Let’s talk load development

[tangolima]

Originally Posted by tangolima

50% group 0.61moa
90% group 1.12moa

Not quite submoa yet, but very good already.

-TL

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If you fire a lot of shots, 50% of them are expected to land inside a circle around the group center with diameter of 0.61moa. 90% of the shots are expected to land inside a circle with diameter of 1.12moa.

The 90% group size is close to the extreme spread group.

-TL


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[tangolima]

Originally Posted by Metal god

Can you explain to me what that means? What’s good or bad about it? I just don’t know what the significance of those numbers are .



I was listening to a podcast of guys talking about why mean radius is good . They were talking about shooting 30 shot groups in 10 shot increments letting the barrel cool in between 10 shot strings. They shot two separate groups of 30 and both groups add statistically the same group size of 1.4 moa . However, the first 10 shots in group A shot .6 moa and the first 10 shots in group B shot 1.4 moa . I thought that was interesting , they said the mean. Radius of group B ultimately ended up being the better group. And is the point of my question. If both group groups ultimately ended up at 1.4 MOA. How is the main radius different?

Mean radius method is better than extreme spread because every shot contributes to the overall statistics. More shots you fire, more accurate the results will be.

I don't care about splitting hair on subgroups. If it is up to me, all shots should be counted as one big group, as long as the load is the same.

For instance, I plan fire 30 rounds. I can fire them in one go, just like the Preston guy on YouTube. If I want to keep barrel from overheating, I could fire 10, take a break, fire another 10 etc. But I will count all 30 as one group.

If I want compare different loads, I fire say 10 rounds of each load, and compare their mean radii.

-TL

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[stagpanther]

Mean radius method is better than extreme spread because every shot contributes to the overall statistics. More shots you fire, more accurate the results will be.

^^^^this^^^^

As opposed to the much more common CTC ES; which really accounts for just the two shots that are furtherest apart. So the mean radius weighs the result more "democratically" by accounting for the contribution of every single shot in the group instead of just the two ES shots.

[Metal god]

Thanks TL that’s helpful

[tangolima]

Originally Posted by Metal god

Thanks TL that’s helpful

No sweat. Neck turn already!

-TL

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