GL,
Not sure if the is goes here. Not too many threads taking about Jack Hammers and really only one thread on 10mm. Started testing the waters today with the 137grn .355 JH and the 150 grn .400 JH. Gun used for both was a SIGP226.
I couldn't find any load data for 137grn bullets to start out, so I extrapolated between the 147grn Hornady and the 124grn. Usually this works for me, but I did have a whoopsie moment with unique….
.357 SIG 3" barrel, 1/16 twist, starline brass, CCI 500, COAL 1.135", 137grn JH
-CFE Pistol 6.5grn 1187fps
-Blue Dot 8.5grn 1220fps
-Unique 7.5grn 1389fps (DO NOT USE, blown primer, pretty sure I could fit a large primer in the pocket now). I will drop down to 6.5 (max for the 147grn Hornady) and try again.
40 S&W 4" barrel, 1/16 twist, win brass, CCI 500, COAL 1.120", 150 grn JH
-CFE Pistol 7.8grn 1319fps (didn't see any pressure signs, but this is much faster than book loads for 150grn Nos JHP so I'm not going to go any higher)
Sorry not more data but hope this can help someone who is trying to start out with the JH.
Ryan