Last time I asked, TSE (formerly MAB) charged over $500 maybe $600 for a 50cal barrel, but they used 50mm barstock. When I spoke with Tony about the cost compared to a delivered PacNor, he stated they had a cheaper option coming from 40mm barstock. Might have dropped the price about $100. I havent checked prices recently though. Tobler may also make them, likewise Sprinter ... best would be a Lothar-Walther.

Anything 50cal and above is near impossible to get out of the States. Australia's PacNor agent also cant get them.

After the CZ factory rifle, your best option to get in 'cheap' is a No1 in 500NE. Built plain and clean ... you wont lose money on it. In my opinion, use a S/H varmint rifle as your basis and you get a wider fore-end which helps you hang on. Tough thing is, they are difficult to build 'heavy' ... but there's nothing to fear from a 12lb 500NE ... I'd build it even lighter at 10lb.

If you had a donor action and a spare $4k ... I'd have Bob deVries build a 577NE ... he does a great job!
Cheers...
Con