It's due to the length. Affinity, m2 and I've even heard stoeger. Seem likes it random. Some cycle them some dont
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Exactly doesnt have to do with which type of crimp or cleanliness, it has all to with the OVERALL LENGTH OF THE LOADED SHELL.
That’s 100% accurate and also misleading. Everything else being equal (powder, wad, shot, buffer...), the geometry of a roll crimped shell makes it longer than that of a star crimped or folded one. And, the difference is often enough to impede cycling/feeding of 3” roll crimped shells in an Affinity and its Italian cousins.