Tozguy said:A collet die that does a good job on 6PPC can not do the same job on a 6BR. The necks of the two calibers are not the same distance from the base. By calculation, a 6 PPC collet would size around .018'' of the shoulder on a 6BR. This is not to say that it does not 'work' because the sized 6BR case would hold a bullet and be usable. A shim of at least .018'' should be used over the shell holder to get the best results on 6BR with a 6PPC collet. Considering the reasonable cost of buying a custom 6BR collet die from Lee I would not buy a 6PPC collet die with the intention of sizing 6BR.