Several years ago my grandfather while yardsaleing found some old 30-06 black tip ap rounds and some weird rounds with fully blue bullets, the casings are the same as every other round we have and they have a “5(or S) T W” in clockwise rotation on the bottom.
Does it have a hollow point?
Yes, it has a hollow point. And for clarification, the letters/numbers on the bottom are are the 12:00, 3:00, and 6:00 positions in a clockwise direction.
Then you have a non-factory load using a Barnes XLC bullet, as indicated above by Dan. The case was made by Twin Cities Arsenal in 1955.