Go to Rob Roberts Custom Gun works at [url]www.robrobertsgunworks.com or call him (He's a real talker) he is usually happy to talk with you. He has done a lot of research on forcing cones, back boring and porting. It may not be in a published form but he has the numbers.
Gerald
Last edited by Gerald Majors; 02-14-2013 at 11:50 AM..
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