Effect on Combat Edit
Accuracy is compared to mob Defense. As your adjusted Acc increases your hit chance raises up to 100%. Accuracy has no effect beyond 100% hit chance. Strength also has an effect to raise chance to hit as evidenced by doing Combat Analysis on mobs with the same ACC and different STR. /wiki mob all ACC 350 350 is a good short list of mobs.
Equipment aim is added to your accuracy stat at a rate of 2 aim for 1 accuracy. Type /stats for your adjusted stats list.