Tinker.

I did say experimental = loads based on surrogate data with a logical progression and suitable safety margin built in, having said that I do not know a gunsmith willing to risk digits on my expertise. I on the other hand " pun intended" I will.
Did I mention " I Are Engineeer " all gramatical and mispelling intended.
Since published and proof tested data is far and few between for the custom mold and RB I intend to use, I will just get it regulated for factory ammo.
I will work up my own loads looking for signs of pressure and shooting over a chrony.
Once I have a good load I may contact the gentleman you mention to truly find out what my loads are doing.

Thanks for the input and useful resource.

Nitro