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Bart B. · February 19, 2013, 02:31 PM

603country, three shot groups have a 15% to 20% chance of representing what a 50-shot group will.

Shoot more shots per test group; at least 10, else your data's not statistically significant and far from being what's good to make decisions on.

If you still think 3-shot groups are good enough, prove it by shooting 5 of them with the same load. Then let me know which one you pick to represent the accuracy of that load.

Basics of testing ammo: if all the groups shot with a given load are different sizes, you're not shooting enough shots per group to get meaningful info on that load.

February 19, 2013, 02:31 PM	#2
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	603country, three shot groups have a 15% to 20% chance of representing what a 50-shot group will. Shoot more shots per test group; at least 10, else your data's not statistically significant and far from being what's good to make decisions on. If you still think 3-shot groups are good enough, prove it by shooting 5 of them with the same load. Then let me know which one you pick to represent the accuracy of that load. Basics of testing ammo: if all the groups shot with a given load are different sizes, you're not shooting enough shots per group to get meaningful info on that load. Last edited by Bart B.; February 19, 2013 at 02:37 PM.