Try a faster burning powder AP70 in my 6" barrelled pistol with a 135 grn cast HP shoots best at 7.3 grains
For lighter loads I use 700X powders like AS30 AS50 WW231 Red dot are in the same burn range will keep the pressure up
Look for a mould for the 173 grain 357429 Lyman it is the original bullet used to develop the .357 Mag back in 1935
I have a one and can sell you some projectiles if you like.
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