First, when working up loads, I test at 100 yards and only on a calm wind day. I usually load up 6-8 of each load. 3 at 100, and 3 at 200 yards. If both look good, I know that load has promise and never time will load up 12-20, and shoot several groups. I do the 100 yard/200 yard work up only with scoped guns. Iron sites, get tested at 50 yards. Pistol loads get tested at 25 yards unless thats scoped too.