scouter,
I had this same problem in about 1980, and had my gunsmith build a 6.5-'06 for hunting and a .280 Rem (actually a 7mm Express) for metallic silhouette. Now having the actions at Gene S's would suggest some cartridges over others.
I don't know what your biases are, but I would build a .30-'06 and a .370 Sako.
The '06 will do everything in North America, and the .370 Sako was designed to be the largest case capacity you can get from the '06 case without serious case forming drama...jim
