A friend of mine just got started into C&B. Right off, he encountered a chain-fire that I had not heard of. He loaded his new Remington and on firing, he ignited three chamber. He took all the standard precautions, up front but did not pay enough attention to the nipples. The flash/ignition is not happen from cap fit but rather from the nipple threads to adjacent nipples. On rechecking, he found that his nipples were loose and he had not sealed the threads. Just thought I'd pass this on. ......
Be Safe !!!
Be Safe !!!