I can't answer those specific questions but I can add one bit about a .260 build. Use a long action - not a short action if you intend to handload. Here's why:
I've got a .260 in a regular short action (Rem Model 7). My hunting buddy has a .260(AI) built on a long mauser action. One of the fantastic things about the .260 is that you can use some very long bullets with a really serious BC. Because his is built on a long action, he can use the 160grn bullets AND seat them far out. With my short action, I can't even think about using a long bullet like that - much less seating anything far out. They will neither fit into the magazine nor will they fit into the bolt opening.
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