Pointman,
Interesting that a 6.5 was brought up. I have often wondered why the military hasn't drawn up a contract for tender to develope a 6.5 to standardize all their guns on. NATO compatability aside, it would be, in my opinion, about the best overall cartidge and ideal for sniper use. Something like an enlarged 6mm PPC in proportion - overall length about the same as the 7.62.