300RUM Report post Posted August 25, 2017 I am sure I am not the first to figure this one out but thought I would share and possibly make someones life easier. Sanding out a barrel channel for a larger barrel is something I always felt was a rather tedious project. I currently am switching a rifle from a 4 to 5 contour. It occurred to me before I removed the 4 it was the perfect sanding guide. The 4 has 0.650 muzzle and the 5 a 0.700 for a 0.025 increase in radius. I slid a piece of sandpaper between the stock and barrel then added sheets of paper till I had a slightly snug fit and started sanding. After a few passes I added another piece of paper until I had added a total of 5 more. Each piece of paper was 0.004 so I had increased the barrel channel by the needed 0.025 following the taper of the barrel. It was a fast process. Pull the sand paper straight up so you do not flare out the top edge of the stock. Only sand the taper of the barrel, not the chamber. The chamber area dimensions will be similar between the barrels. 4 Share this post Link to post Share on other sites
cjl2010 Report post Posted August 25, 2017 What grit? Share this post Link to post Share on other sites
300RUM Report post Posted August 25, 2017 80 grit with a finish pass of 120 worked well. That stock is an HS. Grit choice may vary with stock material. A note for anyone wondering about the sanding marks on the barrel. It had nothing to do with sanding the stock. When I re-barrel this gun I spin the new barrel in the lathe and run a coarse paper pack and forth to produce that finish. It is my Idea of a quick and easy low glare finish for stainless. 2 Share this post Link to post Share on other sites
