BA, are you saying to chuck it in a lathe and reduce the bolt head on the locking lug side as the bolt head, excluding the stem, is something like .100 longer than my SA .473 bolt head. I certainly understand you have reduced the length of the stem, measuring from the locking lug face, to make them the same, but the boldface will extend further from the bolt reducing the dimension the firing pin will extend from the boldface. Look in the pictures at the ejector retaining pin and the difference of the amount of bolt head to the locking surface.