Thread: Zeroing - Help! (Real accuracy and precision)

Originally Posted by davetapson

Ha - this is interesting.

Ok, I'm at the tail end of a visit from the virus that must not be named, so maybe not so sharp...

If:
1. small number of shots groupings (say three) can lead to misleading MPOIs
2. and there must be a diminishing return on number of shots per grouping vs true MPOI after some threshold value e.g. is a 1000 shot MPOI that much more accurate than a 500 shot grouping vs a 250 shot grouping vs a 100 shot grouping vs 50 vs 25 vs 10... etc.?)

So, is there a point where you could say: look, after a x round grouping, you're beginning to waste ammo? Statistically speaking, not huntingly speaking...

10? 20? 30?

Watch the hornady podcast "your groups are too small" and "Your groups are still too small" effectively it takes a sample size of 30 to create a normally distributed data set. But they go into for example what the typical range a 3 5 10 20 shot groups would likely convert into. They also talk about using mean radius which is slightly more helpful than groups size as groups size only considers the 2 most extreme shots whereas mean radius considers every single shot so they data is better if you have a small sample size (still not great). Watch the video it's more helpful as has visual demonstrations and also it references the group analysis tool in the hornady app that will calculate mean radius etc. Also if you keep track of the mean radius of multiple groups you can use all that info to work out a 30 round or more group even if say it takes a bunch of sessions.