The reamer came from Brownell's
It was sold as Brownell's Straight Flute Long Forcing Cone Reamer. The container was marked Chadwick and Trefethen Inc. New Hampshire.
www.chadwickreamers.comFrom the old Brownells catalog.
"Double-duty reamers lengthen short chambers to modern standard or magnum lengths and cut the new long forcing cone at the same time --OR-- will cut a long forcing cone without lengthening the chamber for the gunsmith seeking improved shooting performance for his customer. Flute placement, relief and angle are designed to give the best possible results on all types of barrel steel (except chrome lined barrels, or course) The 1 1/2 long (approximately) forcing cone created is performance proven to give optimum results in any length chamber.
Reamers are ground exclusively for us from special, select tool steel by one of the oldest and respected manufacturers of reamers in the US. Quality and performance is 100% guaranteed. Plus, the hex-drive permits use of a socket and T-handle when tap handles will not operate. Lathe setup not required
SPECS: 5 3/4 long overall. 1" long hex section 1/2"............... 1 1/2 long forcing cone cutting section. 7 flutes, straight cut.........""
I cut some of the stuff out because it applied to other gauges. Think I got everything right. Typing and eyesight are limited here at the computer.
That's what I know.
The reamer worked fine on the shotguns that I worked on. If I remember I borrowed a chamber length gauge since I wanted the chambers to accommodate 23/4 shells and also measured to assure there was sufficient barrel diameter.
I am in Northwest Montana.
I'm thinking $35 shipped. My old catalog shows them at $80.
Thanks,
Bill