Confirmed cold bore and insurance shot today, 200 yards.You'll be fine at 350. I shot a buck this year with the 124 HH out of my 6.5cm and impact velocity was right around 2400. Complete pass through, didn't even find a petal. He was quartering away hard, entered behind left shoulder, exited the brisket in front of right shoulder. Heart was sliced in half. looked like from a petal shearing off.