Re: conetrol base adjustment in alignment with bore
This how I do it . It may not be how the gunsmiths do it but it works for me .
Buy a shot saver the type that has a mandrel that goes into the bore.
I use a Tasco shot saver.
First centre the scopes reticule . Adjust the windage all the way to one side ( don't force it at the end when it starts to tighten stop ) . Then adjust it all the way back counting the clicks. Then click halfway back .
Mount the gun in a vise so it is plumb .
Set up the scope with base side screws still loose but they hold the scope from slipping easily.
Adjust the scope until you can see the shot saver grid pattern .
Plumb the scope reticule off the action and then parallel the shot saver grid off the scope reticule . They don't have to be in centre yet just vertically parallel .
Tighten up the front mount first a bit at a time left and right watching the crosshair on the grid to get it centred in the vertical plain . Get the screws almost tight but not fully tight because you still want some give for the rear mount to centre and move the tube . Then do the same for the rear mount but watching that you don't move the cross hair off it's centred position . When the rear mount is almost tight test any variable power change . A good scope should change power and the reticule should not move from the same position .
If that checks out then a bit at a time tighten each side to fully tighten while still watching the reticule stays in centre .
Only left to right is required the vertical centre .
Of course eye relief and reticule plumb has to be addressed during the setup. This does not address elevation Zero .
I can get even cheap variable scopes tracking well with this system .
Last edited by Bullet bumper; 02-13-2013 at 08:06 PM.