sighting in a rifle

[gharsh]

I have a Ruger 10/22 that I had sighted in at about 70 yards a couple of years ago. I have not shot it in over a year. I only have easy access to a range that goes to 50 yards. Is there a way to check if it is still locked in at 70 yards when shooting at 50 yards. For example, should it be hitting an inch high, low; half an inch, etc.

Any help would be appreciated.

Thanks.

 

[Carlos Cabeza]

If your rifle is sighted to POA @ 70 yds. then POI should be unchanged @ 50 yds. Maybe a bit high ?

 

[TallPine]

Drop between 50 and 100 yds is about 6 inches.

But that won't be linear - drop will increase rapidly with the distance from the muzzle.

So an inch high + at 50 yds sounds about right to me.

 

[OH25shooter]

Is your 10/22 a target (hole pucher) rifle or varmint killer? Before I got rid of mine (used for varmints) it was zero'd at 75 yards. She was accurate to that distance and from 76 yards on...terrible.

 

[gharsh]

I had used it to punch paper out to 100 yards and was quite pleased with it. It is the stock receiver, but I put a heavy barrel, scope and synthetic stock. Great gun. A little heavy now though. Not much more than the 12 guage.

I am going to use it to knock off squirrels and had thought about just setting up somewhere and picking them off from distance. Anyhow, I was going to take out the rifle and shoot it some to see if it was still hitting where it used to and I was wondering if there was some mathematical formula to use to adjust for distance when only shooting at 50 yards.

Thanks for the suggestion of an inch high, TallPine. I hope to get to shoot some cans or something at 100 yards once out in the field to check the scope.

 

[lycanthrope]

If you know your bullet speed and scope heigth you can figure out the ballistic curve using many free software programs such as:

PC-Ballistics. PM me for the link since I'm currently at an off site computer.

In the meantime, try this for an idea:

http://ipgeneral.com/~renegade/rifle/rifle1.shtml

I know my 7stw needs to be zeroed 8.33 inches high at 100 yards to strike dead on at 500 yards.