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In general most smokless loads at 50-70 speed are less pressure but I am not a 50-70 trap expert as all the ones I have had where rolling blocks. I had a lot of old made in the 20s used brass and every one loaded with BP popped the head of but would take 46 grains of 3031 till you jammed 65 grains of FF in them then instant head seperation. Kind of amazing what rock blasting powder AKA FF black can do.
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