Unless I draw a branch bull tag I usually pack my SS FW M70 '06.Boring but true.

I used to use a .308, Then I went to an '06. I had a little trouble getting one great big cow to fall over-three 180 gr NPT and she never took a step but it made me nervous.

I decided I wanted to try a .338. My new wife bought it foor me about 26 years ago. It works really well. Even so, after killing a couple of bulls with it all it seems to do better is make them flinch a little when you hit them. They still go a little ways before they tip over. I have a bunch of other rifles (more '06's, 7x61 S&H Super, .308, .35 Whelen, .308 Norma Mag, .300 Weatherby, .375 H&H and others) but then I am a looney.