I'm just assuming from the photo this 98 Mauser removable magazine is single feed. It looks much narrower. Seems like it should be doable to make a double stack fixed mag rifle with detachable floorplate accept single stack detachable mags without changing the bottom metal. Would be less capacity but possibly faster reloading. Stripper clips have their disadvantages (frailty).
The magazine I saw on ebay was definitely military and did not require specialized bottom metal. Remove the floorplate and somehow this magazine snaps in. I thought it was interesting but have zero interest in converting my Mauser or Springfield to detachable boxes.VOERE | Detachable Magazines
VOERE Kufstein bietet die Umrüstung für alle original K98 Modelle mit Standard Systemlänge auf ein Einsteckmagazin oder Klappmagazin aus Alu oder Stahl.voere.com
It is my opinion as well, a part of hunting ethics translated into hunting laws.
Besides, I dont remember I ever needing more then 2 shots for small game, either hitting or missing. If not hit by second shot, it will usually be too late for third shot.
However, legalities aside, the question remains:
Advantages or disadvantages of double stack mags and single stack mags, presumably in bolt action rifles?
I made my first safari with older steyr, 375 rotary mag. Camp gun.I like the rotary mags, holds same as a double stack with single stack feed. The Steyr Pro Hunter double stacks are good. First click the mag is in but bolt will not pick up rounds, second click is all the way home. Does not matter if 1st or 2nd click you have to push buttons on both sides of the mag to remove it, bit hard to accidentally loose a mag and they sit flush with the bottom of rifle.
Paul Mauser came up with the formular for double stacks to work properly so why not use them. Even double stacks can leave you short when on to a mob of pigs unless 10 rounder.