I patterned my gun (VersaMax w/Pro Bore .665 choke) with several different shells, and the Magnum Blend won out over all others. I only had one Winchester High Density and it did very well also, but they are like $40 for 10 shells - if I could find them in a box of 5 I would buy them to.
One question - I see the magnum blend comes in 3" (which I shot), and in the 3.5 inch - has anyone tried both to see which patterns best? I haven't seen any 3.5 inch around here - would pattern them if I could find them.
Also, insofar as kick is concerned, I find them a very soft shooting shell compared to some of the others.