As far as the best performing slugs as far as trajectory goes here are a few.
Hornady H2k....Hornady SST.....These two slugs more that likely will not stabilze well in a barell with
your twist.
Winchester Partition Gold.....a #1 choice
Remmington Core Lokt ultras.....a#1 choice....and my personal favorite, its all I use right now.
Lightfields.....lacking in trajectory...but very accurate...worth a try
I am sure others will suggest some more. But as always check the trajectories, and make sure they are appropriate for your expected range.
My savage 210..