Now that I've had a chance to play with different calibers, I would have to ask ..."which?". Or is this a strictly generic question? For my G22, I'd have to say Winny bonded pdx1, 165 gn. For my 10mm (still haven't tried the Swampfox Don), Federal Premium Vital Shok Ammunition 180 grn. Haven't yet fiet any JHPs through my 9mm. For my 22wmr, have to say Winny Supreme - 34 grain JHP. I have observed that CCI 40 gn hollows do NOT expand at all passing clean through a phone book with ZERO expansion! Surprised the heck out of me to see that!!