@Craig6 may have more input on this if you want to ask him, he probably knows the distance more than me and he can answer the questions you have.
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Thanks. I am trying to sight in a scope at 200 yards and an offset red dot at 100 yards.
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Oh boy, @Craig6 , donāt I know!
A little over a year ago, I tried Rimfire Benchrest as a way to lighten the burden on my bank account and I think it may actually be worse than centerfire. 
Saving $$ on ammo? Donāt make me laugh.
On Monday, I bought a Remington 513T, mfd January 1941, 95% condition, no mods, original Redfield peeps, sling - the works. It wasnāt a āneedā. It was a āwant real badā! $400 lighter billfold. 
And then there is the new rest that I needed, and new bags, and a set of discs, andā¦ ooops, here comes the wife. Bye!
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Yes, sir.
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You are in for a world of different answers depending on your use-case and ammunition.
25yard zero (which is 25/300)
50 yard zero (which is 50/200)
36yard zero (i forget)
100yard zero (i forget)
My humble opinion, is do a 50-200 zero. You can do it in 50yards, but is best if you can confirm it at 200. That gives you the least vertical shift in POA/POI out to about 250-ish yards (IIRC). Meaning a target anywhere from point-blank to 250yards you are never more than (i think, would need to confirm) like 3" off
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@Harvey , the 50/200 was what I was going to recommend to @Kevin45 if he is sighting with 55 - 62 gr.
Great minds and all that stuff. 
IMHO though, 100 yds for a red dot may not be the best idea (I didnāt say bad idea). Red dots are primarily for quick target acquisition at relatively close range. Out at 100, that offset is going to create problems if that isnāt the distance used to zero it.
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@Harvey @Robert401 My local range has a 100yd, 50yd, and 25yd area. I was thinking that 100yds for the red dot might be too far and Iāll also need to find a 200yd range for the scope or use the method that @Craig6 used on @Johnnyq60 ās M&P. Thanks for the red dot suggestions. I am using 55gr ammo.
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Short answerā¦ Zero at 50yards. When you shoot at the 25yrd target youāll be a couple inches low. When you shoot at the 100yard target youāll be an inch (maybe 2?) high.
If you are able to find a 200yard range, you should confirm your 50yard zero hits POA/POI at 200yards (often it is close but not exact). But if you are using a red-dot at 200yards, your margin of error due to vision limits will likely far outweigh any small diffs in your zero being off (IMO).
This image from Truth about Guns show (approximate) trajectory (there is much variation based on bullet weight, construction, velocity). The red line is the 50/200 zero and youāll see that itās only a few inches hi/low from 0-250. Itās the most consistent (IMHO) for most āgeneral purpose useā for 5.56/.223. Others may have a specific use-case where they need a closer or farther zero point, and if you have a deer rifle or other long-range precision or a PCC the ābestā zero distance will be something else entirely.
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The most important thing I learned in 2020/2021 regarding firearms, is keep them as close as possible and in perfect working order and in condition one!
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That I do not have enough
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I learned last night that our rights are in danger now more than they ever have been with the certification of a fraudulent election for a radical socialist regime.
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@Kevin45 et all, the method I used to get a āzeroā on @Johnnyq60 's rifle was not a method to āZEROā the rifle without firing it but with enough practice and patients you can get bloody close to a zero at whatever your preferred range is. I want to say the window we were sighting in at was 58 yards and Iām fairly confident that @Johnnyq60 will be on paper out to 100 yds if he should choose. Of course I would recommend he get about 50 rounds through the tube before he touches the sights. With a new barrel of unknown origin I would be happy if the first 5 rounds were anywhere near each other and would expect them to wander around a bit before they settled down to repeatable. Some barrels are obviously better than others but with mass production ARās that is the norm. For general fodder I like the 37 yard zero for short barreled (16" and in) ARās as it nets you center mass for 250 yards +/- depending on ammo and the exact configuration. This is about the max effective accuracy most can do standing on their hind legs.
Cheers,
Craig6
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Bore sighting is something I learned early onā¦ itās a very important starting point. Glad you found itā¦ saves on ammo thatās for sure. And it gives me peace of mind that Iām not overshooting the burm and killing someoneās cow a mile down the roadā¦
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That high capacity 30 caliber clipazines are as heavy as 10 moving boxes.
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You might not have understood the concept, but surely you heard the term " boresight". This is how you boresight a rifle.
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@Charles129 ,Yes sir that was another term I learned, bore sighting, and I did understand the concept.
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Range safety : When in āthe rangeā, always keep firearm pointed forward down range, even when laying it down flat in front of you, on the rest bench table unloaded (not laying pointed towards the person next to you)
Range safety : Never shoot someone elseās target next to yours, as the bullet can and has ricocheted and hit a person (as told to me by one of my license instructors)
Legally dissecting a case : When a person is shot, in an alleged self-defense case, it might not always be easily cut and dry, but rather, every step of the way, oneās decisions and actions are to be dissected, such as one decision might be appropriate, but another decision or action within the āentireā event might not have been the right thing to do
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Yeah, a jury can get weeks to judge a decision you had seconds to make.
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I have learned theres a greater demand than I could have ever forsaw
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