The Precision rimfire thread

[Ultimitsu]

The journey has taken several rifles, a Anschutz 1415-1416, a Winchester M52 replica, a CZ 455, two EM322's, a Ruger 10/22 HB, a Ruger American rimfire Target HB and some others I forget. All of these would shoot a lot of groups at under 0.5, but in my hands I couldn't get 5 consecutive groups at that level.
Attachment 182476

5 shot group is not an accurate measure of accuracy. first shot doesn't count, it really is 4 shots being consistent to the first.

Many rifles can do a 5 shot 0.5 inch here and there, but will have a larger true cone of spread. That is what is good about this challenge, it basically ignores these one-off good 5 shot groups and make your gun show its true colours.

5 shot group gets used as a default accuracy measurement because a balance needs to be struck between precision of measurement and cost of measurement. 10 rounds of quality factory load 6.5 Creedmoor would cost about 40-50 dollars.

however when it comes to rimfire, I don't see why 5 group shots should still be used in accuracy discussions given the low cost of ammunition. I think at a minimum 10 shot should be fired before concluding accuracy.