I restocked my .223 ranch rifle with a good kevlar stock, have a good scope on it. It shoots much better, not match grade but 1.5-2 in @ 100yd. and the first shot is usually right on. I guess the thin barrell heats up. That is usually all the shots I get at coyotes,
also I did the same for my SKS, Kevlar $40 stock. It also shrunk the groups by 1/2, now around 2in. and again the first shot is right on. I have no complaints with either gun, they are what they are. I bought both years ago and have about $300 in it for both. excluding stocks and scopes.
And the better ammo you use the accuraccy gets better. I still shoot cheap russian most of the time except when I deer hunt with SKS. You do not want to use those russian 123 hollow points on deer, but the Winchester .762x39 performs well