On this year's Elk hunt, my hunting party ended up carrying some unlikely weapons for much of the hunt. And by "unlikely", I mean: Even more unexpected (and "taboo") than the primary weapons.
Primary weapons:
.270 Winchester (2 hunters)
.358 Winchester (1 hunter)
7.62x54R (2 hunters)
What was actually carried for most of the hunt:
.223 Remington
.30-30 WCF
.44 Mag (handgun)
.357 Mag (handgun)
.22 Hornet 
Yes, they are all perfectly legal where we were hunting.
