I'm a fan of the Lee Enfield action. It's very simple, and very fast to operate. Your hand has momentum as it's stripping off the next round, and you can close the bolt against the cocking spring quite easily, and quickly. More so, than with the lifting action of cock on open designs. This, combined with the locking lugs being on the rear (giving it a shorter stroke than other actions) is what gives you the speed the Lee Enfield is famous for. Along with the speed of the Lee Enfield action, comes it's 10 round magazine, making it the perfect bolt action battle rifle. Everything else about it, size, weight, cartridge... is pretty comparable to all its contemporaries.
Starting out with 10 rounds is a big advantage, and it doesn't really take longer to reload if you just load 5 like you would in all the others, but if you do, you're back to having twice as many again... Also, you could just throw a single in, and shoot it if need be. That's something a controlled round feed Mauser can't do.
I only have one Lee Enfield, A No 4 Mk 1* that was made in Canada at the Longbranch facility during WWII. It was pretty rough when I got it, and has screw holes in it from a scope mount so I decided to modify it to my own tastes rather than restore it. It's a "tanker" or "scout" rifle now, but I wouldn't hesitate taking it to combat if I had to use a bolt gun. The shortened 16.5" barrel makes it a lot more handy, and the red dot makes me a lot faster on target.
On the plus side, I have a unique rifle nobody else has.