Which one?
First Lyman Plains (not great plains) in .58 1-48 /.62 smooth both 15/16", early 1970s. The rifle does good with PRB or hornady GP conicals. The .62 is a straight bore, good with shot to ~ 30 yds, and decent with a ball at 50.
Next a Renegade stock, davis trigger and GM 1-28 barrel in .54 (90gr FFG wonder wad 425 GP hornady).
Then a Thompson hawken stock, NOS OEM Thompson 1-66 barrel, Davis trigger (shoots nice PRB, 0.018 patch wonder wad 110 FFg 0.530 swaged).
Another renegade in .50 1-28 GM stainless (80gr FFg wonder wad 385 gr buffalo bullet).
Another TC hawken .50 , davis trigger, 1-48 TC barrel (PRB or buffalo bullet) and 1-28 GM stainless barrel (buffalo bullet).
A Charles Daly fitted with a NOS Toledo 12ga extra full choke chromed, TC drop in barrel. It is light and sweet, only 15/16" on the flats but came with a proof sheet for 12ga barrel, ain't blown up yet. Good turkey/duck medicine.
The GM stainless barrels were a GM sale long ago, $100 each. Shoot conicals great, or PRB reduced loads. The NOS OEM .54 1-66 TC barrel came from member here, THANKS! All the thompsons were orphan stocks I rebarreled