Yep, the Hawken were a mite heavy. Course ye understand the Mountain Man didn't walk a whole bunch, he rode so the weight wasn't a real problem fer him. A've even read some o them guns had a metal shield on the bottom of the forarm which rested aginst the pommel an kept the saddle from a warin the wood in that spot.
Ah'm also thinnen that these men warn't weak. The bever traps weighed bout 10 pounds each too, course the pack horse got to carry them 'round fer the trapper.
Part o the weight comes just from the fact that the stocks were stout! They didn't want a gun whats gonna turn into splinters when it'd dropped offen thar horse down a gulley. At's also why the trigger plate often extended back under the wrist o the stock.
One of the uni-que things bout the gun was that it had a fairly thick wrist, butt and forend but at the same time it doesn't look thick and clunkey.