I have a ton of experience with Longshot in the 40S&W and 10mm. Our 40 carry load is 155 XTP 8.5 grains Longshot with CCI-550 primers yeilds 1266 fps. In 10mm I get 1350 with 180 XTP's.

I got the same velocity you did from 9.3 grains using 155 XTP's but ran into feeding issues from too high of slide velocity. It caused nose dive FTF. Had to back off to 8.5 to get absolute reliability but is still over 500 FPE. Very respectable. He actually used it yesterday to dispatch a black bear.


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