A loose spot could be as little as 0.002” larger. I’d carefully measure the outside to see if it is “ringed” as explained above. If not then 2 options other than re-boring are worth considering.
First, lapping may help and is easy. You’ll need a 7/16” ramrod blank a foot longer than the barrel. I can give you details on pouring the lap. Then use clover compound or valve grinding compound to lap the barrel from the breech end. 300 strokes should get you 0.001” from end to end.
The second option is to freshen up the rifling. I have done that work for folks. It takes some experience. The end result would be a bore the is the same diameter end to end or if desired, with some choke at the muzzle. It will load smooth and shoot like before but not have the perfect mirror bore you get with a new barrel. My original shots into an inch and a half at 50 yards when my buddy shoots it. It started out full of pits and crawdad holes.
Bobby Hoyt does great work and he charges little for the work involved. But a .62 may not be what you want.