A laser bore sight too is only designed to get the point of impact (POI) close enough to hit somewhere on a target at 25 yards. They are all going to be off by FEET at 100 yards. In other words they are a waste of time and money.
Best way to zero a bolt gun:
Remove bolt and scope turret caps then place rifle on shooting rest. Align the crosshairs on a target 25-50 yards away, I start at 50. Look through bore. The center of the bore will show where the bullet will impact, just imagine you fired a shot and that is where it hit. Adjust scope, then look through the bore. Repeat until the crosshairs and the center of the bore are aligned on the bulls eye.
Fire ONE shot, no point in wasting ammo at this time. Your bullet should impact within 1-2" of the bull. Readjust scope and fire a 2nd shot to confirm. Repeat if necessary, but 1-2 shots should have you zeroed at 50 yards.
You are now ready to shoot at 100 yards. This is where you may want to fire 3 shot groups. If you did everything right at 50 yards your 100 yard groups will need very little if any tweaking to be perfectly zeroed.
On a rifle where you can't see through the bore simply use a larger target. They sell poster board at Walmart for under $1. You can't miss something that big at 25-50 yards. All you need is ONE hole anywhere on the target to calculate how much to adjust the scope to get it zeroed for the 2nd shot. Use a ruler to measure if you need to.
With virtually all scopes each click on the scope at 100 yards moves POI 1/4", at 50 yards 1/8", at 25 yards 1/16". Once you get to 200 yards each click is 1/2". At 400 yards each click will be 1". Some scopes, especially inexpensive ones, may not move each click exactly 1/4MOA. But those numbers should get you close. For example if you're shooting 2" left at 100 yards. You should need 8 clicks right to be zeroed. On a good scope it will be exactly 8 clicks, but some may need anywhere from 6-10 clicks to get you perfectly zeroed.