Originally Posted by katoguy
So I'm new here and love what I've read so far. So here's something that's been rolling around my head... I have a 30.06 and primarily shoot 150 grain rounds I picked up some 165 grain rounds that were on clearance the other day and shot them. I had to move up 12 clicks to be on in elevation at 100 yards. The question is two parts: 1.) should I be on at 200, 300 if I am at the same elevation at 100 yards with the 165's as I am with the 150's assuming they drop at the same rate? 2.) If I were to buy 180's would there be any way to know how to adjust w/o shooting ie. has someone done this who can tell me approx. how much lower a 180 grain bullet will strike at 200 yards then a 150 grain? Thanks for the comments. Don't rip me too bad, I'm new.
Every time you change bullet types and/or weights and every time you change brands of ammo you will need to re-zero your.
Why you may ask? Different bullet types and weights have different Ballistic Coefficients.
What is Ballistic Coefficient? Ballistic Coefficient is the ratio of a bulletís sectional density to its coefficient of form. The term is used to describe the bulletís effectiveness in over air resistance during flight. I other words the more pointed the bullet the easier it is to over come air resistance during flight.
Therefore you need to re-zero your rifle and also shoot it at 200 and 300 yards.
We donít know in most cases what powder or the BCís of the bullets that the ammo companiesí are using.
The Ammo Companies will give you a Ballistics Chart for their Ammo or you can go to their websites and look it up. These charts may or may not be useful.
Why? Every rifle is different and a law unto its self.
Every time you change bullet types and/or weights and every time you change brands of ammo you will to re-zero your and also shoot at 200 and 300 yards to see where it is hitting.
The Olí Man said, ďSon, donít brag to me about the long shot you made! Brag to me about how close you got!Ē