The smith showed me a crack in the receiver on the water table in the thin section on the right side.
Those cracks do show up on Flues models, especially the very light 20's. Used to be a contributor here, Greg Tag, who was keeping track of Flues failures. You do want to shoot light loads (low pressure, light shot charge, moderate velocity) in the light 20's. As I recall, on at least a couple of those "failures", the owner had been shooting promotional loads from one of the big box stores. Those shells aren't heavy in terms of shot charge, but they make them to generate enough recoil to operate autoloaders that may get cleaned once a decade or so. Better to go with light reloads or something like RST's. And if the gun has 2 1/2" chambers and you're reloading 2 3/4" hulls, remember to back off even more on pressure. Per Sherman Bell in Double Gun Journal, although the pressure increase as a result of the longer hull is usually only a few hundred psi, it can be more than 1,000 psi. So add in more of a safety cushion.
