Will Mcgowan do a 45 raptor barrel?
For some reason the 45 raptor creator thinks it is illegal to import the brass to Canada though; he will not even do it through legal channels.
NO reamer and if called the 45 Raptor... no as it is likely trademarked and proprietory. And I hope you saw this is based off the 452" HG bullets? OP is asking for 458 bullets.
Personally, I am not a fan of headspacing on a case mouth for high pressure rifle cartridges. You could form from conventional cases but a real pain as you have really nothing to chamber against so blowing out the case will get very interesting.
The 45 RAPTOR is a NO TAPER case... that can lead to a litany of issues wrt to chambering, extraction and headspacing.
This concept is most certainly not new.... Personally, since this is all about a "working" rifle, function above all else would be paramount to me. Positive headspacing so the cartridge always goes BANG is kind of important. As is getting the empty out and a new rd in.
The 450 Bushmaster is simply this wildcatt with a wider TAPERED case WHICH will allow for positive indexing. So why not just go with something that is supported by Hrn and there is load data , dies and brass... ammo too?
The 458 SOCOM uses 458" bullets, has a shoulder and supplies..
I would use a case with a shoulder, rim or belt long before trusting a bullet crimp to be perfect in headspacing a cartridge. And I would choose a cartridge with industry support over a 1 off that already has some design features not giving me a warm fuzzy.
Jerry