It's really dependent on the specific pointed pellet being talked about- some pointed pellets will fit and allow the magazine to rotate- most will not because of their length.
It's just easier for ads to say "no pointed pellets" than try to get into more detail.
As for which pointed pellets will work- can't help you very much there. I use mainly wadcutters and Crosman 'hunting' pellets which are pointed- but not sharply and are nowhere near as long as something specialized like a Predator pellet or the like.
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