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I found my Dremel and went to work on the P3AT and P11/357.
Chambers, feed ramps and the rib under the firing pins on both pistols were polished bright as decorative chrome plate. In addition, breech faces were also polished to reduce friction as cases are forced up the breech face.
It was disconcerting to note the very steep feed ramp angle when the barrel is tilted down on the .357. Despite very low friction of ramp and bolt face, both Winchester FMJ flat point and Speer Gold Dots would hang up and not manually feed without a good bump on the back of the slide. Perhaps round nosed Power balls with their lesser ramp contact angles would work better.
Looking at the problem objectively, the bullets' nose is up against a steep ramp while the cartridge is more or less restrained horizontally by the force of the mag spring and the length of the magazine lips. In order for it to run up the ramp, the cartridge must rotate in the vertical plane, camming down & depressing the magazine spring to be able to clear the magazine feed lips..
While it's not possible to make the feed ramp shallower,
It would seem that work has to be done on magazines involving
followers and lighter springs.
Altering the slide and/or magazine feed lips to permit cartridges to sit higher would also help.

In spite of what appears to be a serious design defect, the pistol functions well under the significant concussion of firing with less than full magazines.
 

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Just open the feed lips a tiny bit in front with a wooden dowel or other tool... the top round will then point upwards toward the feed ramp more accurately.
Flyer
 
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