Mr. SWJ: Re: the FN actions. They are one of the very best ever IMHO. However, something you might want to do if possible is to get your hands on the old publication by Frank DeHaas called Bolt Actions I believe. It is one of the 2 best publications on action designs I've ever seen. In the section on FN commercial actions, he goes into a bit of detail on the FNs that were opened up for the H&H cases. It seems to me that he did express a bit of concern saying something about not pushing them too hard, however I cannot remember for certain. The pre-64 actions for the H&H cases were similarly opened up actions but of course did not have the split lug for the ejector as the Mausers do. Of course there are thousands of .375s using standard 98 actions that have been opened up for the longer case with no problems whatsoever. Sounds like a great project.