Your biggest issue will be finding ammunition for the K31 in the future. The 7.5x55 was mostly chambered in military rifles, but there were a few sporters made up.
Not enough to encourage any large commercial manufacturers to chamber rifles for the cartridge. Some European manufacturers will build them on special order, as will smiths here, but I've only seen two sporting rifles chambered for the cartridge, since it came to Canada.
The surplus GP11 is still available, but not every gun shop or big box store carries it. Norma makes hunting ammunition, but it's hard to find.
Your best option would be picking up several hundred cases and reloading. If you don't reload????????????