I'm curious. What advantage does a removable magazine offer? For the most part 5 rounds is 5 rounds whether in an internal magazine or a detachable magazine. I would think if you couldn't hit the animal after 5 rounds give it up.
I have seen more detachable magazines that malfunctioned than internal magazines. Perhaps it is because the internal magazines never get sat on or dropped in the mud, etc.
I have yet to see an internal magazine get lost, be left in the truck or back at the camp or home or be the wrong magazine for the rifle.