Dean, I am using 12.5grs 20/28 in both Cheddite, and Fiocchi 2.5" hulls.
Because of intermittent component shortages, I use Sporting 28-II wads with a standard, unmodified 3/4oz charge bar. The Mec bar drops 13-14 #8 pellets short of 3/4oz.
I have another 3/4oz bar that I reamed out, to get a full .750oz, and when I was out of the SG28-II wad, used the PT-2895 wad. That wad needs a full 3/4oz to get a good crimp.
I never bothered to send these out for testing because that's the charge that Daryl shoots and That's good enough for me.
It's pretty tame. Not Daryl, the 28ga load.
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