The impression I get is that the most popular deer cartridges in the east Kootenays, are:
1. The 270
2. 30/06
3. 308
4. 243
5. everything else.
50 years ago, the 303 would have been at the top of the list.
I have killed more deer with my no.4 MK1 than with evry other rifle I've owned, combined. These deer were taken with the 303 or, in the last 20 years, with the 30/40 Krag (I re-barreled it). By the way,it has also shown itself effective on elk, moose and black bears.
When I was 14 years old, my dad bought this rifle for me. I kind of wanted a 94 Winchester but he felt the added power of the 303 would make it more suitable. I'm glad he did. GD