Don, some more thoughts
Have these pistols been "worked-on"? If the 147 grain bullets always work and the lighter bullets work sometimes, the difficulty could be in the main spring or sliding fit (lube). If you are convinced the pistol has adequate lubricant (and that means not too much, as well as too little) and if someone has "messed" with the pistol, then you might consider a main spring change to a lighter one. This is not an easy task if you have never done it, so make sure it's something you really want to do. Wolff Springs makes a set of these springs. Other forum members have much more experience with this operation than I do, so hopefully they will step up.
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