Originally Posted by WHITETAILFEVER
i don't know how true this is but i heard if you site your gun in at 25yrds it will be dead on at 100yrds?does anybody know if this is true?
You should fire a slug gun at 50 yards to set your windage as a slug is very susceptible to wind drift (just a 10 MPH wind can push the slug 6" at 100 yards). Here is a way to shorten the amount of ammo to sight in a firearm. Shoot two shots (to make sure you have a good grouping) from a bench using a rest. Now replace the rest with a gun vise (DO NOT SHOOT FROM THE GUN VISE).
Lock the shotgun in the vice so the cross hairs of the scope (or iron sights) are perfectly centered on the bullseye. Now adjust the scope or iron sights (without moving the gun or gun vise) so they are centered in the point of impact on the target. Replace the gun vise with the gun rest and test fire one or two rounds.
If it is close, you can then put the shotgun back in the vice to set the elevation. If you know how high you want the shot to be at 50 yards you can now set the elevation. Now, replace the gun vise with the gun rest and try your long distance shot (100 or 125 yards, etc.)
Make any fine tune adjustments on the elevation and then shoot at 50 yards to recheck your windage.