A companion and I once took turns shooting his 1890 H & H on a clay pigeon grouse butt and shot it until it got so hot it seized and wouldn't open. We'd set it aside for 3 or 4 minutes and it would open, eject the empties, and shoot perfectly until the next "seizure." We put around 750 rounds through it that afternoon, which was not particularly hot, and it never missed a beat. Just had to let it cool down now and then. KBM