For accuracy you want low es (extreme spread) and sd (standard deviation) numbers....means the rounds are launching at the same speed..within a fps spread.....for long range, it may not effect your horizontal spread, but a big difference in sd or/and es will show up in your verticle string.....What most of the bench shooters look for is 15 fps or better es.....sd around single digits.....hope this helps...also, when working up a load, you'll hit a point where more powder doesn't raise FPS...but does pressure...means you need to back down a little to hit your accuracy "node" (sweet spot)....rsbhunter