Paul--The early Farmingdale had a "freebore" that was nowhere near the original chamber configuration. Mr. Droge had a misguided notion of what a chamber to shoot paper patch should look like, and frankly screwed up a lot of barrels and caused a lot of guys a tremendous amount of angst and frustration.
Why he didn't take an original and do a chamber cast and copy it is beyond me. Now a couple of guys, led by Orville Loomer, have done just that. They have had chamber reamers made to cut these original configuration chambers, and they are smaller in diameter at the case mouth than a standard chamber, and have a quite different leade angle.
I have a 15 pound Shiloh 45-90 cut with that chamber reamer, and it is EXTREMELY accurate. It will only accept paper patched ammunition, a grease grooved round will not chamber.
A standard chamber can usually be made to shoot paper patched ammo fairly well, but the loading procedure requires that you adhere to some very narrow guidelines to make it work. Most guys with standard chambers get creative with their loading and step out of the box and don't get good results as a consequence.
