I started lifting about a year and a half ago. Bench press was 160 at 46 years old. I set a goal to hit 500 by age 50. Lol, unrealistic right. I thought so too but I am up to 415 on bench now. Have 2 years to go. That's why I am becoming more interested in compounds like SD, Halo, ect. I could bulk up to 300 lbs and achieve that goal but that's a lot of weight to carry around muscle or not. I'm at 245 now and trying to stay around that weight.
Halo would be something you’d add last 2, maybe 3 weeks out from a meet/attempt day. Think about it like temporary neurological supercharging. It will add zero weight gain.
Superdrol is for sure going to add lean tissue, probably a couple real lbs of new muscle tissue even besides the glycogen weight, and the better option for building the foundation up.
I’m down to 245 at 5’10” currently as well and can’t imagine 300 on my frame; I was pretty damn fat when I pushed up to 265 a couple years ago & it was very uncomfortable - 253 a couple months back was harsh. I suspect ~285-290 would be my absolute temporary limit. Going to make a push into the 260s again later this year, but I’m 31.
Being 48 and 275+ on steroids is a recipe for a cardiac event, so I agree keep the weight as low as sensible to purse your goals.