I like most have typically tried incremental charge tests and just looked for the best grouping without placing much importance on POI relative to other charge levels; in other words judging each charge on its own group size only.
I shoot mostly between 100- 300 yards in doing my tests and just casual shooting practice. But I can go to 400 without too much trouble and 600 if I drive a while.
I have inadvertently stumbled across what Dan Newbury says about the POI of a string of charge weights. Also, I have seen where a tight ES & SD on the chrono doesn't necessarily correlate to a tighter group, though of course a very wide ES & SD lead to large groups at longer distances.
I have also noticed the correlation of a "favorite" velocity or velocities of a gun. Gee, wouldn't it be nice to be able to load up to a certain velocity regardless of bullet type or weight, and always have the same level of accuracy??!
I am currently setting up to do a strict OCW sequence at 100 yards. I'm using a powder/bullet combo I've already experimented with and know can hold low velocity variations for starters. I will chrono as I go along. It seems to me that if the OCW I find also shows a low ES and SD on the chrono, it should be good at much longer distances and result in what Jason Baney calls the "accuracy window"....We'll see.
Originally Posted by Engineering101
It does take some experience to figure out what really matters but that, of course, is half the fun. Good luck.
As in life...+1 on that.