Nice to spec neck diameter(I'd go .258" for a couple thousandths Alpha clearance),throat geometry(I'm groovin' on .090") and RPM (8" will do Winter 88's at low tide). Due the rather modest COAL with 88's,the Montucky is a fantastic Donor and I prefer it's stock ergo's to Fieldcraft,by a goodly margin.
Start talking longer cases and projectiles of greater length and the Fieldcraft STEALS the show.
Hint..............