jupiter,
I can not speak about much of the ammunition that Ruger suggest not using, but I can speak of my experience with Winchester xPert.
I have found that ammunition to be very annoying. I bought a bulk box of it to shoot out of my SP101 in 22LR. I found that the bullets were very soft and leaded the barrel, forcing cone, and front of the cylinder a great deal. After shooting 200-300 rounds down my little revolver, it almost looked like a smooth bore, and there was so much lead on the front of the cylinder that it was very hard to cycle the action.
I have not had that same issue with any of the other ammunition I have shot.
I doubt I will ever by anymore winchester xPert
Charlie