You have a blank? Hit up Manzella Precision, he has a very nice 0.190 freebore 25prc reamer that plays very well with the heavy Berger and eldm. He can prefit newer igniter, bumblebee, Vesper actions.
Pretty sure Defensive Edge Rifles has a 25-6.5 PRC reamer. Shawn has some of the fastest turn around times of anyone I’ve ever used. Don’t know about chambering a prefit but if you call him he’ll give you a straight answer.
Kampfeld Customs is another I’d call. Karl’s a great guy, does very good work and also has super fast turnaround times.