I've recently been using laser boresights, the kind that fit in the chamber. Blue loc-tite on the base and rings. Torque the rings to the recommended spec. The last .308 I did, I lined up the crosshair with the laser at about 75yd (as far as I could get at the time) and that had me on paper and grouping at 100yd right away. 3 shot groups, adjust elevation and windage, repeat, and keep the barrel from getting too hot.
I've always struggled with manual boresights. I like the laser ones a lot better. And do you have a good shooting rest/bench? I finally caved and bought a lead sled and I'm kicking myself for not having done it sooner. It makes a huge difference.
E: since you have a Vortex
https://vortexoptics.com/blog/how-to-properly-mount-a-riflescope.html
Whoa! Thanks man. Will check the link when I have time. Wife is home now. I have a laser bore sight kit and I have a lead sled. I’ll get to work and report back!
If you wanna get real real fancy with nice scope and long range build, you can get a lapping bar and lightly/slowly lap the scope rings. And glass bed your action, yada yada.
But that's not necessary to down a deer, obviously.
I usually do mine indoors, and set the crosshair centered and an 1" or so high at 20-30'.
I made a small chart that I tape to the wall.
Gets me one paper and then I dial in from there.
Also, I prefer to keep muzzle laser so that it fits any caliber.
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