Originally Posted by
stubshaft
In the late 80's SAKO produced a 6mm PPC USA cartridge in a heavy barrel Vixen action. It was at the time the only factory rifle licensed and chambered for the PPC. It was designed with a .272" neck so that it did not need to be neck turned, and SAKO also produced brass and loaded cartridges for this rifle. It sounds like your model 70 might have the same style chamber.
There are, specific dies that were also produced to reload for this as the neck diameter was larger than what the BR crowd was using. That is not to say that the standard 6mmPPC dies will not work but they may overwork the brass. I have formed brass for my PPC from 7.62X39 and 6.5 Grendel brass. The 6.5 brass was a one and done deal with only a very slight change in it after fire-forming. The 7.62X39 brass was run through a Grendel die first to neck it down then through a FL PPC USA die to form, 14 grains of Unique with a tissue wad blows it out to fit the chamber perfectly. Truth be told, lately I have just bought Norma brass for this rifle and called it a day.
I will admit that although I have shot lead through the majority of my guns this one has not had one boolit down it's tube. I would imagine that the only reason to turn the neck would be to ensure that a loaded round will chamber.