John. I agree with sorting cases while shooting. For instance in good conditions practicing if a shot goes out for no reason then I toss the case. This is in my 32 Miller as I have on hand 300 ea ready to use. After sorting by shooting method I have reduced the number of those "funny shots"

Holy scotchbrite pads! If I tossed a case everytime one went out, I'd be outta the shootin' racket in no time. 
But, when I get a bum shot from now on, I can shake my noggin and profess another case has gone sour. I'll sound so fu..... doggone wise to the fellow next to me with the AR-xxxxxxx. 

I did a lot of load testing with a 22-250 some years ago and found that cases with turned necks produced a different shaped group from unturned.  I have no way of telling if it is where the pressure acted on the base or if it produced different harmonics, but the groups were significantly different in shape.  I ended up turning the necks of my 40-50SS cases made from 30-40 brass to get a proper fit breach seating. I can’t comment on accuracy but the cases fit good and have lasted many firings.  I believe that it is a technique worth trying.

I have never neck turned any of my cases i always thought it was un necessary. I will admit that i file a v groove in the rim of all my cases. When I load the V groove always goes to 12:00. 

40 Rod

Thanks Keith and I do appreciate your input as it appears to be new to some of the good folks here and indeed valuable information. When you were shooting Jacketed Benchrest would you have to do the same shoot and sort or does it seem to be more related to breech seating based on your long term experience. I do know it was very common in Heavy Class CBA but by using a single case for the match not multiple and I have seen several tossed to find the match quality cases but clueless when it comes to Jacketed. I should add the 30BR cases used in Heavy Class CBA were properly prepped, neck turned, primer pockets uniformed etc, etc. before being fired and sorted. 

JLouis

40_Rod wrote on May 25^th, 2018 at 8:42am:


Do you also orient the groove to the resizing die?

Cat_Whisperer wrote on May 25^th, 2018 at 7:25am:

I'll probably have to settle for orienting them nose first 

BobZ I always index my case so I have never spent the time and effort to go out to try to find one that might not require my doing so, so should I have one I really cannot honesty say one way or the other. I also and a quite common practice index the bullet and I also and not a so common practice index the primer as well.

JLouis