aimatdeer:
This question will no doubt bring a bunch of responses about the merits of expandable vs. fixed. I for one shoot fixed, but I do know that there are many reliable expandable heads that will bring down game just fine. I've never shot the rocket heads, but to sight in any head, you have to sacrifice one of them and just shoot it at any target you normally shoot at.
Hopefully, someone else here can tell you more about the Rockets.

Good luck with your changeover!