The Barnes recommended minimum impact velocity is around 2000fps. Anything over this and they open very readily. Wish I took a picture of it but I put a 375 insurance shot into a downed cape buff and it first passed through an ear, under the ear was a perfect star entry wound, it was at full expansion after going through the cartilage.

Here are the Barnes I have recovered. L-R
.375 270 XLC, zebra @ 125yd, diagonal front shoulder to rear ham, 2800mv
.375 270 XLC, water buff @ 50 yd, between eyes recovered behind skull, 2800mv
.257 100 TSX, mountain goat @ 390 yd, shoulder to shoulder under hide, 3600mv
.257 100 TTSX, large russian boar @ 5 yd, entry in shield, unknown recovery point, 3400mv
.257 100 TTSX, large russian boar @ 7 yd, high entry in shield, unknown recovery point, 3400mv

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