12 & 20 G have settled on AA hulls for my “short” chambered Parker’s. They are about the shortest factory hull I measure them at 2 & 11/16. Measure fired not very precise but they work well with lightest published Alliant loads.
16 is were I am fussy about length. Parker Hammer with lightning cuts, Twist too. Use RST 2 1/2 new then reloaded.
Bit too long is gun specific my opinion. Some OK others not.
William
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