You could check with Lyman but I believe they are interchangable as long as the ignition system matches and they are made for the same rifle. Many companies make different calibers out of the same barrel stock. That is why even though the caliber might be larger in this case, the barrel is actually lighter because of course, more metal had to be removed to make the larger diameter.

Give Lyman a call and ask them. Very helpful people. Their telephone number is 610-756-6271. That is Dixon Gun Works that does all the technical and service work on the rifles. I am sure they can answer the question.