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You are not going to get flash over or S.E.E in a pistol cartridge; do not open flash holes in any case all it does is stuff the case,
The reason your ES open up is the pressure drop below its...

AP70 could be too slow burning for Sub loads my best accuracy is between 6,5 grs and 7.3 grs with the 166 grain cast bullet it does over 1000 fps in a 6" pistol barrel
you are correct it is a...

Use a fast powder like ADI AS30 Red dot WW231 N320 Bullseye start with .38 Special maximum loads in .357 Mag cases
Try these for projectiles,...