I've put on 50 lbs of muscle , 1/3 my body weight since starting this process, and maintained visible abs and decent BF% the whole time. went from 147 lbs to 200 lbs. height of 5'9.5".
at my height , competing in IFBB pro classic physique, the most i could ever weigh on stage is 198 lbs (i'm there weight wise) <-- thats just for reference , I'd never want to compete in bodybuilding and don't have the physique to do so . so I guess that means I could bulk up to a good 225 lbs and cut to a 198 stage weight.
still think it would be cool to bulk up an even 100 lbs from my starting weight 5+ years ago when I went from being a skinny cardio athlete (cyclist and runner) into bodybuilding. that puts me at 247 lbs . problem is i need to bulk slow slow slow , my BP and heart rate just can't handle a lot more weight and fast bulks, i gotta go slow and steady at this point and let my body adapt.
but still think that putting on a solid 100 pounds of pure muscle as a middle aged man would be pretty sweet (i'm 39). only got 50 more pounds to go