I'm no expert here. Things I've found that do improve my old bolt shooters are neck sizing. Either by using a Lee collet or if one is not available then using a full length sizing die backed out so only the shoulder is being "bumped" slightly while the actual aim is sizing the neck for bullet fit. I've never heard of using the Collet and sizing die/body die together.Horseman wrote:.... "Bumping" the shoulder a couple thou using a standard size die (brass from my rifles) to me is just to make sure the round will chamber easily and not "over work" the brass. Am I missing something here? My limited knowledge has me thinking that using a body die in conjunction with a neck die like the Lee collet die would really be the ticket for the utmost in accuracy, providing "proper" brass prep is done.
As mentioned in the video the reason neck sizing works is because the fireformed case (especially the shoulder) fits precisely in the chamber and can't "flop" around.
So you see I don't know enough to a answer you question. Hopefully someone way smarter than me can give you some actual advice.