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I am looking at ballistics charts. It would seem if I were sighted in at 100, I need to aim 3.5in high, according to this chart. I added in all the info based on what I know. This sound about right? I have noticed most of the pre made charts are designed for 200yd sight in. Any thoughts on this as well
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200 yards is generally a good hunting zero.
For a .308 150 gr SGK at 2800 FPS, with a 200 yard zero you will be just under 2 inches high at 100, and about 8 1/2 inches low at 300, so depending on where your target is, you hold appropriately.
The other alternative is using a ballistics program to calculate a Maximum Point Blank Range. With MPBR, you determine a vital zone radius, and the calculator will give you a zero that the bullet will always be within that radius.
For example, using that same .308 150 gr Sierra Gameking @ 2800 FPS and a 4 inch vital zone radius, your Maximum PBR is 308 yds, and your Maximum PBR Zero is 263 yd.
So with your rifle zeroed at 263 yards, if the target is anywhere between arms length and 308 yards, you hold dead on.
That is the idea anyway.