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Depends on the mags, since the inner ribs for the 223 rounds to keep then straight coming up, will cause canting problems as the 458 round is coming up in the mag body instead...
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Not true. The .458 SOCOM was designed to work with standard unmodified GI mags from the get go. It pretty much center feeds the .458 SOCOM. Even with standard followers, the mag may hand stack slightly one side to the other but during actual life fire, they always feed from the center. And I have never had a problem dropping the bolt on a round with it to one side or the other in the magazine and had a fail to feed. I have a dozen .458 SOCOMS from 6.750 to 28 inches and have used just about every type of quality magazine out there, and the only mag that has ever given me trouble are P-Mags with spitzer bullets because of that front rib. I've never had to modify feed lips or even cut the half moon in the front, although I do cut the half moon to make unloading unfired rounds easier. I have never encountered a need for them to be there for feeding.
You don't need to do anything to decent 5.56 mags to make them feed in a
properly built upper, which Radical are well known
NOT to be. From the looks of those pictures, the jam is being caused by what Tony said, the unmodified ejector. You must have that bevel he showed in his picture so the case head can enter the bolt face.
I tried one non TROMIX .458 SOCOM bolt, a complete BCG sold as Tool Craft from Joe Bobs, and it could not be made to feed the .458 SOCOM round no matter what. Three problems, ejector not beveled, extractor not modified correctly, and bolt face too small. Good thing I bought it on sale and only need the BC and guts, not the bolt, because the bolt was a POS. After replacing the extractor with a TROMIX, modifying the ejector, and getting Paladin to open up the bolt face to spec, it works now, but the bolt Joe Bob used in their .458 SOCOM Tool Craft BCG is complete garbage.