Thread: Getting good data from 3 shot groups

Following on from this thread https://www.nzhuntingandshooting.co....llenge-119262/ I've been giving some thought as to how to best use 3 shot groups / minimum rounds to get a very precise zero.

So a very quick trip to the range today - I fired 13 shots and gained a heck of a lot of very usefull data, certainly enough to shoot to at least 500 or so with a lot of confidence. To achieve the 500 confidence you really need a scope of known dialing capability, old or very cheap is probably gonna disappoint.

So I fired 13 rounds total, shooting at 3 aiming points. Shooting was done "round robin" so one shot at each aiming point rather than 3 all at once at the same aim point. This rifle was already zeroed but had been shooting horribly (like 2+ moa) so it was deep cleaned for this test . . . So a cold/clean bore shot is included.

Here is a picture of the target after 9 rounds, at this stage I have three groups each of 3 shots.



This rifle is shooting pretty well and it's tempting to call it done but for the sake of a few more rounds we can get a lot more info by firing 4 more rounds and converting two groups to five shots.



The analysis is in the photo but I'll add some comments soon.