190 X 50% = 95 lbs
95 + 190 = 285
not sure where 350 lbs came from as that would be closer to 84%
Actually, in reality we shouldn't even be counting the first 100lbs of skeleton, organs, skin, and fat.
What we really have in a 195lb person is maybe 95lbs of muscle.
so if they were to increase their musle size by 50% it would only be about 50lbs.
Putting the individual only at 245lbs.
To answer your question this is what you must do.
Find the weight of the top drug free heavyweight pro's around 235 I imagine.
Find the weight of the top Heavyweight Pros using drugs, around 300 I imagine.
230-100 for organs, skeleton, fat, etc. = 130lbs
65lbs, the difference between pros and drug free happens to be 50% of 130
It seems, at least with this not so scientific equation, that BayGBM may be right with his 40-50% guess.