My Chinese SKS shoots quite well, as well as I could hope with open sights and old eyes. The trigger is a bit gritty, but it is controllable. The rifle does not have any great desire for a particular ammo. I have only shot the standard bullet weights, and have not tried the 154 grainers.
The rifle is a typical Russian military design. Simonov copied and scaled down a 14.5mm. anti-tank weapon, so it is very overbuilt. Though it does not have the niceties we expect of sporting weapons, it is a rifle that will fire clean or dirty, using whatever ammo is available, whether dirty, corroded, or badly made. These are matters of military necessity. Canada used the Ross in WWI, and the soldiers got rid of it as soon as they could, even stealing SMLE's from English troops. Rosses were great for accuracy, had a fit and finish that would make any gunmaker proud, but it took very little to tie them up, and the loose old Smelly was one of the best battle rifles ever made.
If you look at the SKS and worry about its lack of looks and finish, remember Townsend Whelen's advice: the only interesting rifle is an accurate rifle.