If any of you use a site light of sort for beginning your initial sighting in, or to check a scope after transport, which type or brand do you prefer? A barrel light, or a chambered light? Or particular brands. Thanks allot.
I believe you’re referring to a laser bore sight here.
I have a Bushnell model. It works great for getting your scope set up and “on paper” before I start to sight in. Saves time and ammo for sure. IME it gets most rifles on a standard sheet of paper at 50 yards, so you’re fine-tuning right away.
It is also very handy for diagnostics if a scope setup is giving you trouble. I had a varmint rifle fall off a tripod in SD and I bent some part very badly because the rifle was shooting 2 feet or more to the left. Having the bore sight greatly enhanced my ability to test “in shop” and figure out what parts were really bent. Turned out to be the base, but it would have taken much longer to figure out had I not had the boresight.
IMO they are not precise enough to check your zero after transport. Every time you install the bore sight, you do it slightly differently and that will impact your “zero”. Also, unless your rifle took a huge hit the bore sights are not precise enough to detect a small shift that would only impact your zero past 100 yards.
Your 100 yard point of aim is generally not known because it is difficult to see the laser dot that far away. You will generally use the laser sight at a distance of 30 feet and most of the sights I’ve used have a formula based on ring height, so for example you’ll want the crosshairs to be 2 inches above the dot at 30 feet to roughly equal POI at 100 yards. Give or take some. I suppose you could zero your rifle and then redo the bore sight test at 30 feet and measure your distance from the crosshairs to the dot, but that would be a lot of faffing around.
BTW, in order to get the most out of a boresight, it also helps to have a crosshair leveling tool. If your crosshairs start out level, then the boresight will get you on paper and usually you’ll be either high or low, but essentially “on” as far as left to right with only minor tweaking usually required.
Grouse
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