I haven't been on in awhile, I ended up taking a spike bull in the Elkhorns up in Montana last year. 650 yards with the 6.5 and 140 grain AMAX. It did the job, however, I found after skinning the animal that shot placement was definitely critical. The first round hit right behind the shoulder and went through making the liver into jelly. The bull didn't go down initially, he turned and staggered towards me a few steps and I sent another, the second round hit him in the shoulder and he went down. After skinning the animal, I found that the round that struck in the dense muscle tissue in the shoulder only penetrated about 1 1/2" into the muscle tissue. Looks like it was pushing the envelope on that one, it did go down only a few steps from where I initially shot him, but that second one got my attention!
The 6.5 did well last year, took two mulies at 500+ and the spike at 650! Makes a great "base camp" rifle! The two mulies were shot right from camp up in the Ruby mountains in Nevada. (Neither of them were mine, my cousins used my dope card and my rifle to fill their tags!, mine got filled with a lever action 30/30...go figure! I pack that heavy bastard everywhere I go along with a brush gun, and I end up using the brush gun to fill my tag!)