Originally Posted by dskd
What must be done to get a standard deviation of less than 10 fps ..... ?
What is your acceptable SD?
What SD is considered maximum for competitive target rounds?
What SD's are accepted as competitive by prescision benchrest shooters?
rounds are 308 and 338lm
Q#1. Everything and nothing. Having brass prepped perfectly, the powder trickled to the .1 grain, perfect neck tension, primers seated consistently, and a myriad of other things certainly help get low SD's but sometimes, just having the right amount of the right powder in the case with nothing else done at all will yeild small SD's.
Q#2. 10 fps or less.
Q#3 and 4. Same as Q#2 except for close range BR. In that sport, we don't care if it is 100 fps as long as the group is tight.