I have a barrel that was made by CP Donnelly, chambered to 300 Weatherby and fitted to an FN Weatherby action. Sometime after the job was completed the owner needed to return the rifle to original configuration, so the Donnelly barrel was removed and the original barrel replaced. So I have the barrel in pristine condition and need the remainder of the rifle. I've been looking around for a Whitworth Mark X or similar rifle, chambered in 375 H&H, so that it would be a simple barrel swap. But I'm wondering if there are other actions that the barrel would fit to without extensive machining- by that I mean cutting off the shank and cutting a new shank and threads, requiring cutting a new chamber. I see a lot of large ring 98 Mauser actions available, but they are standard length and would require opening the action and new bottom metal, which is also more involved than I am trying to go. I see that Remington 700 actins are sufficiently long, but have no idea if the thread are compatible or could be made compatible. Any information on how I can get this barrel back into firing order would be greatly appreciated.