For my rifles that have wood stocks, I like to use a generic leather sling, as I feel it adds to the "classy" look of the gun.

For the synthetic rifles, I like to use a black nylon sling.

Don't care too much about ammo loops, as I put a shellholder on the back of my rifles. I do like padding on my slings, however, because it ia more comfortable after carrying the rifle through the hills and brush all day.

I carry my rifles, muzzle up, on the same side as my shooting hand, makes unslinging the rifle for a quick shot much easier.