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If you measure the length of several bullets you will notice that they vary by several .001". If you look at the very tips of hte bullets you will also notice a lot of deformation. Therefore you can't rely on COL. The bullet ogive measurements is a little more accurate.
We say start about 0.003" backed off the lands. Then find a good powder. Then reduce or lengthen the COL.
Also make certain that your max COL will feed from the magazine. A lot of time it is Mag Length that is the limiting factor.
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