Last week I took a box of Win Super X, Federal Classic, Rottweil Brenneke, and Rem slugger 2.75" slugs out back and fired a three round group from each one. I fired at 1.5" dots colored on a 24 x24" cardboard with a marker from a measured 50 yds. for a rest I knelt in front of a saw horse, with no sand bag. I fired each group in rapid succession, but let the barrel cool between different ammo. My gun was a Mossberg 500 using a smoothbore barrel with rifle sights. My results were as follows:

Brenneke didn't group at all, but a flipped rear sight was the culprit on that one. the Win X made a 1.5" snowman +3" above POA and at 1 o'clock; 2" Remington Sluggers grouped at 1.88" above POA at 12 o'clock; and I got a 2.25" 3 shot group with Federal Classics that was 2.5" above POA at 12 o'clock.

this is for from scientific, but confirmed for me that any of the above amo can get the job done for me.
Incidently, when I fried my last brennke by itself it hit the target dot dead center. hopes this helps answer your question.