As someone suggested earlier, use a caliper to check the outside diameter of the PROBLEM ammo against the size of bullets that will load.
Since it is only the Winchester ammo giving you a problem, my guess is that your cylinder is within specs but the problem ammo is not.
My next question is, why did you buy a 2nd Ruger after having problems with the first?
Personally, I own 2 Ruger pistols right now and have owned/shot many other over the last 40 years. Never had any problems with them.
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