I've started a new project, a Dedicated 10ga turkey shotgun. I started with an old H&R Model 176 shotgun shotgun that I've had laying around in the safe for 15 years now... I felt like it needed a new purpose in life. This will be built spefically for Eastern Washington high country. Lots of bush walking and rough rocky hills. Originally equipt with a 36" full choke barrel and wood stock with 1"x7" steel roundstock weight. This shotgun weighed in close to 10lbs or more! Way too heavy, way too long!!!! The plan: ~Barrel~ -Cut down / Face the barrel to 20" -Ream, Tap for chokes -Install Primos Jelly Head .690 choke ~Sights~ -Drill / Tap for front bead -Install HIVIZ fiber optic front bead -Install dovetail groove for rear sight -Install filp up fiber optic rear sight for long shots (for ruger 10-22) ~Stock~ -Install lightweight synthetic stock and grip (buttstock will be modified for a spring recoil system) -Install biggest recoil pad I can find -Install sling, sling swivels and studs ~Finish~ -Paint with duracoat or dip in water transfer I have most of the project figured out, with the exception of a few issues on the barrel work... I have reamed and tapped a few 12 gauge barrels in the past and have had good luck! so I figured when I started this project would be just as easy. Im having trouble finding the right tooling. I have decided to go with the Browning - Winchoke - Mossberg - H&R style of choke (I belive these are all interchangeable) I plan on buying / using THIS reamer to open up the ID. (firsrt time using an angle blade reamer, I have used a standard burr reamer in the past) Here is my Questions: What is the 10 Gauge (Browning - Winchoke - H&R) choke thread pitch? Where can I get that tap?