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Gidday all - I have some questions on statistics especially around velocity SDs that I need to discuss prior to designing an 22 lr ammo experiment. I'm a Bloody slow typist so really need to talk with someone . . . Anyone strong in statistics on here with half an hour to spare? PM me you number and a suitable time to call. Ta
Take a look at theses series articles by my old mentor:
Velocity dispersion in rimfire groups
Nice article all right, much to digest. This thread is also pretty interesting https://www.rimfirecentral.com/threa...project.99009/ if a little less academic.
I will soon have three dead modern rifles with 20" hammer rifled barrels and pretty good to outstanding triggers. Of the three one is a proven consistent sub 0.3 at 50M performer, one with a bit more practice will make 0.4 and the third is yet to be tested.
I have a range of ammos 2nd tier like Eley Club, with a wee selection of top shelf ones and the old standbys like CCI SV ( new stuff and the Hornady boxed stuff). I'd like to shoot 30 rounds per rifle, chrony every shot and "shoot for score" probably using a 30mm bull on a 100mm gong at 100M and maybe 200M using a 80mm bull on a 200mm gong. The aim of the exercise being to compare how many misses the cheaper ammo will cost you gong shooting at longer ranges.
I've come to the conclusion that shooting high performance 22s at 50M doesn't tell you enough . . . And I have 8 spare weeks now
150m + will start to show the differences in accuracy of the different ammo types, CCI std vel still shoots well at 100-150m but really starts showing high/low fliers after that.
Your chronograph will show which ammo is the most consistent ES/SD wise. I'd try for groups at 200mm if you can wait for good weather, if not 100m an chronograph data will be good enough.