Use a cleaning rod with a ball bearing handle. Put a cleaning patch on it. Push the rod all the way in. put a mark on the rod up by the handle and another down by the bore. Pull the rod out, wait until the mark up by the handle makes one full rotation and put another mark by the bore. Pull the rod all the way out and measure between the two marks. Your rate is 1 and how ever many inches between the two marks.
Jesse
Bookmarks