Not sure yet... Are any available? If not I may have to order a custom one.
I've looked around on websites a bit and PTG has a rougher and finisher in stock. But they don't have their prints on the page so I don't know what neck clearances are and don't know what freebore would be. The clymer that the Smith used on mine had none or nearly none and that wouldn't work if you want to shoot 180gr or heavier.
4D rentals has one with a 0.340 neck and .090 freebore. This one would barely work for no neck turn if you have Peterson 284 brass. Most of my loaded neck ODs are 0.370-0.375. but, I don't know if 0.090 freebore would be enough for the heavy bullet application. And I don't know what kind of shape that reamer is in. I'm leary about rental reamers now that I got burned by a 40 year old reamer. The smith owned it... Didn't rent it. So I realize that's an irrational fear I now have.
Neither Manson nor JGS have this one as a standard reamer on their list, so i know one if not both of them would charge more for it.
So I was thinking of possibly talking to Manson or JGS sometime in the next 6 months to get plans started for one. I like the cartridge and I figure if I get a quality reamer then I'd be set for barrels for life. . and their lead time is pretty long