Greetings:
I have an old Bench Rifle I acquired many decades ago, a real beast, a 28" long, 1" diameter barrel chambered in .240 Page, with a U.S. Model 1917 Remington Action. I have many times, given thought to re-chambering this rifle to more modern cartridge, and turning down the barrel for a sporter...however, locating a Gunsmith with that expertise here in N. CA is difficult at best. It may be possible to re-chamber it in 6mm 284 or a 6mm-06, but......that business must be left to an expert.
Hopefully, someday, I will run across a Gunsmith that can advise me if it is worth the $$$.
Regards,
Don