I’ve shot an r93 in 300 win mag a few times - it’s uncomfortable and not nice. I have shot properly weighted wooden stock 375 and 416 rigby - a healthy shove, but not uncomfortable.
A mauser action is tough, reliable and control round feed. In the bush a bit of dust is not going to stop it. An r93 or r8 has far too many little components that dust /dirt will stop then quickly.
A double is simple. Two shots quickly, and a quick easy reload another two. Yes a magazine has three or four rounds but in a stopping rifle its the first two shots that count. And you need to be able to reload without looking at the rifle. With a magazine that takes a lot of practice.