I've owned several SKS's and several AK's
Most any good sks (chinese included) with the right brand of ammo for the given gun (some like given brands of russian ammo...Barnaul seems to do really well in most commie stuff fort me YMMV Wolf does pretty average.
3 chiacom SKS= 3-4" best groups with average being more like 5-6" @100yards
1 Russian SKS 2-3" with favorite commie ammo 2" with remington SP (best one I ever had....nice Tula I think it was...pretty gun to...for a plow
AK sporters:
Norinco NHM-91 (RPK size varient of mak90) roughly 21" HBAR
averaged about 5" groups @ 100 yards I don't think I ever found anything better than 4-5" and that was about the best you could get. It had a pretty decent (for a plow) trigger and balanced nicely. No real accuracy advantage to the heavier longer bbl. other than it was nicer under recoil and you could get on target faster for it. I ran CASES through that gun and it was a lot of fun...but about as inaccurate as the average mini-14 (piss poor)
I owned a few SAR-1's They jumped around a little more but would shoot about the same as the bigger heavier gun and looked WAY cooler...I really liked my little commie plows. The last one we bought you'd be lucky to get a 6" group at 50 yrds offahdn taking your time. Benchrested at 100yards you might keep all the rounds on a piece of notebook paper...most being in a dessert plate sized cluster evenly dispersed.
I bought a WASR-10 hi-cap no-ban after all that went away and I got some AR's I wanted one with all the evul features...it made the SAR-1's look good. Total piece of junk. Now some of the milled AK's I've seen can shoot alongside the SKS's I "hear" about them shooting as well as an AR15...I've never seen on shoot as well as the Russian SKS I owned though (I've also never seen a stock mini-14 that would honestly shoot as good as it either)
Now I have everyone mad at me I guess...but that's what I've seen and I've borrowed and shot a lot of them besides the above I've owned and lived with. I really always wanted to like the mini but everytime I borrow one to shoot it's about as depressing as printing paper with a plow...sometimes worse...and then there are the lack of decent mags for under $40 a piece (factory 20 rounders being the only good highcaps I'd trust from what I've both seen AND heard from others) I've had cheap 30's that ran well enough for plinking.
To 200 yards you can easily hit a mansized target pretty regularly with a properly zeroed Ak...at 300 you should be able to quickly adjust hold over or pop rear sight to nominal 300M setting at get "on the paper" on a fullsized "bad guy" poster walking it in. But it's more like correcting artillery than shooting a rifle at that point.
the AK's with milled recievers are so heavy I wouldn't want one...the Veper is heavy as heck to. I love shooting plows for fun at cans...for anything serious I'd preffer a good AR hands down. You'll never know until you have both so you may as well just plan on getting both sooner or later
They are both a LOT of fun in their own way.
PS- on the ammo issue...some guns shoot russian steel cased BETTER than US ball or SP (most AK's will have fewer problems with their extra sloppy chambers with steelcased than with brass cased actually) Some rifles do like US made ball...the Russian SKS I owned was the only one that showed a marked improvment with remington SP hunting ammo. There are many threads out there comparing different AK rounds accuracy and even among imports many rifles showed pronounced prefferences for a given type...as bullet construction varries a lot in some cases.
I remember reading one such thread years ago that showed Barnaul and some other brand (I wanna say Norinco or SA cheetah or something like that?) would group a few inches tighter in many chinese plows...the hollow metal base bullets seemingly sealed better on the rough/oversize bores. They emplyed a similar design in machingun ammo as I recall reading t compensate for badly worn bores. I'm sure someone here must have a link to something like that.