Posted: 10/14/2010 9:16:20 AM EDT
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Who does it around the beaver dam area. Need a new reddot on a 20ga slug gun boresighted so I don't have to blow $20 in slugs Posted Via AR15.Com Mobile |
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If it is a break action you can DIY easily.
If it is a semi or pump, you can still do it yourself with a gun vise, dental mirror and an aiming point at a distance. It may not be a perfect method, but I bet you'd be on paper. If you have usable irons that are sighted in along with your red dot it may be even easier to align with help of a vise and distant aiming point. |
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Are you mounting it on the receiver or on a cantilevered barrel mount?
I do my own boresighting. In the case of a cantilevered barrel mount, no tools or "know-how" are needed, other than something to hold the barrel absolutely steady on a bench. It's simple.... just hang a target a reasonable distance away (I use about 20yds down my driveway) , look down the barrel and align it so the bullseye of the target is dead center in your view looking through the barrel, then without allowing it move, coincide your red-dot to the bullseye. This will get you on the paper, which is all any boresighting will do. If you're mounting the red-dot to the receiver, then you'll need a small mirror to stick into the open action of the receiver to look through the barrel... the rest of the procedure is the same. I made a boresighting "device" for a 12ga turkey gun. I took a cheap laser pointer ($5 at Family Dollar), measured the diameter, then drilled a hole that size through an empty 12 ga shotshell. I then turned the laser on, put it in the drilled out shotshell, which I then put in the chamber of my 870. The laser beam projected perfectly down the barrel, and I aligned the red-dot with where the laser beam was shining on my barn's wall. Test firing showed it was dead on... no adjustments were needed. 
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Quoted:
Its an 870 pump with canalever mount so no iron sights and I'm in my new house and haven't built a work bench yet so no vise. I'm hoping I can get it done this week so I can hunt this weekend. For tzone Posted Via AR15.Com Mobile No matter how you get it bore-sighted, you still have to "fine tune" it by actual firing. You can do the bore-sighting yourself at whatever shooting range you'll be using to do the actual sighting in. I assume you'll have some kind of shooting rest or sandbags or something to rest it on while test firing. The sole intent of boresighting is to have your 1st "sighting-in" shot on the paper at 25yds. |