You might be surprised that many people nowadays dump problem guns on the used market. I have become very leery of newer guns for sale that were previously owned. I don't think that there are many people left with what was considered character in the old days. That being said, with a used gun, you get what you get. Sometimes the seller will make good on problems, but don't expect them to go over every used gun with a fine tooth comb. More likely than not, your bulged barrel won't have any bad effect on accuracy. It just might be harder to clean that one spot. I have found that most folks nowadays don't really do any handgun shooting where they would notice an inaccurate gun from one that is super accurate. That is because they don't shoot handguns at any appreciable distance where one can discern the difference. "It's the dismal tide!"