sighting in

[codfish]

I am going to sight in my rifles and was wondering if anyone could tell me how high from the bulls eye would I have to hit to sight in for 200 yards,The range is 75 yards and I will be shooting 30-06 and 307 both 180 grn shells

[Hawks Feather]

Codfish,

First off, this will be ballpark, since I don't know for sure the bullet tip, etc. but this will help.  Sierra reloading manual shows 30-06 at 2500 and 2600 feet per second with 180 grain bullets.  At 2600 you will be 1.5 inches low at the muzzle, 1.1 inches high at 50 yards, 2.3 inches high at 100 yards, and on at 200 yards.

Is the .307 by chance a .308?  If it is and the feet per second are 2400 feet per second (average load) then you will be 1.5 inches low at the muzzle, 1.5 inches high at 50 yards, 2.85 inches high at 100 yards, and on at 200 yards.

Again, this will get you in the ballpark, and is not exact.

Jerry

[FinsnFur]

Ditto, to Jerry's post. 

But if it was me, and the local range was only 75 yards, I'd shoot twice. 75 and 75 is 150 and that'll get you pretty close. 

No seriously, if it were me I'd go somewhere else, maybe and old hunting spot and pace off 200yds where I knew I could shoot safely.

[weedwalker]

But if it was me, and the local range was only 75 yards, I'd shoot twice. 75 and 75 is 150 and that'll get you pretty close. 

After the 2nd 75 yd shot, bump the scope up 3 more clicks to adjust for the last 50 yds.  :roflmao:

[vvarmitr]

  We gotta get some new help around here! 

[HaMeR]

I would zero it at 75yds & here's why. Check the short range trajectory on this link.

Or you could just go +3" at 75yds per the long range on this chart.

JMHO & HTH


http://www.remington.com/products/ammunition/ballistics/comparative_ballistics_results.aspx?data=R30064*R308W2

[FinsnFur]

HaMer just ruined it 

[HaMeR]

Sorry!!










NOT!!!!!!!!!!!!!!!!!!!!!


:roflmao: :roflmao:

[JohnMeador609]

Wouldn't ring height have a role in this also.  I would zero at 75 at your range then as said mark off 200 at your hunting spot crack off a few rounds just to make sure.

[Hawks Feather]

John,

Welcome to Fins and Fur, glad to see you posting.

You are correct that ring height will have an influence on the sighting in.  In my reply the 1.5 inches at the muzzle is the height of the scope above the center of the bore.  Hopefully the information provided by several of us will be used to "get on paper" and will not be used as the final sighting in for hunting.  Using a chronograph will greatly improve the ability to predict where the round will be at 200 yards and without it, it is just a guess as to how fast a bullet is going from each gun.  With my .223s I have had almost 1500 feet per second difference between guns with the same loads. One is a carbine while the other is a little longer barrel.  That is over an extra quarter inch drop at 200 yards with a 50 grain bullet and more with the heavier, slower, 180 grain bullets.

Jerry

[JohnMeador609]

Thanks for the welcome

The reason I brought this up is because I have to use extra high rings to get the cheek weld I like. This causes weird things at short vs. long trajectory.  So I wouldn't trust sighting in X amount high at X yardage and expect it dead nuts on at X distance the only way to know is shoot your gun and load and various distance's and see for yourself.

[RShaw]

Hawk,  Same load, different gun with 1500 feet per second difference? Something aint right there.

Randy

[Hawks Feather]

That was what I thought till I ran both of them through the chronograph on the same day.  One is a T/C contender with a Mag-Na-Port muzzle brake and the other is a Remington 700 that was rebarreled with a tight necked barrel.  Seemed extreme to me.  On most of my .223s there won't be over a couple of hundred fps difference.

Hawk

[RShaw]

Yep...that is about what  I see. couple hundered feet per second difference.

Randy