Inspect a few rounds and see if the lead is actually pitted. If it is then accuracy will most likely be very poor. In addition older Thunderbolts have been known to cause leading in some barrels. Its the reason I won't ever shoot it again. Some do not have this issue but it happened in three of my firearms. Maybe it just isn't worth the time/effort to clean it up.
Personally I would drop in the misfire can at my local range.
Personally I would drop in the misfire can at my local range.

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