Right if it is made here in the USA with imported steel from England then it would be the same steel used as from any other place. Due to it must meet USA minimum standards for use in making a gun barrel. Meaning it must be able to withstand so much psi & so on. My point is if it was made in lets say Spain as in Spain imported the steel under the grading system Spain would use & the law states in Spain they could use a softer steel to make a gun barrel. This would not be allowed in the USA if it was made here keep in mind. Spain could use the softer steel to make the gun. Import it for sale into the USA & pass it off as just as good. Totally legal when it comes to muzzleloaders like I said no body to govern this like is the case with a rifle or shotgun & so on in the USA. Why the USA would have to make a muzzleloader barrel out of steel that is able to withstand higher psi & so on you might ask? The law says they have to if made in USA no matter where the steel comes from imported or not it must be able to withstand a set psi. This includes muzzleloaders they are not tested to see if they can withstand it like other guns but are required to be made out of a steel that can withstand the higher psi. In other words the same steel used in most other guns required to be tested in the USA. So if it has Made in U.S.A on barrel it is a steel barrel that can take higher barrel pressure. If it was made in another place like Spain & the finished product imported for sale into the U.S.A it could not. Yes they can import them & sell them here a muzzleloader that is. Other guns rifle shotgun handgun that is not a muzzleloader to be imported into the USA for sale that have a body to govern them could not do this if made overseas with softer steel. they would not be legal for sale in the USA. This is why you hear about some muzzleloaders blowing up when no user error was made. Remember softer steel is much less costly to machine into a gun barrel the trade off is it can't withstand a diet of 30,000 + psi over a long time. It cost less to make it saves money so who cares is the way they look at it. I would care knowing most hunting loads produce that kinda pressure every shot. If an inline muzzleloading manufacturer refuses to tell you in writing that their rifles have been designed and tested to withstand a constant diet of 30,000 PSI peak pressure loads safely, their guns should not be sold, much less used.