You use the one that matches the bullet diameter. I would assume in this case 6mm or .243.
Lfcd shouldn't contact the shoulder, but cartridge/case height does matter--- have you tried shooting your reloads before crimping? Many times rifle ammo is more accurate when not crimpedSo the shoulder doesn't come into play?
This was my concern that it might make a difference.
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you using bushing dies from ch4d? if so try 1 size smaller bushing--or try annealing your brass after the 2nd or 3rd firingYes I haven't crimped any of my 6x6.8 but I'm using ch4d dies and my neck tension seems to be very light no matter what I try
on some 3-4 times fired brass.
It would t be much just enough to hold it in place.
Thanks.
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