Greetings Rated M for Magnum,
Looking at your three groups with the one called flyer Your rifle is delivering excellent accuracy. I wouldn't get too hung up on on Extreme Spread or SD, it is accuracy that you should be looking for especially at longer range. I assume that you will test the loads at least at 300 metres. One three shot group is not enough to draw any conclusions but the three groups averaging well under 1 MOA are. Pick any one you want.
Regards Grandpamac.
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