OAL , bes way to find good OAL, use brass shell (no powder or prime), push head in by head ,make so head will push (no slack, no tight). Then load into breech, like you fire bullet, chamber with bolt & eject. This give you OAL to lands, then reduce by 0.010" (english size 10 thou).This should give good result, for you rifle .Every rifle is diffren.