Originally Posted by Max Heat
The sizer die IS adjusted ALL the way tight (tight-is-right). Shell holder plate thickness does NOT matter.
Uhhh... yes it does. If you lap the top of the shell holder off, you can screw the die down farther and bump your shoulder farther. That said, you can screw down your die another 1/8th to 1/4 turn after your die is bottoming out on the shell holder. If you still aren't getting them to chamber easy, then I would recommend shaving either the bottom of your die off or the top of your shell holder. I prefer doing the bottom of the die.
This isn't that umcommon with tight custom reamers. I just had to have 10 thou shaved off the bottom of 3 of my dies (for 2 rifles) shaved off and one of them I am still camming over 1/8th of turn.
Other question I asked was, will shooting the still-tite-after-sized cases out of the new barrel fire-form them "down" to a not-so-tite fit the next time through, after they are sized and loaded again?
Or can I expect that those cases to ALWAYs be tight, in the new barrel?
As previously mentioned, I would FL size them down until they fit the new chamber. Then I would anneal them and size them again. Do not mix old brass fired from another rifle with new brass. Bad juju. It will shoot, but you might not like the results.
The RUMs are wild critters and the available brass sucks. I am getting some Bertram made 338 EDGE brass for mine.