Doc-personally I feel that the 260 is one incredibly capable round and would have absolutely no issues using it on elk to 400 and under the right conditions quite a bit further than that.
Someone mentioned having an 06 around. To this it's my personaly opinion that in order for the 06 to penetrate more than the 260 would with a good 140 the 06 would have to use the 200. I feel that the 140 out of the 260 will penetrate just as far as a 180 out of an 06.
Comments to the sort of it'd be ok to 300 and under and such really crack me up...
Dober
Dober