The 8 peddle claybuster wads are windjammer clones. They are one of my favorites.
I do not care for the high velocity 3+ dramloads for serious Trap shooting. For me they lead to flinching problems.
You mentioned that you are looking for the right bushing. I have found thebushing charts to be HIGHLY UNRELIABLE. A 1250 to 1300 fps load is a hot load.
I would STRONGLY recomend that you purchase a reloading scale and bracket ALL chart recomendations 2 above and 2 below what a chart says. I learned this the hard way with my MEC 9000G. Do not go for a hot load without verifying the charge using a powder scale.
Most of the claybuster buster wads come with a reloading info flyer inside the bag of wads.
The first load I would try for a high velocity 1 1/8 oz load would be a load using Alliant UNIQUE or Hodgdon International Clays. I would avoid the new Win AA Shells for hot reloads. Go with the STS hulls.
Check out the Alliant and Hodgdon web sites for reloading info. I have couple reloading manuals, and high perfomance loads are listed, but not for the claybuster wads. I would advise you not to swap components (hulls, wad & primer) from pressure tested loads published.
More than one money / turkey shooter has blown up his shotgun EVERY year using homebrewed hot loads for one reason or the other. This can be confirmed by doing a search on www.trapshooters.com .

D-squared