I have a large selection of .308 bullets and not one .277.
I have enough rifles to load for.
Then there's that hetero thing, too.... (grin)
Actually it's action length and a barrel generally no longer than 22", often shorter. I believe a .270 benefits from a 24" barrel, and the action length added to that makes for an obliviously longer rifle and I tend to hunt thicker stuff at shorter ranges. I do have a 24" .30-06, and it's not as handy in the woods as my 20" .308. But it can be used, it amounts to personal preference.
JB has an excellent chapter on the .270 in Gun Gack #1.
