Best boresighting kit?

The collimator style is the best universal

Your eye. Remove the bolt, sight the target through the bore, then Adjust scope to be centered in same target.

+1.
I've been shooting >50 years and I've never used a laser or any other type of boresighting kit. Like others mentioned, I've always used used my naked eyes to line up the bore w/ the scope. It's easy and fast, as portrayed in this video. I did this the other day and was 1" off at 50 yards, but I usually start at 25 yds. I've done this w/ bolt actions and "crack" barrel actions. IIRC I also did it w/ 300 BO AR-15. You don't even have to be at a gun range to use this method. I frequently do it at home, sighting in on the door knob of my storage building across the street in the back yard. In the video, the guy left out one VERY important tip. When using this method, you turn the scope adjustment knobs the OPPOSISTE of the usual markings. For example, if the bore is centered on bullseye and the scope reticle is high, you'll turn the adjustment for the reticle UP, not down. Don't ask me to explain as it took way too many years for me to kinda understand it. If your gun is solid (good sand bags are important for this project) and you're careful, looking through the scope you'll see the reticle moving the correct direction. If this method doesn't work for you, you can alway buy a kit.

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When using this method, you turn the scope adjustment knobs the OPPOSISTE of the usual markings. For example, if the bore is centered on bullseye and the scope reticle is high, you'll turn the adjustment for the reticle UP, not down. Don't ask me to explain

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It's because the turrets are marked in reference to the change in impact point, which is the opposite of the reticle movement

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It's because the turrets are marked in reference to the change in impact point, which is the opposite of the reticle movement

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That sounds right, but thinking about still makes my head spin.

You can do it that way with any rifle, even ones you can't open the breech on like a rem 7600.

Take a fired case, push the primer out, feed a string down the muzzle out the action, pass it through the case and primer pocket, tie a stopper knot, chamber the case.

Put the rifle in some kind of rest aimed at something 20 yards away, tie the string off to the thing (top of a T post works good). Adjust the rifle until the string is not touching the muzzle and taught to object. Adjust crosshairs to top of object. Done.