May I humbly suggest the Nikon Slug Hunter 3-9x40 scope with the BDC reticle? No more holdover. Dialed in at 50, graduations for 100 and 200 yards are spot on. I would feel confident out to 200 yards with the Savage 220- Nikon combination.
I'll stick with the 2.5x8 VX3. Have you actually ran the BDC with the 2-3/4" slug? The trajectory is a rainbow, can't see the BDC matching.
I'll probably go with CDS ot custom shop BDC once I determine the actual slug. The AT are very accurate, but will wait for terminal report before I decide.