buckeyeLCPL

What exactly do you want to know about an ACOG? I'm no expert, but there is one sitting on my issued A4, and its pretty handy to have there.

They come zeroed at 100 meters and the drop compensator is built into the reticle. Last time we zero'd ours I believe it was at 100 meters as well.

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Paladin132

Buckeye - that's basically what I wanted to know. Although I am sure the Army does it their way I have always been impressed with the USMC and their rifle training.

buckeyeLCPL

Yeah, I guess we do a decent job at it. First time I shot at 500 meters, ever, I got black, that was a satisfying feeling with iron sights.

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cvhoss

The type of sighting system is generally irrelevant. Be it iron sights, 0 magnification red dot or fixed/variable power scope, the rationale is the same. A bullet, prior to reaching the apex of it's trajectory, crosses the line of sight twice. Once as it rises to meet the line of sight of the sighting system and once again as it drops to hit the target distance. The single biggest reason (at least as I've always believed) to sight in at a shorter yardage is that it is easier to "get on the paper" at 25 yards than 100 yards. Without the use of some type of bore-sighting system, it is entirely possible to be completely off the target at 100 yards. Unless you are shooting with a backstop immediately behind your target, it may be impossible to detect where your bullet is going thus wasting many rounds of ammo just to get on the target. By moving the target in to 25 (or whatever shorter distance), your odds of being on the paper with a newly mounted scope are greatly enhanced. Now, with a laser bore-sighter, I rarely use the 25 yard system anymore. I bore-sight and go directly to 100 yards for refinement. The reason I prefer to sight at 100 (instead of 200, 300, etc.) is that unless you have access to an indoor tunnel range, distances in excess of 100 yards bring wind more into the equation and it's almost impossible to find a windless day in Kansas. By sighing at 100 yards, I can reduce the effect of the wind to a point that allows me to get a better perfect zero and then make actual shot placement adjustments at the time of the critical shot. Hope this makes some sense to you. It seems to make sense as I'm typing it, but I'm not sure I'm conveying my intent as effectively as it could be.

Hoss

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sgtD

Here is an informative and quite well done article on the subject that covers several popular calibers.

zero

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