Quantifying inherent accuracy ?

[Brians356]

PS You will need to provide the documentation for the Bill Calfee test project, I am not privy to it. I would love to dig into it, seriously.
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[sparker]

Design parameters for accurate cartridges: case volume not to exceed 1/3rd the weight in grains of water of the heaviest bullet to be fired from the case. Neck length of at least one caliber, 30-40 degree shoulder angle, minimum body taper.

 

[Brians356]

Design parameters for accurate cartridges: case volume not to exceed 1/3rd the weight in grains of water of the heaviest bullet to be fired from the case. Neck length of at least one caliber, 30-40 degree shoulder angle, minimum body taper.

That helps explain the accuracy of my 250-3000 AI (and the 6.5 Creedmore which is a virtual clone).
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[Auto-X Fil]

In many cases, "inherently accurate" means "forgiving to load for".

The main attributes are easy to see. What do the 6BR, 6.5x47, and 300 WSM have in common? Sharp shoulders, short and fat cases, moderate capacity for the bore size.

Some other features can be tough to define. Too long of a neck can be bad. Too short might be worse. Primer size matters.

 

[gunsandgunsmithing]

Sorry , as close as possible , read his testing , very good reading before you nix the proven concept . Same barrel same receiver same bullets etc all done by a proven riflesmith .
No to the 222 , not since the pPC

Nope...

"Strongly suggested most accurate."



Are you sure? I believe there's still one particular record held by the 222 Rem, one of those flukes unlikely to ever be bested. I believe it is a ten-shot group. Guys, help me out here, I am not a competitor or BR historian.
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...and nope. The 222 held the world record for smallest 5 shot group at 100 yards in any registered match for over 40 years. The ppc was around for most of that time and never beat it...in tens of thousands of attempts. A 30 Major (Grendel) beat it only a short while after being introduced.---Mike Ezell

 

[OmegaRed]

sub for later

 

[Brians356]

The 222 held the world record for smallest 5 shot group at 100 yards in any registered match for over 40 years. The ppc was around for most of that time and never beat it...in tens of thousands of attempts. A 30 Major (Grendel) beat it only a short while after being introduced.

Wow!

Well, both the 222 shooter 40 years ago, and the 30 Major shooter could probably try again 10,000 times and not duplicate those groups. Still, too bad the 222 is all but dismissed nowadays.
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[gunsandgunsmithing]

Wow!

Well, both the 222 shooter 40 years ago, and the 30 Major shooter could probably try again 10,000 times and not duplicate those groups. Still, too bad the 222 is all but dismissed nowadays.
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Maybe..but that's speculation based on averages. Facts are facts though, whether we like it or not.
The subject is inherent accuracy and cartridge efficiency. The small 30's excel here.

 

[Brians356]

The subject is inherent accuracy and cartridge efficiency. The small 30's excel here.

I am not up on equipment lists, do the small 30s now dominate the line in BR matches?
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[gunsandgunsmithing]

I am not up on equipment lists, do the small 30s now dominate the line in BR matches?
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Depends on which br discipline....The 6ppc is most popular in group and the same for the little 30's in score. As long as we're staying off the subject of the thread..do you wish to discuss which is tougher...group or score, too?

 

[Brians356]

Depends on which br discipline....The 6ppc is most popular in group and the same for the little 30's in score. As long as we're staying off the subject of the thread..do you wish to discuss which is tougher...group or score, too?

Discussing 6mm vs 30 cal, and accuracy competition, is off topic of "quantifying inherent accuracy"? You might be onto something, especially since I already summed up the matter advanced by the OP, and repeat it again for you:

"There's no way to prove a cartridge or cartridge family is more accurate, there are too many variables, and too many chaotic perturbations. It's a multivariate chaotic system." Q.E.D.

Which is another way of saying that inherent accuracy cannot be reliably quantified, otherwise one could reliably classify cartridges by inherent accuracy. You're quite right to hint (in your subtle way) that poring over equipment lists and match results is no substitute for actually quantifying inherent accuracy. Kudos!
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[gunsandgunsmithing]

Discussing 6mm vs 30 cal, and accuracy competition, is off topic of "quantifying inherent accuracy"? You might be onto something, especially since I already summed up the matter advanced by the OP, and repeat it again for you:

"There's no way to prove a cartridge or cartridge family is more accurate, there are too many variables, and too many chaotic perturbations. It's a multivariate chaotic system." Q.E.D.

Which is another way of saying that inherent accuracy cannot be reliably quantified, otherwise one could reliably classify cartridges by inherent accuracy. You're quite right to hint (in your subtle way) that poring over equipment lists and match results is no substitute for actually quantifying inherent accuracy. Kudos!
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Thank you..You're right and I'm wrong. Not sure I ever said that you can quantifiably pinpoint which is most inherently accurate, but that there are general indicators relative to case capacity to bore ratio, and that ironically enough, a cartridge that would be tops on the overbore comparison chart mentioned earlier happens to also hold the record for smallest 5 shot 100 yard group. Good day and happy 4th.