I'm thinking 1300 is safe. Think about it. 1100 was safe in originals. I know that's an over simplification, but when my loads chrono 1297 I round up. Still they are just about as sedate in the heavy Henry as can be. No signs of sticky extraction. No leaking around the chamber. Your own findings may vary.
Dan
"It's a source of great pride, that when I google my name, I find book titles and not mug shots." Daniel C. Chamberlain
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