Yes I shoot one ounce for trap. 400 shells from a 25 lb. bag vs. 320.
That said 1 1/8 will break more clays. I take umbrage with those that claim there is NO difference. There is a difference.
If and when I start shooting registered, I will shoot 1 1/8 at registered targets. I also shoot 1 1/8 at meat shoots, games, and handicap.
There is a difference. If you center punch every target, there is no difference. I center punch a lot of them, but not all of them. It's those times that the "extra" 1/8th can mean an X on the scorecard. There are no extra points for smoke.
Freedom is not free