A lot of folks have had quite a few issues with the Hornady factory ammo. Some combination of inconsistent brass and inconsistent powder charges causing major pressure problems.
No reason to doubt that the cartridge is capable. It's got the case capacity to give good speeds the same as the Rem Mag does. But it might take careful hand loading to do it "safely" especially if you're wanting those box velocities in anything less than a full 24" tube.
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