Savage 99 C or CD with detachable magazine will accept 4 .308 cartridges in the magazine. I bought a spare magazine for mine (to have just in case I lose one on a hunting trip). You can load the rifle (and magazine) without removing the magazine. Most people that decry the detachable magazine do so from a sense of traditionalism, not function; I have never had a failure due to a magazine malfunction.
If you can't kill a deer/antelope/elk with 4 rounds of .308, is one extra round likely to make a difference?