Great and interesting thread,
Something I would definatly consider trying, but as Zak said, (or at least how I interpreted it) If I found that I could shoot a "non-traditional" customized .260 rem better than the trusty .270, why wouldnt I bring it on a hunt...
My Glock 34 for example was made to meet the exact requirements for IDPA, that doesnt mean it wouldnt make a great duty gun and I even know people who conceal it daily...
There would just have to be different classes in my opinion, I know people who only hunt with a 30-30 or sks, they probably wouldnt do so well past 200yrds but as long as theyre advancing their skill whats the issue? I know I wouldnt win but Id still play.