I've never worried about where the lands are. I just use mag length as a starting point and if it doesn't shoot then it doesn't shoot. Can get most projectiles to shoot at some kind of acceptable level of accuracy using this method and only worrying about powder charge. The only time I've had loads that just plain won't shoot is when the projectiles is completely wrong for the twist rate. With hunting rifles it makes me laugh a bit when guys get a good load going and then start playing with seating depths and tell themselves that a . 1" improvement in group size is because of the change in seating depth, I guarantee your ability to shoot the rifle has more of an affect on group size, choose a "good" load and load up a dozen or so projectiles all at the same seating depth and go shoot groups with a hunting rifle, your group sizes will vary the same or more than the variations "found" in your seating depth tests because unless you're an excellent marksman and the rifle is a bench rifle you're never going to get enough consistency to actually believe those variations are directly accredited to seating depth. Some fellas seem to like making things hard on themselves
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