My first steroid was Superdrol and at 170-172lbs I benched 350lbs for reps. It's not unbelievable at all. I'm not a strong fucker but I was just consistent and determined.
I've seen lots of kids at my gym, definitely natural, bench three plates as well. All under 180-190lbs. I don't know why anyone would think that's impossible or even hard.
I can't explain it. This was in 2008, when I was 23 and had just returned to the gym after an 8 month break. Within 2 months of training, by no means with any supplements other than a scoop of creatine for a few weeks (which I then threw away), my bench went from doing 25s on each side flat bench to 225 for 10 reps, and then 315 for 3, with pause. I was strong as fuck in my own eyes at the time. And now, 6 years later, I eat just as much and have been training consistently for 3 months, and can't do 225 for more than 2 reps. I'm baffled, because my body weight is like 30lbs more than it was back then. I still get sick pumps and my chest gets so tight I can't cross my arms in front of me or take off my shirt, but...yeah, I hate being weak.
My theory is that when you're "on" something, you can lift 50-80lbs more just because you mentally think you're juiced. Even if you're not. So real steroids must be insane for strength gains.