I find Remington Cyclones a very accurate round with good punch in my Lakefield 64b (semi). But I also find it to be a dirty round and only use it when hunting, not for Plinking.
As others have said, Winchester Dynapoints, white bulk pack 500 rds. are a good and accurate round and can be had for under $20. They would likely work well. Every rifle is different.
By a box of 50, of every brand you can find and see what works best with your rig. What works well in one Cooey model 60, will not work the same in another model 60.