Offhand at 100 yards, with a Blue Sky re-import M1 Carbine, it's a cinch to put it all in the black on a standard 6" center target.
What kind of accuracy are you expecting/looking for?
They're not really "match" rifles. But, they're pretty much as accurate as any off-the-rack Garand. Well, close to it, anyway. The sights are cruder, it's not as adjustable...had it the same adjustable sights, you could probably pull off some incredible accuracy up to 200 yards.
It depends on the carbine (Blue Sky re-imports are pretty much shot out, big-time..I lucked out on that one), and how "new" it is, parts-wise. I have a refurbed Carbine that hasen't been touched since it was arsenal-refinished sometime after WWII. It shoots a *lot* better than that Blue Sky carbine.
Are they good enough to put 3 rounds through the same hole at 500 yards? No. Will they take down anything you're aiming at at 200 yards, from man to deer, with a killing shot? Yes. So long as they ain't wearin too much clothing