Glen,

You anneal, engrave and reheat treat. You can have had gold, such as gold wire and inlays and the hear treat process doesn't bother it.

2 other possibilities: 500 X 460 Weatherby (i.e., 510 Wells Express), or 510 Nitro (just the 50-140 Sharps loaded to high pressure). The Weatherby variation would probably require minimum action mods since it has the smallest rim. Next would be the 50-140 Sharps as it is slightly smaller than the Nitro. I owned a 460 No. 1 for a while and I don't think safety is an issue, but if it bothers you go with the Sharps as it has the smallest base diameter.