gee...maybe Franco was right about you guys...lol.
i don't know what to tell ya...my Nosler manual is plain as paper 42-46gr Varget for the 168gr CC HPBT
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i'll admit, I single load with the gas system off when I'm testing reloads on the XM21, but she sure liked what I fed her today. i took the mid-range of my most accurate loads from last time and split them up into even more groups with less variation of charge between each group so I could really see where the sweet spot is.
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today's results were better than I could have ever expected, as there seems to be a nice wide(ish) range of charges it likes...at least a half grain of leeway in either direction, but I think i'll go with 44.2gr because it's at the lower end of the mid-range, but also the best of the bunch. there were other targets for lower and higher charges, but the rifle didn't like either. the nosler manual states that 44gr was the most accurate load tested....I found slightly better luck with just a little more oooh-la.
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normally with the Garands I've been shooting as low of a charge as possibe...I guess what you're telling me is that I need to find something lower for the XM21?
regardless...it was a good day at the range and I'm glad i at least found a load that 'works' in the XM21...even if it's not optimal. i'll try out the 155's at some point and see if i can find something that makes a little more sense for the platform in regards to longevity of the parts.
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just out of curiosity...what are you guys using for loads?