I have the H&H for a Beretta, and have been using the Winchesters in a 2 frame GH. There is data out there for the Winchesters and I feel safe using them in the GH. I do use RST and recently purchased some Double wide spreaders from Polywad. I contacted the Hull cartridge company twice with no response. But seeing how the Winchesters and H&H are very similar, both 26 grams and #8 shot one being 2.5 and the other 2.75 it got me thinking about loads and pressures, unfortunately I don't have the experience the board has and thought to ask, as I find it absolutely fascinating. My ultimate goal is to load up some Parker brass shells and use them exclusively.
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