Originally Posted by j-man
A load that performs well at 100 that has high es/sd numbers will perform poorly as you reach further out.
This is why it is not only important for a load to be accurate at short range, but consistent enough in velocity to be accurate at long range.
'Tain't necessarily so.
Years ago, when several of us developed the load for Sierra's 155-gr. Palma bullet in the .308 Win. case, the load that the lab tested and produced the lowest spread in muzzle velocity and peak pressure was the least accurate of a couple dozen loads tested. The one we ended up using had a little less than average numbers for velocity and pressure, but it was the most accurate. Shot well under 4 inches at 600 yards in spite of 3/10ths grain powder charge weight spread.
Lake City Arsenal's M852 match ammo with Sierra 168's had about 42 grains of IMR4895. They used a charge weight that produced best accuracy within pressure and velocity specs. And best accuracy didn't always have the lowest spreads in averages for these two things.