Recent content by stats_guy

That would be approximately the mean radius of a normally distributed vertical dispersion with an SD of 9 fps at 125 yds.

0.08 MOA sounds like the vertical spread at 125 yds caused by 35 fps of velocity spread, not the group size.

One thing worth discussing is zero uncertainty - i.e. how far off the true zero (population mean point of impact) is likely to be from the center of your group (sample mean point of impact). There was a recent Hornady episode on this topic that does a great job explaining it: EP 198: Is Your...

would you call all of these things harmonics? Everything is Vibrations man, you gotta align your frequency with the universe

hella assumptions about people's political affiliations there lol

Technically every outcome has a cause behind it. If you get really into the weeds of internal and external ballistics, there are theories that attempt to explain why bullets don't go into the same hole every time, even when you take shooter error out of the equation (like when ammunition...

Yeah, I have nothing against those chasing perfection. If I was trying to squeeze the last bit of precision out of my rifle, my approach would be different from most (as you can probably guess), but I do see how the process is appealing to some. There are some PRS and F-class competitors who do...

I like to separate the inherent mechanical precision (the "cone of fire") of the rifle-ammo-shooter system from the other variables that cause lower accuracy at long ranges (velocity, environmentals, etc) to avoid muddying things up. So I shoot groups almost exclusively at 100 yds where I know...

Well.. the same rules of statistics apply to handloads as well, we're not magically exempt from them! My handloads do in fact shoot better and with a more consistent velocity than factory match ammo, but I recognize that random dispersion still exists. One of my rifles averages 0.5 MOA 5-shot...

Hey, there's something we can agree on! Using statistics definitely does not replace time at the range actually practicing, and it's not a substitute for good, consistent reloading practices. It's a tool that, when used to your advantage, can help save some frustration and maybe some time and...

here we go again... It's clear that these discussions are not productive, but I'll just leave with this. These basic concepts in statistics have been known for over 200 years and are used in every type of industry. They are as objective as you can get, and they're easy to prove by running...

I think any thread about tuners was going to devolve into personal attacks at some point.. so this is not too surprising lol

How do you conduct this testing? Discerning a real difference in precision between two loads with a reasonable amount of confidence takes quite a few shots. Here is the expected range of group sizes (green) from a rifle that shoots 0.5 MOA 5-shot groups on average. Without changing any variable...

Are these results repeatable across multiple tests or large samples? I won't claim that seating depth has no effect at all, but Berger Hybrids are generally known to be not sensitive to jump. This has held true in my testing with 6mm, 6.5mm and 30 cal bullets across several of mine and my...

The authors of this study attribute those deflections to the design of that rifle where a low-stiffness gap existed but was not modeled in their FEA. The actual barrel vibrations from modal testing matched the FEA results, and those were ~20x smaller. OBT theory is one of those things that...