I bought a Interarms .270 a number of years ago and discovered the barrel was marked PO Ackley, Inc. on the top.

Does anyone know what significance the marking is? Is it a Ackley barrel if so, does it add value to the rifle. Should it effect accuracy?
Is this actually a 270AI?

The ones I've seen stamped with his name were rifles he installed a barrel on. If it is just stamped 270 then it shouldn't be an AI. Either way you can fire factory 270 ammo. The fired case will verify what it is.

To some people having his name would add a little value. But, I wouldn't call it a collectors item.

Thanks ramrod

Ackley also built and rifled his own barrels when he was at Trinidad SJC. I have seen his old barrel making machines and they are something to behold.

Seamus,
Ackley installed his barrels on a lot actions when he alive. He also offered a line of rifles using a variety of commercial Mauser 98 pattern actions from about 1971 to 1975 in his Salt Lake City shop. He used the action from Interarms on a lot of them. Most of them were built in standard calibers, but the AI calibers could be requested. They are worth more than the rifles built completely by Interarms - most books list the price from between 400 to 500 dollars. There are shooters out there who collect rifles built by Ackley, and I have seen some of his rifles going for around $1000 dollars at a few gunshows. Like ramrod340 said, they are not collectors items per se - but there are those out there who will pay good money for a rifle with an Ackley barrel. You may have a .270 AI but I would bet it is the standard .270 Win (have it checked). I have one of these rifles in 7x57 and it was my main hunting rifle for many years. Accuracy is great as long as I seat the bullets out (it has a long throat for the old 175 grain bullets). It also has a heavier medium weight barrel. Functional reliabitly was perfect. I have a friend who has one in .270 and it is a real tack driver. All of his brothers try to borrow it during hunting season.

Ackley made and installed his own barrels at a number of locations. His first barrel-making shop (before WW-II) was on Oak Street right at the South Umpqua River in Roseburg, Oregon. (A motel now stands on the site.) He also made barrels in the Salt Lake City aea, and in Colorado,

I am led to believe his last barrel-making equipment is still in use, by Siskiyou Gun Works (Grant's Pass, Oregon), in the hands of "Chick" Donnelly and his associates. Barrels made on that machinery by Chick won the first 7 annual Coor's Matches in a row, BTW.

Excellent info guys, thanks so much.

If he built it,..it will shoot