I would lean more towards the machine gun role. RPK-PKM type weapons. Although it shoots well in my PSL there are specific marksman loads in that caliber. Just my 2 cents
Do you know the what country the ammo is from? Ive got silver tip from both Bulgaria and the Czech Republic. Im no self proclaimed expert but i dont beleive silver tip means anything special other than at that time in production thats how that country identified there ammo. The Russians have 762X54 ammo that all looks the same. The packaging is the only way to tell the differance.
Ive seen heavier grained ammo with a yellow tip i beleive from Hungaria. Plus most Commie ammo has steel in it.