.280 Ballistics-sighting in question

My sons are coming home from college so I need several rifles sighted in a ready to go soon. This afternoon I was sighting in my .280 at Surplus City after mounting a Leupold 6x42. Using 150 grain corelokts I have the rifle shooting 2 inches high at 50 yards. The scopes adjustments are in 2 moa increments. If my windage is just right and shooting a little high at 50 yards. Where will I be at 100 yards? Rifle has a 22" pacnor barrel. didnt have access to chronograph and was in a hurry. Hoping to stretch out at Magnolia one morning this week and see where things are at 100, 200, and 300.

Either way I think I am minute of whitetail at 100 yards over a food plot.

rdinak wrote:My sons are coming home from college so I need several rifles sighted in a ready to go soon. This afternoon I was sighting in my .280 at Surplus City after mounting a Leupold 6x42. Using 150 grain corelokts I have the rifle shooting 2 inches high at 50 yards. The scopes adjustments are in 2 moa increments. If my windage is just right and shooting a little high at 50 yards. Where will I be at 100 yards? Rifle has a 22" pacnor barrel. didnt have access to chronograph and was in a hurry. Hoping to stretch out at Magnolia one morning this week and see where things are at 100, 200, and 300.

Either way I think I am minute of whitetail at 100 yards over a food plot.

According to an online calculator I use often (and it seems to work as a good starting point), at a MV of 2700-2900 (estimate) if you are 2" high at 50 you should be 4.2 to 4.6 inches at 100, approx. 5.4 inches at 200, and zeroed at 300.

maybe its just me but i like my rifles dead on at 100 yds, ifshooting at 300 yards i just aim high on the shoulder, im sure the way your sighted in will work fine the 280 is a great round, often overlooked if i were to build a custom rifle today it would be a 280 rem.

I would think it should actualy need to be a little low at 50 yards.

J.B.

How high is "a little high"? Using Remington Shoot software and calculating for the load you specified, 1.33" high at 50 will put you dead on at 250 yards. For a 100 yard zero, you should be 0.18" low at 50 yards. As mentioned above, this is only ballpark estimates, as each rifle is different.

Dude

2 MOA adjustment increments on a scope ? U buy it at TOYSRUS ?

Seriously most hunting scopes are 1/4 moa....

1 moa is one inch at 100 yards

If you are on at 50...it will be close at 100 with a 280....You'll be minute of deer anyway

Of course inside Surplus City you are in a windless environment

Next time pm me and we'll do the whole thing at the redneck range just outside Clinton 100-300

Found an old thread on Calgun.net about the Mysterious 2MOA Adjustment Leupold Scopes. Older Leupolds like the Vari-X II had friction adjustment instead of the click like now. They are 1/2 MOA adjustments. Each hash mark is 1/2 MOA they just put numbers on the even ones. Short hashes are 1/2MOA, Long ones are 1MOA They used it on fixed and adjustable power scopes. Leupold will convert them to 1/4 MOA click adjustments.
Fixed power scope


Here's a picture of the adjustment on a 4x12

Appears to me, you are sigting in for MPBR. You are certainly going at in the right way. A cronograph is needed. It helps to know the muzzle velocity to find what the correct trajectory should be. I shoot a 25/06, and at 100 yards, it is 3 3/4 inches high. At 200, it is still about 3 1/2 inches high. MPBR is 285 yards. remember, this all starts with a 25 yard zero, dead on.

Got her stretched out to 200 this morning with the aid of a brilliant gentleman on the spotting scope. All is well ...and the whitetail herd will be thinned this fall.