OMG, 41 pounds?? That's so frekaing heavy...i thought barret's were heavy bastards....
Anyway, yea the .50bmg is cheaper ammunition wise....but the .338 lapua guns themselves are cheaper. you can get a sako trg S for like under a thousand....great deal for a .338 lapua capable gun. But ammunition for the .338 lapua is few and far between.....Shoots accurate as hell though, as with the .50bmg, i have yet to find a place that can truly try out the capabilities of either caliber. Seriously though? go for a Serbu BFG-50, cheapest accurate bolt .50bmg out there, it runds around 2,000 with bipod and muzzle brake (u need the brake, God knows how one of these things would feel without it, i'd probably lose an arm and a shoulder....). Quite economical, and simply cool and clean. IMO barret is overpriced, unless u plan on getting the M82A1 it's not worth it since all bolts pretty much work the same. And if your not strapped for cash at all?? Get yourself a MA- Deuce....i've seen semi auto versions that are only 7,000 or so...and the neat thing? Theyre KALIBAN LEGAL...muhahahah