I shoot 7/8 of #8, full choke, load data (Alliant) says it's 1300 fps but MEC bushings are a hair light so I'm going to say 1260. If I do my job, I see absolutely no difference in comparison to heavier loads.
I use Extra-Lite (15.4 gr.) with either a Rio 209 or Federal 209A primer, and a CB-6100-12 wad in s Federal Top Gun case. I get 2-3 reloads, then dump them. Very soft recoil, with a velocity of 1200 fps. Ben at Alliant told me that the secret with this recipe and case is to use a hotter primer. I initially tried Ceddite 209's and Fiocchi 616's, but got erratic ignition. The hotter primers make it into a great load, however.
I also load Winchester Universal cases, same powder charge, but with a Fiocchi 616 and a CB-1078-12 wad. The beauty is that I have an almost unlimited supply of once fired cases, as no one else loads them. If you don't try to wring more than a couple of reloads out of them, they work just fine.
A denser patern makes more consistent hits. Use 1 or 1 1/8 ounce loads for that extra target or two that separates 1st. place rom also ran. Why do you think the ATA limits max. loads to 1 1/8 oz? Clyde
My usual load is 24gram or 7/8oz shells at 1325/1350fps (normal load for International targets) at almost everything, including sporting clays, Int. Trap/Skeet and American Trap and Skeet. Just yesterday shot 4 rounds of American doubles trap with 8's first barrel and 7 1/2's second thru 30/35 chokes (kicks comp chokes at 16,(47) 22,(42) 27(44) and 16(49) yards. Last round the targets sure looked (BIG). If I did my job the targets broke! Some of you will not believe it, but the targets from the 27 yard line broke well if I put the shot on the target. I just ordered samples of 3/4oz 12ga claybuster wads to see how well they will do. I will set them up to shoot at 1300-1350fps using Aliant Claydot in tapered wall hulls.