i will say this...about that...So the 5 1/2 primers have thicker cup and are hotter than the 1 1/2? Tomorrow i'm gonna load 5 empty cases with the 1.5 and 5 with the 5.5 fire them off and see if they sound the same.The max load for a 124gr. is 4.1 gr. on their web site.
thanks for info