Throat / barrel dimensions

[bigted]

I agree completely but two of the important accurizing factors that occurs with chamber reaming is uniform diameters and round holes. Neither seems assured from the factory.
Also, when one reams chambers they do not need to be reamed to the bottom of the chamber. I feel it best to leave as much steel over the bolt cuts as possible.

Yes I agree. Matter of fact going much further down than a ball diameter gains not much. Going to desire the ball to be up at the cylinder mouth anyway. Maybe far enough to seat the conicals to proper depth as well.