With one of the adjustable gas blocks in place, you can run about whatever powder you want without fear of bending the op rod. Just don't forget to have it adjusted properly before firing!
I shoot the Nosler Custom Competition 155 grain and 168 grain, and the Sierra 190 HPBT Matchking. The Sierras shot well, but are very expensive in comparison. I loaded 48 grains of W748 for the 190s, this is neither starting nor max load, it is good in my gun. You should reduce and work up.
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