British .303 was a deer-slayer in my youth,,,
I might have been the only person in the state of Oklahoma,,,
To not have taken a deer with a British .303,,,
I used a 8mm German Mauser instead.
Seriously though, in the mid 1960's,,,
A kid could get a .303 for the grand total of $19.95,,,
Granted, that was a whole lot of lawn mowing but worth it.
Both of my brothers, my dad, my brother-in-law, and a slew of friends,,,
All took large deer with the 150 or 180 grain soft-nose round,,,
I would have no problem going after elk with 180.
Happy hunting
.