Even tho Thunderbolts are/were cheap, and popular with hunters who might only make 10-15 shots per outing, they most definitely will “lead” the barrel. Bullet is uncoated/jacketed.Picked one of these up today. Took it to the range and put abkut 400 rounds of rem thunderbolts through it. One fte and one ftf. Accuracy was meh, but in its defense I shot it after shooting my m41 and 617 which sets the bar high for a cheap plinker.