Hands down, my TJ barrels with 62-65.5gr slugs have been the best for me. I've hand loaded the Griffin 78gr RBTs (very accurate and probably the top-end for the 1:26" TJs), but I helped sponsor Orion Iguana Hunter's efforts some time ago to produce revised magazine lids that would seat the 62gr Varmint Knockers and 65.5gr (and the older 66gr) NSAs in the Maverick mags.
That ammo has been reliably accurate well over 200m in calmer / lighter wind conditions. They're all affected by wind drift being in the 0.13-0.142 range, but it's very manageable compared to all the lighter "off the shelf" slugs in the 40-55gr range (which all drift too hard for my taste).