I use RST in my 28's almost exclusively, unless I shoot my own reloads. A couple hundred FPS in muzzle velocity isn't going to make much difference on those slow-flying birds you name, with the exception of the doves of course... and then just give the doves a bit more lead - what the heck, they're not dodging trees and apple scrubble.

RST makes wonderful loads in all but .410 shells. Morris is a wonderful guy and how could a guy like that produce anything but the best?