all those groups shot at 100?? honestly they dont tell you, or us any thing much 100 is far to close to be developing a load, personally i would ladder test at 4-500 yds, find the ranger that the vertical spread planes out for loads xyz and devolope from there.
there is some good reading on mysticprecissions website about ladder testings..
all 100 yds does is show human error and good 100yd loads