A question re sighting in a scope.

[SunnySlopes]

I read a theory about sighting in a scope. This particular theory says to sight in the scope at 200 yards. If you have a shot at 100 yards, aim dead on. The bullet variance will only be about 1 inch. If you have a shot at 300 yards, aim dead on. The bullet drop will only be about 1 1/2 inches.

The idea being that in that scenario, regardless the range, the shot will still be in the kill zone for a deer or elk sized animal.

Does this have any validity?

 

[CountGlockulla]

http://www.rmvh.com/MPBR.htm

It depends on a number of factors. Article has a good explanation.

 

[rcmodel]

Does this have any validity?

Yes.

Maximum Point Blank Range is the way I have sighted in rifles for 50 years.

For most typical calibers, 1 1/2" high at 100 yards will allow a dead center hold from 25 yards out to 250 yards.

Even more on flat shooting varmint rifles.

If you download the free Remington Shoot software, it will figure the MPBR sight-in at 100 or other range for most any centerfire caliber they sell ammo for.

http://www.remington.com/pages/news-and-resources/downloads/remington-shoot-software.aspx

rc

 

[MaterDei]

Very valid approach.

This is a good video

 

[Outlaw Man]

My dad is about to go antelope hunting and only has a duplex reticle. I've convinced him to use this approach rather than "guessing" how much he's holding over. He's good to about 250 yards with no holdover. That's about as far as he's comfortable shooting one, anyway.

 

[Coltdriver]

Actually what you say is fundamentally valid but can be badly wrong depending on the arc of the round you are shooting.

For example a 30 06 shooting a 180 grain round does not shoot that flat. you would have to be about 3 inches high at 100 to be 3 inches low at 200 and at 250 you would be 13 inches low. This is at 2500 fps and a Hornady round nose.

A .243 shooting an 85 grain round will work as you describe. I launched an 85 grain partition from a .243 AI at 3600 fps and could go right at 2 inches high at 100 and 2 inches low at 250 yards. Shooting into a four inch circle all the way out to 250 yards is pretty easy.

The key is to get on some ballistics software and, using the published speed of the factory round you are shooting, put in the parameters of your round and see what the arc is. Then you can establish the PBR for your rifle and round.