At your own risk!
I have been using shot data with my Lee 7/8oz slugs.
I researched that a slug offers less resistance up the bore than the equivelant shot charge, so your velocity will be higher with the slug.
I would recommend that you give the mould a tap with the soft mallet when squeezed closed- prior to pouring each time to make sure its shut all the way, otherwise mine sometimes throws a slightly oversized slug.
Personally I use Lee 7/8 slug, Win primer, Win AA hull, 20gr Greendot, pink Claybuster 12AASL wad with cardboard disc (stops the slug from sticking to the wad) and a softish 8 point crimp.
This will put you into the 1350fps range and is quite enough IMO.. Blows the snot out of the wad and any faster results in decreased accuracy.
Theres a bunch of info in the Alliant data book- but these are using Bluedot and an extra couple hundred fps, just a whole lot of extra recoil for nothing.
My own slow loads bughole at 25 yards and pieplate at 100. Likely the most fun you'll ever have with your clothes on.
Use at your own risk!
Cheers!