I have a Black Mountain Magnum rifle. It has a musket cap ignition. I have never had a ignition problem with the rifle. I so shoot musket caps. So Big Bullets I am not sure what the problem might be. But that is one rifle that is suppose to shoot any powder, even pellets. So when you say you have an ignition problem with that rifle, I agree.. I would be concerned also.

Seem funny that T/C customer service loaded with black powder and then claimed no ignition problem. If the rifle were mine there is a few things I would try with the rifle to get it shooting, but then... I love to tinker.