OK, here is an internet response from an unknown source, but not on the 12 ga loads. I bought a couple flats of Clever Mirage 20 ga Featherlites for doves. Have a torn rotator cuff and a new Win SX3 to protect the shoulder a little. The Clevers killed doves just fine, but pressure was so low that they would not reliably cycle the new gun. The SX3 is supposed to be fine with light loads, so these must be pretty light.