It's going to be almost as heavy as the standard 7½" Super Blackhawk. I had one and it was 1oz heavier than a 4 5/8" Super.
JackMoser65 you are correct. I have looked at the specs on the flat top 357 before and IIRC they are listed at around 44oz. Thats not very far off from the Super BH I have in 44 mag with a 5.5" barrel. Plus I already own 6 357 mag revolvers now. I really don't need another one. My buddy has a 357 Vaquero and it is one chunky little pistola.
Its why I really like the 32 mag single six. It weighs around 32oz and is a pleasure to carry on a belt. And I have so much 32 loading componants that it cost almost nothing to shoot.
One other big bore ruger that does interest me is the Black Hawk 45 Colt/45ACP convertible. With the 4.5" barrel and alloy grip frame it shows to weigh just 38oz. Thats a packable gun with some thump. But it would cause me to have to get dies, at least 2 bullet moulds, brass and a slew of jacketed bullets. It would be an expensive start up.