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  1. AA 1680 for Sierra 300 GR HP .45-70?

    The 45/70 Govt.
    Hi all. I recently came into a box of Sierra 300 GR .45-70 HP (#8900) that I'd like to load for my 1895G. I only have (and can find) AA 1680 powder at the moment and I can't find any load data beyond the Barnes specs. I spoke to a Sierra tech and he was stumped. He was surprised they had no data...
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