https://www.gunpartscorp.com/search#query=Heym%20barrel&showed=100&sort=Price:asc

If anyone is interested, Numrich has a bunch of Heym rifle barrels for sale. Many are contoure for double rifles and also some blanks for bolt guns. There are some contoured 375 H&H barrels and 500 Nitro. I bought a few smaller caliber that I can use for other rifles and the bores on these barrels look pretty impressive through the borescoped. Oh, and there are some new drilling barrels and a complete 30-06 SxS barrel set in the white. Interesting stuff.