Scope height from barrel center line
2 replies to this topic
Posted 12 August 2007 - 09:40 AM
There are two methods for measuring Height Over Bore (HOB).The quick easy method for measuring HOB is to just measure from the center of the scope to the center of the bolt (along the ejection port side of the rifle). This does not produce an exact measurement, but it will get you ‘close enough for government work’.The second and most accurate way to measure HOB you'll have to remove the stock and use a caliper.Step 1: Measure the diameter of the scope (outside of the housing). This is variable L (for lens diameter).Step 2: Measure the distance from the bottom of the scope to the top of the barrel. This is variable O (for offset).Step 3: Measure the diameter of the barrel at the point DIRECTLY below the end of the optic (i.e. where you just measured from in Step 2). This is variable B (for Barrel diameter).Step 5: Compute the HOB. HOB = ( L / 2 ) + O + ( B / 2 ) and write it down in your notebook for later use.
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