I have been known to take boresighter/colimeter with me..fire 3 shot group..hopefully into neat wee triangle...then with rifle unloaded use colimeter to adjust the Xhairs in correct direction...if youve never seen/used one...its a thing a bit smaller than coffee cup that has insert that slides down end of ya barrel.when you look through scope into it,you can see a grid with darker horizontal and verticle line through centre....grid squares are close to 1"/25mm at hundred yards...so if you had shots hit say 6" left and 3" low...you just look through scope and move Xhairs corrispondingly...this is similar to what FTX does but negates the holding steady on target bit......most folks just measure,either by eye (guilty your honour) by grids on target or ruler...and adjust accordingly.
DONT FORGET to take colimetre back out of barrel...have seem burst barrel photos from fella who had brain fart and forgot.
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