Really cus the
Stinger NI .......IBO Speed: 304-296
Brute LT...........IBO Speed: 308-300
Is your brother using a heavier grain arrow or broadhead cuz the brute shoud be faster by what PSE says. I was getting 287 out of mine last year with arrows at 357g. Not sure your brother is getting everything out of his bow...not a pro mind you