.475 Guy:
Both the 450 grain North Forks and the 450 grain Barnes monolithics seem to shoot about the same sized groups in my rifle and there are no keyholes.
The difference I see is that it is hard to crimp the NFs with a Lee factory crimping die because the grooves are so small, as are the driving bands between the grooves. Did you crimp yours and how did you do it?
