I shoot 1oz #8 for singles and doubles, and an occasional round of caps. My standard caps load is 1 1/8oz #7 1/2 @ 1145fps.
If I shoot 300 or 400 1 1/8oz loads in a day, my shoulder is sore the next day and I'm paying more attention to it than to my shooting, and my second day scores show it.
I should mention that I sent my unsingle barrel to Kerry Allor and had him turn it into a dedicated 27 yard handicap barrel. For singles, I honestly cannot tell the difference in most breaks between 7/8, 1 and 1 1/8oz loads with this barrel.