No one has answered on the 28 and don't see any published data with 5/8 oz
I look for the lightest published loads that are just a bit over over my chosen shot weight. Back off one shot & powder bushing size see how it shoots.
For example I shoot 3/4 oz in a 12 G. # 1 Frame Damascus Parker GH. No published 3/4 oz data using Red Dot, only powder I can get. Lightest Alliant recomended load with Red Dot is 7/8 oz shot 16.5 Grs
Backed off one bushing power and shot loaded 3/4 oz and 15.7 Red Dot. Works great burns clean. Over published risky, under just a bit not so risky. I did fire the first few in a Remington 870 just to be sure.
William
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