Rimfire barrel for BR shooting

[TRSR8]

No i haven't. Obviously you have never been in an aerospace/defense or other high tech shop. And everybody understands such application would not be affordable today. Forty years ago I worked in the production of silicon wafers where the tolerances were only a few microns, now this is a world wide commodity. Technology advances provide affordability.

You’ll be the first guy I call when I start that surface to air RFBR build with the NVDA guidance system.

 

[PWNolan]

If they maintain contact and the bullet seals it doesn't matter. Taper lapping by itself is not magic or always necessary. It's just the easiest way to ensure consistent contact and bullet seal.

Understood

 

[Dannybcc]

I have a Penrod Muller 4 groove and an Stiller Muller 8 groove. They both shoot very well. To many variables involved to tell you which one shoots better. My honest and humble opinion, take your pick.