Re: Ackley Barrels?
Ackley does not make barrels any longer, nor did Savage ever chamber any factory gun in a non SAAMI spec'd chamber or a barrel other than their own.
What does the stamp on the barrel say? Post pictures if you can and we will try and help you to figure out what it is.
It would seem you have a Savage action with an aftermarket barrel of some sort. I have never seen one, but heard that ackly made his own barrels, and then worked with a company out of Salt Lake City called EMDEKO to produce some 5 groove button rifled barrels with his name of them at one point. These barrels were typically built in to Interarms Mark X rifles and not sold as blanks. Perhaps you have an old pre EMDEKO Ackley barrel that was just chambered 3 years ago?