The center of each group is not shifting much from 23.8 to 24.4, so that is a very good sign for accuracy. 24 grains looks to be where you should be happiest if you can get things to tighten up by playing with seating depth.
It's funny, but 24 gr of powder has been a lot of high power shooters "go to" charge weight with a number of powders...
Jimro
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Machine guns are awesome until you have to carry one.
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