As others have stated 280 loads are fine as starting point. I have tried various powders/loads from 2209, 2213sc, RL19 and 2215 on 140 gn AB's, 150 gn partitions & 154 SST's.
2217 gave me best results & accuracy but I'm still chasing more fps for my 30 yr old HEYM. Love the calibre
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