To be honest, if you have a .224 and .277 you don't need a 6, 6.5, or 7mm unless it is for a specialized purpose. I have rifles in .223, 22 Hornet, .243Win, .270Win, .45-70, .375H&H and a 7mm-08 for the wife. I bought/built them all for a purpose. The .375H&H was more to get a Ruger No.1 in the...