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by kmitchl
Fri Feb 23, 2007 9:25 pm
Forum: Reloading Forum
Topic: Standard deviation
Replies: 4
Views: 1303

I rely on standard of deviation to evaluate pistol loads. If you have a SD of 10 this means that statistically 68% of the velocities for that load will be within +/- 10 fps of the average. If you expand the range to 2X the SD (+/-20 fps) 95% of the velocities will be within that range. Although not the only criteria, I generally look for a SD of less than 10 when evaluating pistol loads.

The other way is to shoot from a Ransom rest so the accuracy can be accurately measured.

Keith

Return to “Standard deviation”