66 ft-lbf"
I'm not a mathematician, but last I checked 66 is not greater than or equal to 300.