Pointy bullets pointing off center due to rim, points resting on rim. I would not be too concerned about recoil firing a round. Now if the rifle was dropped on its muzzle or butt you might get the rounds to go off. For that reason, I would be surprised to see a manufacture produce a tube magazine gun in this caliber.
I know if you brought a tube magazine rifle to me to relined and rechamber for these cartridges, I would decline.