I had cast some LEE 7/8 oz slugs to try in my Tracker II. They shot very nice groups @ 50yds, and were ok @ 100. However, I could not be confident to hunt with them, as I felt the power level was too low.
I had also cast and shot some of the Lyman 12ga 537gr slugs. They shot well, but were too rough on me at the range. I sold that mold, after I found a 2 3/4" 1 oz sabot from Federal that shot really well for me, and were not so expensive as others. I eventually bought 2 cases on an auction site. After the initial workup of about 20-30 rounds, I've only shot 17 rounds for the past 3 deer seasons........6 the 1st [1 deer], and 5 the 2nd [no deer] and 6 this past season [1 deer] . At this rate, I can pass on the remains of the 500 rounds with the Tracker II to one of my sons!