Tony (Tromix) allowed me to buy a .375 reamer years ago (it is a patented round)... we built lots of guns (nothing he sold or was willing to make... i.e. why he let me buy the reamer).
I also did a bunch of .358W stuff (rented reamer).
Then I fell in love with 9,3m...
THEN... Chris and the boys discovered Arne's .375 Raptor... they went in big time (bought the reamer et al). Data is super impressive... like 10 on 10 @ 400 yards against 8" round steel. They pushed the data really hard and thus I made the 35 Whelen comparison.
I did not partake, because it was "between" what I already had.
As for feeding in a bolt gun... I forget the mag (ACS maybe... or maybe these guys (
https://hsprecision.com/product/remington-700-detachable-magazine-conversion-kits/)... I do know it was not Magpul.
If I get a chance I will ask. He may share knowledge... no promises.
He is all in on the Zeus Terminus stuff now... OCD about it actually.
I am less complicated... 700s and AR-10s... But a Savage 99 in .375R or 93Jimbo would be a blast (doubtful).
