JPK,
The rifled barrels were ordered as full size blanks and then I turned them to size and monoblocked them. For the load info, see the above post. This makes a great deer/hog hunting
gun. Light and fast handling and I have never found the 20 inch barrels to be a handicap. The load data lists this load at slightly over 1400 FPS and I chronographed some out of these barrels at just over 1350. I know that is slow by double rifle standards, but if you compare it to other deer slug loads, that is darned respectable. No deer have gotten up to complain about it going too slow, yet.