Here is one post from here that was brought up a few days ago. You will find this very enlightening. I would certainly start your loads just off the lands (say .005"), work up a good load with that OAL, and then when you find the proper bullet/powder/charge combination, then vary OAL (.005" at a time)till you get best accuracy. And do yourself a HUGE favor and save yourself a lot of headaches: buy a stoney point bullet comparator or the comparator at sinclair international.
P.S. Read through the whole post before making up your mind on how you will do it for sure, then ask more questions later.
[ 07-14-2004: Message edited by: shilen30 ]