I just had the throat lengthened in my .260 Rem barrel, the 139gr Scenar touches the lands at 2.950" (AIAW), the 123gr Scenar jumps about .060" and still shoots lights out (1/4 to 1/2 moa). The nice thing is that sinse the 139 is one of the longer match bullets (base to ogive) I can seat any...