Technically you are right. It is the powder. H110 needs to have a lot of pressure build inside the case to perform as. intended.
Your combo cannot provide this because you are using soft, slippery bullets with no cannulure or lube ring to crimp on.
It boggles me why someone would buy a $1500 revolver and try to use the cheapest components they can find.
Get a Smith RHKP in 38S&WSpecial if you want to plink on the cheap.
A 500mag shooting a plated bullet with no gas check and a full house H110 load, brings to mind a flying, molten, orb, blob flying at super sonic speeds
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