Ran across some Fiocchi 12 ga 7/8 oz Low Recoil Training Loads, so I called Fiocchi re chamber pressures. Per their tech supt guy, who consulted with their ballistician, these shells are designed to produce 6000 psi in 12 ga, and do not exceed 6600 with normal production variances. Seems like a good, convenient load for old doubles. My local emporium has them for $7.49/box, have seen them online for about $6.70.
Available in #8 and #7-1/2, at 1200 fps. Why has there been no buzz about these shells, or have I just missed it?
They also offer their 20-VIP and 16-GT, both at 7500 psi design pressure. Seems like a reasonable solution for older smallbores.