All things being equal lever actions are heavier than bolt rifles. When you have that much steel in the action and hang a steel magazine tube under the barrel it adds up. My lightest lever action, a Winchester 94 @ 6.5 lbs is exactly the same weight as my heaviest bolt rifle. Almost all of my bolt guns are lighter with scopes on them than the lever actions are without optics. Most Marlins, Henry's and other lever actions are 7.25-9 lbs. Add any optics and you are 8.5-10 lbs.
So true, big caliber lever guns weigh a lot. I have handled M1886's in 45/70 and M1895's in 30-05 and they are heavy. Can't imagine scoping the things, they would be even heavier.