This is meant as comparison and not so much as arguement. It's subjective based on personal experience.
Before you shoot it, you may need a shoulder pad because the 8 mm in a mauser kicks like a mule... Don't know how those German soldiers do it during WWII in a prone position with the stock recoiling against their fragile collar bones... No wonder we won because M1 garand kicks a$$.
I wouldn't shoot a K98k from prone. But then, mostly my shooting is standing offhand or across the bench. IMO, it'd be best to shoot this one from standing because you can absorb a lot more recoil from standing.
Ammo: surplus 8mm is corrosive, and you need to either rinse the barrel with warm water and blow-dry it, and then clean with CLP as usual. Some use diluted Windex instead of water. Either way works fine.
I mixed up a bottle half-and-half, water and ammonia. I just swab out the chamber, bore, and inside the bolt, and wipe off the bolt face and firing pin, then clean as normal with Hoppe's #9. I haven't had any problem with it rusting.
Modern 8 mm soft-points (hunting variety) is not corrosive... if you are concerned, always have the headspace checked by a gunsmith.
Not only are modern 8mm (8x57JS, 7.92x57) hunting loads non-corrosive, they also don't kick as hard. They're not loaded to has high of a pressure as milsurp ball.
K98k sights are kinda weird, and I didn't know how best to use it.
Those sights are geared towards being Minute-Of-Enemy to 400m. Here it is, best of my knowledge:
100m- aim for the belt buckle, hit COM
200m- aim for the belt buckle, hit COM
300m- aim for COM, hit COM
400m- aim for the head, hit COM
That was with 198gr German ball. I've shot some S&B 196gr SPCE (non-corrosive, but costs a mite more) and POI was a lot closer to POA.
You can buy surplus ammo from aims, CTD, etc... a lot of online sites.
I've bought Turkish headstamped 1935 from CTC. It's 196gr steel jacketed running about 3100fps. That stuff kicks like a mule. I've also bought Romanian from AIM and that's 153gr FMJ running IIRC about 2700fps and it don't kick so hard.