Just a quick question, I got a box of MBC's 148 gr double ended wadcutters from their tax day sale and it seems they have a crimp groove. My Speer manual only lists data for hollow base wadcutters which they say to seat flush with the case mouth, but I'm guessing seating to the crimp groove and using the hollow base data should be fine. I'm going off the fact that the hollowbase might leave more room than the flat base but seating up the extra distance for the crimp groove will take care of that.
I'm planning on using the Speer recommended 2.8-3.1 gr of bullseye.
I'm planning on using the Speer recommended 2.8-3.1 gr of bullseye.