Im looking at building another lightweight truck gun and want a very short barrel, I have a long action 270 win to build off of. I was wondering what you guys would recommend for a rifle for deer and elk with either a 20" or an 18" barrel, I have a 30 cal barrel laying around and plan on using it. So i was thinking either 30/06 or 308? If it was your build and had those choices which way would you go?