I would suggest shooting the gun with TSS loads before you go out. The patterns can be extremely tight at 20-30 yds. I have 2 20ga guns set up with TSS. Mine has a scope and my wife has a red dot. With mine the POI did not change. It doesn't change with Long beard, Hevishot or TSS. My wife gun changes POI several inches with different loads. It would have made a difference at 20-30 yds.