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Best way to sort brass?

 
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  #15  
Old 07-10-2013, 08:01 AM
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Re: Best way to sort brass?

Quote:
Originally Posted by Pieter Willem Vorster View Post
Bart B, thanks for responding, but my question is not answered.
Is this your question?
Quote:
If this is true, it is only necessary to sort a batch of cases by weight and not by volume.
Is there anybody with more knowledge about this who can sceintifically confirm my view?
I've shot sub 1/2 MOA (under 5 inches or 12.7 cm) 15-shot test groups at 1000 yards with two different 30 caliber magnum loads using cases sorted to a 1% spread in weight about 230 grains.

And 20-shot group at 800 yards under 4 inches (10.2 cm) from a .308 Win. with cases sorted to a 1% spread about 157 grains.

The most accurate (smallest) string of 10-shot groups ever made (as far as I know) were done with cases sorted by weight to a 1 grain spread of .308 Win. cases averaging 150 grains. Several groups were all under 1.5 (3.81 cm) inches and the smallest down to about 0.7 inch (1.78 cm). And a 40-shot group measured 1.92 inch (4.88 cm).

This is as good as anybody has shot anything with anything sorted anyway for the numbers of shots fired. I make no claim that it's scientific, but it's pretty close to being so.

Personally, I think it depends a lot on how one tests the results of different case sorting criteria. Some folks will get good results with any method.
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  #16  
Old 07-10-2013, 08:29 AM
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Re: Best way to sort brass?

Actually my question is: "... if you have two cases, A and B, with the same outside dimensions and made from the same alloy, and the weight of A=weight of B, the volume of A=volume of B."

Is this true?
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  #17  
Old 07-10-2013, 09:03 AM
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Re: Best way to sort brass?

I just went through a situation with my 260 which I used Lapua brass. Norma brass was within 2 graings wt. the Norma case was 1-2 thousandths smaller above the base. Velocities, POI, and accuracy o.25-.36 MOS was identical for both fired and new brass.
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  #18  
Old 07-10-2013, 04:59 PM
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Re: Best way to sort brass?

Quote:
Originally Posted by Pieter Willem Vorster View Post
Actually my question is: "... if you have two cases, A and B, with the same outside dimensions and made from the same alloy, and the weight of A=weight of B, the volume of A=volume of B." Is this true?
Yes. With equal amounts of brass, the volume of each is equal. The less brass there is inside the chamber, the more room there is for powder. At peak pressure when the case is pressed hard against the chamber and bolt face, lighter cases have more space inside of them.

Some folks feel the case volume before firing is more important.
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  #19  
Old 07-10-2013, 06:42 PM
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Re: Best way to sort brass?

Quote:
Originally Posted by Pieter Willem Vorster View Post
Actually my question is: "... if you have two cases, A and B, with the same outside dimensions and made from the same alloy, and the weight of A=weight of B, the volume of A=volume of B."

Is this true?
Generally yes, provided your using brass of the same make and lot. Other wise you can run into variances in the head of the case which "can" throw things off. Just like everything else with reloading "It Depends" is still a best fit answer
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Joe
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  #20  
Old 07-10-2013, 10:32 PM
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Re: Best way to sort brass?

A while back I did a small test with a small sample of twice fired, cleaned, sized & trimmed cases.....The weight vs volume test was done on the heavy three & light three cases of a 50 case lot with 3.5 grains of extreme spread....

These were Remington brand 25-06 cases expanded and fire-formed to 6.5-06....Volumes decreased in 5 of the six cases as weight increased (as expected)...With one exception the heaviest case had more volume than the lightest case!....I checked this three times....My conclusion was the brass distribution within that case was quite different than the others....In other words the internal shape may vary even in cases that weigh the same...As an after thought I wish I would have "sliced" the two extreme cases lengthwise and made measurements....

Granted this was one test and one instance but may be another reason to explain unexpected "fliers"...Even in complete volume tested cases....I would also have reason to believe that manufacturing processes could explain what I found and that "better" more expensive brass could have a better handle on this.....

Personally I normally weight sort only after two firings and sizing, cleaning and trimming...plus or minus 1 grain...But my best sorting method is"placement in the group" during a session at the range using a sharpy on any suspect case heads and watching them on subsequent firings....Twice out of the ordinary unexplained results usually get them booted....I had at one time an electric tool etcher that I numbered every case in a lot....It was a lot easier to keep track of "bad eggs" back then...Maybe I should buy another one...

My $.02,
Randy

Last edited by MNbogboy; 07-10-2013 at 10:35 PM. Reason: sp
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  #21  
Old 07-10-2013, 10:45 PM
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Re: Best way to sort brass?

Quote:
Originally Posted by MNbogboy View Post
But my best sorting method is"placement in the group" during a session at the range using a sharpy on any suspect case heads and watching them on subsequent firings....Twice out of the ordinary unexplained results usually get them booted
Is your rifle's bolt face squared up with the chamber axis?
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