When I put new, or reused, wheel bearings in, I spin the wheel hub as I tighten the nut. IDK if it helps, but my theory is it keeps everything straight when the bearing is seating.
crobinson....I guess they do know how to actually pack a wheel bearing and not just smear grease on it, right? I have heard of some people just smearing grease on the outside of the bearing and not actually packing it, to force grease inside the bearing.