Hello,

Well, I tried a 8-32 die for the extractor screw and that did not work at all.  It looks like for my purposes I will be sticking with a M4-.75 on the extractor screw, and 1/4-20 threads for the action screws.  Since I am just making inletting guide screws and a extractor screw I will not go to the trouble and expense of ordering Whitworth dies at this time.  I can't justify it for what I am doing.  However if I do ever get my hands on Whitworth dies to try, or get better information on the topic, I will be sure to post my findings.  Maybe some more digging in the Krag reference materials will yield some answers.  Thanks to all who helped out.

Regards,
sixfive