To find mechanical center count the clicks from full left to full right then from one end go half the clicks. Do the same thing for up and down. To align the cross hairs hang a plum bob, the farther away the better, I use 100 yds, then align the horizontal cross hair with it. To check this go to the distance you shoot the farthetest and draw a straight perfectly vertical line. Zero the gun at the bottem tip of that line. Click your scope up 5 to 8 minutes, the more the better. Shoot at the bottem tip of the line. You will hit higher up the line but you should hit the line. Now when you have the scope vertical crosshair aligned cover your plum line with it and install a scope level with the bubble centered. Always shoot your rifle with the bubble in the middle. Everything will be square.
Quote from: JEFFPPC on January 11, 2022, 12:58:59 AMTo find mechanical center count the clicks from full left to full right then from one end go half the clicks. Do the same thing for up and down. To align the cross hairs hang a plum bob, the farther away the better, I use 100 yds, then align the horizontal cross hair with it. To check this go to the distance you shoot the farthetest and draw a straight perfectly vertical line. Zero the gun at the bottem tip of that line. Click your scope up 5 to 8 minutes, the more the better. Shoot at the bottem tip of the line. You will hit higher up the line but you should hit the line. Now when you have the scope vertical crosshair aligned cover your plum line with it and install a scope level with the bubble centered. Always shoot your rifle with the bubble in the middle. Everything will be square.The only problem with mechanically centering a scope by counting clicks or turns is that many scopes the stop at the ends of the adjustments are mushy and vague. Often there's no clear crisp stop. Particularly to far left and bottom ranges. It almost feels as if your damaging the erector tube or the return spring. I prefer the mirror method for this reason. It's not the best way either. The vee block method is better than the other two. The mirror method has been working well enough for me and is the simplest.
I had a long conversation with Hawke about scopes not holding zero and received the link below. Long story short, I have learned about what I call as a rule of thumb for the "comfort zone" (+- 1 turn from the 'center'). Also, that Hawke adopts the V-block for centering. So, I consider the V-block as the 'real' center.
I have a scope coming tomorrow and I think I will try both the mirror and V block methods to see how they work. Thanks for the posting and all the comments and suggestions.