ES vs accuracy

[Rhovee]

I have shot many of groups in lots of cartridges while keeping track of velocity. I have also noticed that the absolute lowest ES is rarely the smallest group. Most of mine end up in the 15ish area. I mostly keep records for temp stability of the combination I am shooting along with when the barrel speeds up. Things change constantly to keep rifles shooting really small. It's more important to me that a rifle will shoot from 200 feet to 7000 feet and 70 degrees to 15. That seems to have more of an effect than ES of an unstable powder across many states.