Due to the lack of 8x57JR (.318) ammunition availability, I am getting ready to get back into reloading. The rounds will be for a Franz Kettner drilling. I plan on using 200 gr Woodleigh .318 bullets, Hornady 8x57 JRS brass sized and trimmed (I have RCBS 8x57JR dies). I have multiple manuals that have 8x57 JS and JRS loading data--none specify JR. Would the JRS initial powder loadings be the starting point or would it be wise to back off say 10%. Thank!
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