I only own one two centerfire rifles with detachable mags. An AR-15 and a Rem. 760. I really dislike detachable mags in bolt action rifles. I simply won't buy such a rifle. It seems to me that gun companies are going with detachable mags to save $$. I've never had a situation in over 50 years of hunting where I needed more shots than the four or five rounds that my rifles held.

As for carrying extra founds, when hunting deer with my 760 I just put an extra loaded mag in my coat pocket. When using my bolt action rifles I carry extra rounds in a cartridge holder on my belt and keep one extra round in each of the two front pockets on my coat. I guess I should ad that I've shot everything from Rabbits to Elephants with my bolt guns and never ran the gun dry.