Same accuracy 1st or 15th shot. The friend who gave it to me did all the usual trick shots with it, striking matches, splitting playing cards and splitting a ball on an axe and breaking clay pigeons. Of course he was heavily involved with a BP club in Florida for years and shot several times a week year round.
It does appear that some parts of the barrel have been glass bedded. Hard to tell because the builder's use of beeswax to close gaps is pretty extensive but I think it is glass bedded. I have never had the barrel out but glass is plainly visible around the nose cap