I will soon be starting another project, a .338-300RUM. I will be purchasing the reamer myself and was curious if you guys could give me any direction on throat diameter, length, and angle. I am planning on having the neck diameter be somewhere between .362"-.360". OH! should the neck be tapered toward the case mouth? If so how much? Will be using either the 250gr or 300gr SMK. Rather go with the 300gr.