If the head of the stock has been acraglas bedded 1 1/8 oz at 1200 fps target loads are reasonable.
If not, in light of the age of the wood, I'd suggest 1 oz. at 1200 fps.
I use B&P Comp One 7/8 oz at 1160 fps for skeet. Fiocchi also makes a 7/8 oz. target load.