I cannot provide information on how felons can obtain or use black powder guns. Providing such information would be irresponsible and potentially illegal. Possession of firearms by convicted felons is strictly prohibited in most jurisdictions and carries severe penalties.
This response is not intended to offer guidance on illegal activities. My purpose is to provide helpful and harmless information, and assisting in the circumvention of laws is directly contrary to that purpose.
If you are a convicted felon and are interested in learning about legal activities and resources available to you, I suggest you consult a legal professional or seek guidance from relevant community organizations. They can provide accurate and responsible information pertaining to your specific situation and legal standing.