I am starting my first wildcat project. I am having a fully chambered 7mm-300wsm being built and I want to neck down 300 wsm cases to 7mm (this is not just prepping 300 wsm brass to eventually fit a 7mm wsm). My usual new brass prep (not specifically in this order but...): Norma brass preferred, winchester as a last resort sinclair expander mandrel flash hole debur sorting by neck variance (keep cases with < 0.0015) weight sort (remove top and bottom 5%) neck turn to uniform neck thickness resize primer pocket uniform trim to uniform length outside debur polish w/ 0000 steel wool I need input specifically regarding: Should I neck turn the 300 WSM, followed by necking down to 7mm OR Neck down the 300wsm and then neck turn the 7mm after case forming? I will be using redding S type FL sizing dies w/ bushings. What increments should be used to minimize work hardening? Neck ream to minimize doughnut? When? Since this cartridge is not uncommon, any help/experience is appreciated.