What to look for (seeing this is a 1905 gun).

Bore condition - sharpness of lands / grooves, No pits

Lack of "Frosting" - at the beginning of the barrel in front of chamber and any length of the barrel - NOTE, I don't have a problem with Frosting as long as the rifling in the 2nd half of the barrel is good.

Barrels "ring" true - hold them by the hook on your finger
and tap the muzzle with a spoon - both barrels should "ring"
like a bell. If not, rib is coming loose somewhere.

Half cock of hammers work - do a drop test onto something soft
like carpet at both full cock and half cock.