The intrinsic accuracy of my Nylon 66 was good. From a bench rest it would shoot groups comparable to the best my friends' Marlin Model 60 and Winchester Model 77 .22 autoloaders could do. However, due to its ultra-light weight and (compared to wood) flexible stock, its practical accuracy in the field was probably not as good. However, it was more reliable than other autoloaders and it would feed reliably in any strange orientation, including upside down.
Using the sling as a shooting aid, for example, would move the point of bullet impact a couple of inches to the side at 25 yards due to lateral stock flex. The springy Zytel stock made the Nylon 66 shoot away from any hard surface against which it might be rested against in the field (rocks and stumps, for example). This is true to some extent of all rifles, of course, but the effect was exaggerated by the nylon stock. And the rifle was so light that it was very hard to hold steady from unsupported positions.