Yes the .300 mag and short mag and the 7mm rem are bigger then a .270.
Is the law just no hunting with those calibers bigger then .270?
where I live you cant hunt with anything bigger then a .270 but can shoot them for target practice or sighting in.
My go to rifle for hunting deer is a 7mm rem mag, I've shot deer, bear, moose and antelope all with a 160 grain accubonds, worked flaw less on all, Still use it for everything but moose.
I would have to look at the specs but 160 grain out of a 30-06 maybe a tad slower but would get the job done for all critters you wanna shoot, and I wouldnt be scared to shoot a deer with 180 grains, maybe not a fawn but that's me, stick with good bullets, I'm bias to nosler cause had some Hornady's not do what I thought they should, nosler partitions and accubonds and watch the freezer get full
But you could by a .300 mag or short mag and have the same range off bullets as the 30-06, the short mag has less recoil from my experience and that is the reason I bought one over the .300 mag.