The German 98's (large ring) have been loaded with two types of bullets, during WW1 they were loaded the same as the machinegun ammo, with a 194gr FMJ-BT bullet. This was the standard for most of the war.
Later, when they moved to the 98K, the germans started making bullets in 154gr since it had lighter recoil. This was standard through WW2, the machineguns continued to use the 198gr FMJ-BT bullet. I think muzzle velocity in both was close to 2900FPS.
For the most part though, few people offer bullets that are ballistically close to either. Most bullets for the 8mm are flat base, soft points. There is currently a large amount of resurgence in 8mm with the great availability of surplus mausers from Big 5 and other places. Most of the big gun stores in the area carry some type of cheap surplus-ish 8mm ammo. The days of endless supplies of turkish 8mm ammo at $4 a bandolier are pretty much over. Cheaper than dirt, and a few other places still have yugoslav surplus ammo available in 900rd tins. This ammo is basically identical to the machinegun ammo. It's 194gr FMJ-BT that is punishing to shoot. There are a few other manufacturers doing new runs of 8mm mauser. From what I've seen, most of this is made by Prvi Partisan (I think they're yugoslavian). And it's available for around $6-$8/box.
If you are interested in reloading something that is "period correct" for this rifle, you may be able to find projectiles made by Prvi that are of the 198 or 154gr variety. This would be the best place to start.
Realistically, the range table on most of the mausers is a guideline at best. Even out to 300 yards I've never had to adjust my sights in a way that was close to the range table to hit what I was shooting at.
While I load 8mm occasionally, I typically reload overstock 8mm soft point bullets I get from a local gun shop who seems to get a lot of odd-lot bullets. Prvi might be a cheaper solution for plinking bullets than buying OTS bullets.