chamber reamer

For awhile now I have been trying to mathematically figure out a way to determine optimal freebore for a given cartridge and bullet. Obviously the easy way is to send a dummy round to your smith or the reamer maker and be done. I however would like to figure out a way to accurately determine...

I need help figuring out how to calculate Freebore (FB) for a 6.5 WSM custom chamber reamer for a new rifle build I want to do. Over the last few years I have had a number of custom chamber reamers made for various builds. In each case I either had a SAAMI reference chamber and drawing I could...