I checked my ballistics book, I will sum up what it says about foster slugs (if you want to read it exactly, order the book, or check your book store to see if they have it in, its on pg.307):
A Foster slug's groves that are molded into it provides a very slight spin, but the accuracy gained from the amount of gyroscopic stability is very little.
Research by Winchester shows that the turn rate of a foster slug is 1 turn in 24 feet.
Slugs without the groves still hit nose first without tumbling, but the grooves do give better accuracy over a non-grooved slugs.
1 in 24ft vs 1 in 24inches spin of a sabot round from a rifled barrel shotgun.
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