As above.

I used to test myriad bullet/ powder combos, looking for accuracy. A waste of time, in my opinion.

I take my preferred bullet, usually a Nosler Ballistic Tip, and choose the CORRECT powder (the one or two, that give the highest velocity, with the least pressure) for the load/cartridge.

Simply varying the seating depth, will give you much increased accuracy without screwing with a lot of different combos. I usually vary by 0.010 or so, to find that "sweet spot".

As often, as not, a longer jump to the lands, gives you the desired accuracy I seek.

I have MANY different rifles/calibers. This has never failed me. You DO have to start with a quality bullet, such as the Nosler BT.

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NRA Instructor