i believe its the 185 grain in general. 1st few range trips i only took 230 fmj (wwb). Failure every other mag up to about 200 through the gun. the last trip i decided to add 100 rounds of 185 grains (50 remington, 50 lawman) in addition to the 100 rnds of 230 fmj (wwb). well this gun is pretty much broken in & i still had 2-mayb-3 ftf/nose dive out of the 100 230 grain fmj. but the 185 was flawless of both brand (i especially like remingtion). to be noted, i alternated the mags in & out; one mag 230, one mag 185, etc....needless to say i left with 20 185 remington fmj for defense untl i get some jhp.