Dave: you can start at 70 grains, and it may be all you need for all your shooting. But I think you'll find that your groups will shrink with 75 gr. and perhaps a little more with 80 gr., especially out past 50 yds. You may find your most accurate shooting with up to 100 gr. FFg, but don't rule out FFFg either. Perhaps more important than the quantity of powder, is the quality of the patch. Were it I, I'd not use anything thinner than .018" compressed in the thin part of a Vernier's calipers. This compression is what your rifling does to the patch, so this is the measure. You will likely settle for a tight cotton weave that measures between .018" and .022". Make sure the patch is soaked to the point of dripping when you start your ball. This way, you'll load all day without effort, and without having to wipe. And your accuracy will be consistent throughout the exercise. I have noted that others mileage varies, but only here occasionally on the ALR, and those standing outside the winner's circle at matches.
