The gains beyond my method are to be made in careful process and better components and reloading gear. My method got me to 2x loads (2 different bullets) produced 0.6/0.7 moa groups this week, with no tuning, totally random loads, mixed lot un-prepped PMC brass, old stale powder, charges weighed on a chargemaster, loaded FL sized from cheap hornady dies, shot from prone in the gravel in strong mirage on a bipod and lightweight rear bag with a hard hold in an 8lb rifle with a 2lb trigger. Oh and it took 20 rounds and about 20 minutes.
If you want good groups get a better barrel and get good bullets and brass, the precision just happens
If you want better groups than that, you're wasting time unless shooting BR, but you'll probably want to get very particular about brass prep and charge weights
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