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on February 2, 2016
These are usually sold by common parent case, with that said, what says on the cartridge that ships may not be the caliber you use it for. The 308 is labeled 243 win (so that it can fit necked down and the parent case). This is not an error, and you didn't get the incorrect boresighter.
These are to get you ON PAPER. That is if you zero your scope, red dot, holographic site, RMR, etc. for the laser dot, where the bullet hits, isn't where the red laser is necessarily.
These are delicate. There is no need to load one of these in a PMAG and drop the bolt on them to load them. There's no need to close the bolt completely. I usually remove the BCG from an AR and just push these gently into the chamber and then shake the weapon to get them to fall out. The AR's floating firing pin can crack the screw cap (where the primer normally is).
The laser isn't that great. Bright sunlight can wash out the laser. They make laser reflective targets (tinfoil works too) for outdoor use.
TAKE OUT THE BATTERIES WHEN NOT IN USE.
You may have to compromise and use these at 50 yards to get on paper, then adjust accordingly at 100 and beyond--since they may not show up at 100 yards (they make targets with offset zeros at 25 and 50 yards for 100 and beyond if you can't figure it out from a ballistic chart or are using handloads).