keep it a 32-20.....
I was in the same boat as you a few years ago...The rifle had a sewer-pipe bore, but was a deluxe pistol grip w/ set trigger, 1/2 oct. barrel, etc....Had it relined back to 32-20, and used the Hornady XTP 85 gr. JHP for woodchucks...Very accurate, a humane killer, and the rifle still has it's factory barrel address...A biggie, should you ever want to sell it.....
Just my .02 cents...
1911