H110 is perfectly safe when using recommended minimum loads and you don’t have to use the upper end, although the upper ends have been for me the more accurate in my 44 Mag Contender.
But crimp is another thing completely. With mag powders you need to keep the bullet in the case as long as possible to get higher pressures.
A question, how did the cases look after they were fired? Was the outside of the cases very dirty? This is an indication that the pressure was not high enough to expand the case and seal the gasses from getting between the case and the chamber walls. This is more proof of what others suggested.
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