800lbs is only what Wolverine is listed at by Marvel but his strength feats put him above 100lbs and in a berserker rage he is in the 1 ton range. All we have for Drago is someone "thinks" he might have lifted 800lbs.
Boxing gloves are wieghed in before and after the matches are they not? Is that not to make sure the boxers don't cheat and line their gloves with something? People used to put tinny barring in their gloves to give them an edge and if that makes a difference then I have to imagine that adamantium bones would make a hell of a difference.