Buzz. I think you are agreeing with me. I mentioned the word Best brings different meanings with this crowd.
Would a Best gun that was now sleeved still be a Best gun? According to the market, hell no.
My point, is that a monobloc gun was designed to have tubes inserted into a solid piece of steel. A sleever was put that way with a bunch of different parts that are held together with old braze, solder, weld, or, whatever. They pass proof, and they fail proof, too. It is pretty rare for a new monobloc gun to fail proof.
Canvasback is working on a photo for me of a monobloc barrel that passed pre 1924 triple French proof at 27,000 psi. Ive seen a few of these barrels, the great majority of barrels that did that were of monobloc construction.
Ill post the photo when it arrives, likely in a different post detailing proof markings and level of proof at St. Etienne.

Best,
Ted