Big Stick, Mr. Nobody, get yourself a lathe as fix those factory belted magnum headspace jobs to fit the brass.
$5k with DRO and 50 sq ft of shop space... you can do it.
Having a machine shop is like having a microwave. You will not be able to live without it.
I'm spread thin,with pursuits of interests as is...and only get 6 months of vacation a year.
No thang to initially reap finite headspace control on belted hulls,at the reloading press and do so throughout the life cycle of said Lot of brass/ammo.
Hint.....................
