About 6 years ago, Mlex (or M&F) did a photoshoot/article on Melvin, Cutler, Dillett, and somebody else doing a bi workout. I believe all the guys curled 145, then the photographer asked them to do 225 and they all said no. Finally Cutler did 2 for negatives only...
So it seems unlikely that Ronnie could even do this - much less with perfect form...