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If you can lay your hands on some Accurate 1680 powder I think you'll be happy with the results over the H110....the 1680 has a longer pressure curve which helps with cycling issues found with the more abrupt H110....the primer flattening should go away also....
the only buffer mods I have done is to drive the roll pin out, open the buffer and remove or add weight to see how it changed the cycling.....with the charge I'm running now I ended up being able to use a full weight rifle buffer....loads at or under 25gr of 1680 with a 125TNT I had to run a reduced weight buffer....
hope this helps,
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