The problem here is I think two fold & does make perfect sense.
1st, when the crimp folds down around the projecting petals of the wad it creates a resistance to the wads moving
2nd, with the light shot load the wad is not compressed to its normal extent leaving the wad "Stiffer" than normal.
I can only say it again - neither of those contentions make any sense to me at all. How any of that could have an effect greater than the different crimps and really
significant differences in crimp depth I've seen and made is quite beyond me. I'd like to see a 3/4oz loaded in a 1 1/8 cup and crimped to look like anything approaching normal. No way that crimp is going to do anything but fold right into the case.
I'm perfectly willing to be convinced otherwise - show me the pix of the loads and the data.
Stan - I thot I blew out $/time on stupid projects but you got me by miles. Flip that tiny crap and get a decent 28ga. BTW where'd you score the trigger for the tank model Perazzi finally?