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This 50gr is the heaviest I will have tested to date in .22WMR
when my Grendle P-30 pistol (predecessor to the Keltec PMR) was new, the Fed. 50gr ammo was the only ammo that functioned 100% in it. now that it is well broken in, the P-30 will reliably shoot any weight .22 WMR ammo. I like the 50 gr. ammo. it hits hard. I chronographed it at 1500 fps. out of the Grendle's 5" bbl. and 2000 fps out of my Marlin 25M rifle.
Taurus 992 6.5" barrel 1034, 1040, 1043, 1020, 1058, 1061. Average 1042.66 FPS/ 121 LBS
:-[ its been a while. and I typed what numbers came into my head. it must have been 1500 out of the rifle. :-[