Like Jack, I've never heard of a military .270. With .30-06 your choices are a little better. There's the aforementioned Springfield 1903-A3, the earlier Springfield 1903, the Enfield P17 (I'd really like to get one of these), and the M1 Garand. I'm sure there are some others but those are the ones that spring to mind. The 7.5mm Japanese Arisaka can be easily reamed out to .30-06 as well.