I use Claybuster wads and in 12ga for 1, 7/8, and 3/4oz loads their different wads vari in height about .060. Some wads are made for 7/8 and 1oz loads. It's a balancing act to use the right powder - some take up more room - and the right wad and shot to get the proper height for a good crimp. I never use any wad pressure - just enough to seat the wad. More than that and you're just crushing the cushion part of the wad and it may want to push back up later giving you trouble. A lot of guys have trouble in the begining because they don't leave enough of the shell sticking up above the shot for it to fold over for a good crimp. It takes more than one would think. Now for a fold crimp you need a lot less - just enough to roll over. From my old Lee handloader they recommend:
-- star crimp --- roll crimp
10ga 19/32 --- 7/16
12ga 1/2 --- 3/8
16ga 15/32 --- 11/32
20ga 7/16 --- 5/16
This is with the old fiber wads that don't have hardly any give where as the plastic does and this gives a bit more lee way. Hope this helps understand what's happening and what you have to do.
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Paul Harm
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