To get crosshairs leveled, I have been using the orange bubble level kit. (I’m thinking about leveling the rifle and projecting the reticle to a plumb bob.)
Get it torqued with fit to shooter right….correct eye relief.
Then get to the range. I get the focus set to see the reticle clear against the sky on max power and max parallax.
Then I look down the barrel and get it on a 50 yd target. Adjust the scope to be in alignment. Shoot 2 shots. Adjust to zero.
At 100, I shoot 2 shots. If they are within 5” of bullseye, I shoot 10-20 to find group center. Adjust scope to zero. Then shoot 5-10 to confirm.