Claybusters are too loose and you will get powder migration.
Use the SP-28 in 2 3/4" Cheddite Hull, and SP-28II in 2 1/2" Cheddite hulls.
Universal and 20/28 are nearly identical in loading, and You'll be pleasantly surprised what 11grs will do, behind 3/4oz.
Edit: " too loose" in Cheddite hulls. This is the case using fine grain powders like 20/28. Can't say whether it's also true using a bulkier powder.
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