"...there are only 6 listed powders..." Means they only tested 6. Not that there are only 6.
There's lots of data for an 80 grain Hornady GMX bullet on Hodgdon's site. A GMX is a solid copper bullet too.
"...load data for that bullet..." You do not need load data for that bullet. You need data for a solid copper bullet. Who made it doesn't matter.
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