Most try to shoot 5000 psi as a arbitrary "magic" number. And it's more for stock preservation than fear of Damascus failure. I'd drop your powder a little. In fact I try for 1100-1150 fps on clay targets. Very soft shooting loads and plenty to break clays or even harvest most game.
My standard load is 5200 psi, 1100 fps with an ounce of shot using discontinued PB powder. Very comfortable load to shoot and fits in hulls without having to add extra cards to fill up space. Pity they stopped making PB, it was a versatile powder for 12 & 20.
