The cone make feeding like butter.
There is still the partial ring at the bottom. I have never done a remington without the counterbore. You would lose .150 of thread length on the shank and it needs all it can get. The one in the picture is exact spec for a GRB action but looks real similar to how I cut my remingtons. The GRB bolt nose looks like a remington, it's not a 30 degree coned bolt.
Shep