the 270 works been working since 1925
Bullet construction and bullet placement are way more important than bullet diameter.
I now have rifles in both .270 Win and 7 mm RM. I've killed elk with my 7 mm RM and I've killed elk and seen elk killed with both smaller and larger caliber rifles.
I started hunting elk in the late '60s when I moved to northwestern Colorado. At that time I didn't own a centerfire rifle, so I asked the local natives that I worked with what rifle to buy. They said either a .270 Win or a .30-06. I chose a .30-06 and killed a pile of elk with it.
I had wanted a 7 mm RM for many years, but I couldn't justify buying one, because there isn't a whole lot of actual difference between it and a .30-06. I didn't finally buy a 7 mm RM until 2001, and the one that I have now is my second. Its stainless in a plastic stock and is my foul weather elk rifle and is one rifle that I've taken on 4 international hunts.
I've always liked .30 caliber rifles for elk, and my favorite elk rifle now is my .300 Weatherby.
