case sorting question

C

canuck

Guest
I shoot a turn neck 6x47 lapua and I was kinda in a dilemma when it came to case sorting. After thinking about it more I thought the best way is to trim before sizing down and turning but wanted to ask the experts here.


Do you guys trim cases before weight sorting?

In your experience what is the best way to go about case sorting for something you have to neck up or down and neck turn?
 
Weighing Cases

I feel the purpose of weight sorting is to get an idea of case volume.......... for that reason.................. I weigh mine before I remove any metal........ removing metal from the outside of case...... has no reflection on volume......
I guess the best way would be to actually measure capacity individually case with liquid ....
bill larson
 
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The idea behind case sorting is an attempt to insure all of the internal volumes are the same.

If you do this by weight, logic suggest that all of the cases would have to be made dimensionally the same, or as close as feasibly possible.

So I would think that weighing after all prep work that involves removing metal would be the desired course.
 
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Jackie is right...I believe. Certainly, the best way to sort cases is by shooting. How can a case be bad if it shoots in the same hole as the others. You can sort PPC cases to any degree and your aggs won't get smaller....but if you think it helps please do it.

It can't possibly hurt anything!
 
Prep 100 cases. Fireform once. Check OAL to make sure case still fits the chamber. Fireform again then trim. Then sort by weight. To be honest, I do not sort by weight. But if I did, this is the procedure I would follow. If you are shooting a rail gun with a known accuracy potential then perhaps I would sort by weight. Just my opinion. I have won no hardware. But I have shot many 0.0xx groups and none of them were with sorted cases. It is my bench technique and wind reading ability that holds me back.
 
Thanks for the input as it gives me other things to think about. I should have mentioned this was in regards to long range shooting( 700 yards plus). I really don't think minute differences in brass has any affect out to 500 yards. I think I may test different methods at 700 yards to see if I can see any difference. Obviously I will have to wait for a day with perfect conditions.

If anyone has already done this sort of testing I would love to hear your thoughts.
 
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To get a true sort you have to do it by internal volume after forming. The extractor grooves are so different you cant hardly sort by weight alone and have it mean anything. Most use water and the same spent primer
 
Sorting by neckwall thickness runout......

.....has shown some interesting information, over the years. Weights have gotten pretty consistent.

The numbers are tenths T.I.R.

Kevin

fyj31h.jpg
 
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I was shooting a 6BR in groundhog matches, and every so often I would get a hard bolt lift. Couldn't figure out why, the powder charges were weighed. So I started weighing cases, and I was amazed. This beloved Lapua brass had many cases over a grain in weight difference. So I sorted them out, discarded the bad ones, had two different "groups" of brass. No more surprises.

I checked a new blue box of Lapua, and while by far they were quite close, there was a few that just wasn't right. I'll also add, that neck thickness isn't quite as good as some claim. Turning for a .269" neck doesn't need much removal, but you can tell when a piece has high spots with the turner held in your hand. Some don't clean up 100%.
 
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