All my 1k competition loads were worked up at 100 yards thru a chrono. A one hole group was less accurate versus a larger round group at 1k. If a bullet is stable for one hole groups at 100 yards, is it still stable at 1k? I thought not. The lower the SD the better. 240 Mk at 2985 SD of 3 was a winner all day. Take 2 or 3 best loads and verify at 1k early morning before the thermals get too bad or right before a storm. Wait for it to lay down is my point. Albeit I shot from a bench same should apply for all platforms. Just my .02
Rich
How many shots do you use to establish an SD estimate?
