I am not aware of the ignition system on the Thunderbolt. And I understand that the name can be deceiving. So I will ask.. it shoots a 209 primer instead of a #11 or musket cap, right? And the ignition system is not exposed, meaning... looking at the breech can you see the primer sitting there? If you can I would suspect it can not shoot blackhorn 209.

A certain ignition system is required to set off the blackhorn in a consistent manner. And when I was looking at a 10 ounce jug of it the other day, debating if I wanted to give Gander Mountain $34.00 for it... I asked myself... does the present powder I shoot get the job done? And is it that important to shoot blackhorn? So if you have doubts about whether your rifle will shoot it or not, its an expensive gamble. Especially if the rifle shoots good with other powders.