I have one built by Ryan Breeding here in the United States. With the scope, sling, and a magazine full of cartridges, it weighs over 14 pounds. Despite the weight and the straight stock, (almost zero drop at the comb), it's a very heavy recoil....probably at or above my tolerance. More than my .577 NE or my .600 Overkill. I have not hunted with it, and probably won't.....alas, I'm getting pretty old, too. Here are a couple of photos of it:

Cheers. Chip.