Measured groups:

3 Qty @ 58.0 = 2,956 fps - 1.680"
3 Qty @ 58.5 = 2,973 fps - 1.200"
2 Qty @ 59.0 = 3,037 fps - N/A
3 Qty @ 59.5 = 3,051 fps - 1.670"
3 Qty @ 60.0 = 3,093 fps - 1.930"

“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery