Been slowly working on this for a while for a post deer hunting project. Lathe went down last fall and had to rebuild the gearbox including making almost half of the gears which took a months to track down all of the required bearings and make the gears. Collaborated with another guy on a different site to finalize the particulars on the reamer since I was unable to make one at the time and he was interested in the concept as well. Got the 1st barrel finshed when the rona shut down the ranges and made supplies harder to find. .40" caliber with a 1.8" straight wall case so it's legal for the Limited Zone. Uses a standard cheap .40/10mm barrel blank like you'd use for a 40S&W or 10mm and .400" diameter bullets and cut down/expanded 30-06 or 308 type cases. You can also just resize expensive 45 raptor brass if you want to throw money at it. I prefer using 30-06 length cases so there is no wrinkle in the neck areas from the old shoulder from a 308 length case, but it's an option. Should be able to just hit 2600fps with a 20" barrel. Tests so far with the 16.5" barrel are on track. This first barrel is for an AR15 using the 800 series rounded lugged bolt and extension meant for 22-250. I am limiting the max pressure to 55Kpsi in this upper even thought that is below 22-250 SAAMI specs. I have a 20"-22" AR10/LR308 pattern barrel in the works for me as well as a 22" bolt action barrel for my buddy which will get run at higher pressures.