I am a big guy, and I don't generally fit into or like the confines of the average mummy bag. I have a few sleeping style/bag suggestions –
– Quilt – You will save a lot of pack weight and can customize to fit your body and sleep preferences. Might be worth a shot.
Off the Shelf
– Kelty Coromell 25 (down) – this is a generous down sleeping bag (72 inch girth) although it isn't the lightest thing out there. It packs down to a reasonable size, and with the 50% off coupon for Dept of Goods was as low as $85.00.
– Mountain Hardware Extralamina – Again not the most compact thing out there but it does pack up pretty small comparably. It has a generous cut (hence the "extra" in the title)and uses a synthetic insulation.
– Cabela's Boundary Waters bag – These get high ratings and have been rated by Backpacker as a good choice for bigger campers. They have two temp models available. The price is somewhat high (IMO).
– Northface Hotlum XL. Like the Extralamina this also has a shoulder girth of 68". It is a 15 degree down bag, and you can generally find them for under $200.
It seems to me that for the larger crowd, the sleeping bags seem to hover right around 3lbs for the off the shelf models. The previous list I have provided is by no means exhaustive, so please add additional feedback and comments. I know this is BPL, but I find that I can't seem to break 3lbs for a sleeping bag that accomodates broad shoulders at a reasonable price. Just my opionion…Feel free to heap on scorn. :)