Re: powder choice
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Given 3 powders exhibiting similar accuracy; why not pick the one that produces the highest velocity (if thats important) or the the powder that produces the lowest standard deviation? Personally, I always look for low SD in the endless search for the perfect load.
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BINGO! That is the best recommendation. The powder giving the most uniform velocities is always first in my book. Accuracy needs to be there too but that can come from tweeking seating depths, changing bullets, or shooting the same bullet farther out to see if accuracy improves. If the velos aren't uniform, you ain't gonna shoot long range too well.
If it's not far, it's boring.