Grizz:
We use to belong to a range that had metal targets set out at 100. 200, 350, 500, 600, & 800 yds. We never shot at paper at that range. My son-in-law and I have a few (him many) military rifles from all era's including Mosin Nagants. Some with optics and some without. The 200 yd metals were no problem with any of them. About 400 yds was a breaking point where the scoped guns had little problems and the metal sight guns started to have serious misses. But My son-in-law had a couple of Mausers that he was able to use at 600 yds on a deer sized metal target. He of course had to walk in the shots but he could hit it. My Mosin Nagant even with clone optics was not one of the first runners but 2 to 3 hundred yds was not an impossible challenge for it, even with metal sights.
Mosin Nagants are not my favorite military gun as they are a bit too crude for me (but I have one), I like the WWII and post-WWII semi-autos much better. I like M1 Garand's, FN-FAL's, H&K's (actually new PTR91 clone). Our choices in California are very limited but I have all the ones I ever wanted.
LDBennett