In most states the carry laws are the same for black powder as any other weapon. The NRA-ILA website has an extensive data base that may help for your area, or the local law enforcement officials are a good place to inquire.
Yes, it is illegal to carry a handgun on or about your person without a license (other than in your vehicle if you meet the "requirements"). But a black powder firearms is not considered a firearms under Texas law.
Yes.
Technically,
No, Texas does not allow open carry for handguns. Rifles and shotguns are not listed in the unlawful carrying weapons law, thus are legal to carry.
I imagine state laws vary on this but in Texas you do not have to call anybody to transfer a black powder gun.
Yes, stun guns are legal to carry in Texas, unless the stun gun is in the shape of an item that is already deemed illegal to carry, such as a baton, sap, or brass knuckles.
Most major grocery stores in Dallas, Texas carry Calumet Baking Powder. Walmart and other big box stores also carry it.
Own? yes. Carry? no. if you are seen carrying an airsoft replica in public it will most likely be considered a real firearm by civilians as well as law enforcement. Do not carry or brandish an airsoft gun in public ever. it is a good way to get shot by the real thing
You will need to consult with a lawyer for a legal and correct answer.
You need to talk to a lawyer for a current, corrrect and legal answer.
No, only peace officers can carry a handgun unconcealed. There are many that are considered peace officers in Texas.
No. They are illegal to possess. A butterfly knife is considered a switchblade under Texas law. A switchblade is a prohibited weapon.
Provided you follow all Federal, State and Local laws, yes.