There are 4 issues developing in this thread that need to be addressed.

1. Sight height is a vital piece of information and you can't accurately determine a 25m POI with a 100m zero without it.

2. Your specified range numbers don't make sense if the range is in meters. They do line up fairly accurately with the trajectory for that round at an MV of 2820 fps with a 1.9" sight height. To get those numbers at the 9% longer range in meters, you'd need significantly more velocity and that's not going to happen in a 20" barrel where the velocity will be a bit less. Depending on the load, the difference can be as little as 25 fps or as much as 150 fps with a 20" .308.

3. You can't take the drop at 100m that you get with a 25m zero, come up that amount in inches at 25m and expect to have a 100m zero. I calculate 3.3" of drop at 100m (3 MOA) with a 25m zero and a 1.9" sight height using the OP's load and MV. If I were to come up 3.3" at 25m, I'd be zeroed at about 500m.

I can however come up 3 *MOA* at 25m and get an approximate 100m zero. An angle of 3 MOA subtends a linear distance of .856" at 25m which (surprise, surprise) is how high you'd need to be impacting the target at 25m to be approximately zeroed at 100m.

4. Using a 25m target to create a 100m zero will at best only get you in the ball park. A difference of 1/10" at 25m will make a big difference at 100m. Similarly, 1/4 MOA adjustments at 100m will equal .285", but at 25m, that same 1/4 MOA click will result in a change of just .071". Consequently, a minor variation in bullet impact, or a minor error in determining the center of the impacts can leave you a couple clicks off in both elevation and windage. Then, if you plan to use that basic 100m zero to add elevation and windage on the scope, you will be magnifying that error significantly as the range increases.

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Consequently, if you are thinking that you can use published load data and a 25m range to develop an accurate 100m zero and then go hunting at ranges in excess of 100m, you are not a road to either success or responsible hunting.

You need to find a 100 yard or meter range and develop a proper zero for your rifle, particularly if you plan to add dope on the scope for shooting at longer ranges.

Ideally, you'd also have actual chrongroph data for your load in your rifle, and/or true the predicted ballistics with actual results on target at long range.

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One final thought. If you were raised using imperial units (GA address) and are comfortable estimating range in yards and target size and hold over distances in inches, feel free to just use yards and inches. There's no need to use meters just because it's common with military trained shooters, and there is no advantage to mixing imperial and metric units - it just makes the math harder.