I had a mold for 44 & the gc shank was a bit small , after installing a copper check you could spin it , the aluminum check has crinkles on it`s edges & when installed they seemed titer & recovered boolits from the berm had all the aluminum 1s still on .
What affects fit s shank size & aluminum thickness used to make the checks, so in my case if needed I could have used thicker for a titer grip if needed, thus eliminating some custom mold work.
As far as fouling , I`ve looked & after shooting 429215 at higher fps to 310 gr at not so fast fps I saw very little with a bore scope a lot less metal transfer than using jacketed .
My Redhawk has been set up for lead , 11 degree forcing cone ,All throats exactly .4315", fire lapped to relieve a small thread choke & then polished with jb bore paste.
I used to be able to shoot better than the Redhawk , but these days the Redhawk is kiking my butt!!!!
GP