the wads I used were White, without the felt base I had the indentation like yours. Use a felt/cork base & trim the petals back to the shoulder of the slug, this improved the accuracy of mine heaps. 21grains felt like 1200-1225fps (just cycling the action on the Remington 1187) & 21.8 feels like 1300-1330fps (feels like the fast trap loads I use & blows up rabbits great at 50yds). I use a fold crimp. I shoot Trap & Skeet so compare recoil & speed to the pattern sheet, at 50m the with 21.8grain the slug goes through the wooden pallet & folds the waratah in half almost cutting it off.
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