I started this thread in May with a home made neck die.
Afterwards, I ordered and waited for the $430 pair of reamers from Manson ; a) chamber reamer and b) sizer die reamer.
I got 4140 die blanks from PTG.
More work was cutting the Mosin extractor relief cut on the Lilja barrel.
I put the barrel in a rotary table. The reason the Mosin extractor is so narrow, is the bolt rotates 90 degrees, and the rim needs support for more than 180 degrees to stand up to the firing pin force without tipping..