If they're British and CIP-approved for standard proof guns, they should be OK in Damascus in terms of pressure. However, higher velocity target loads might generate more recoil than you want.

I just picked up a couple flats of Rio 7/8 oz, 1200 fps. Made in Spain, carrying the CIP logo. I'm going to see how they work in a 6# Brit 12 today. My 7/8 oz reloads are in the 11-1150 range. But my usual target gun is heavier, and I expect they'd be fine in that gun.