Thread: Unexpected POI shift

At the range I had an unexpected POI shift between two loads.

Ruger American .308, Sonic suppressor, sighted in at 100m with 150gr Nosler BT@ 2,650 fps. Then shot 130gr TTSX Barnes @ 2,850 fps - POI 2" lower???

I let the barrel cool and repeated with the same result. I was expecting the Barnes to impact same or slightly higher.