Another option would have been to ignore his posts. You don't need me to tell you this.

My becoming annoyed was changing the focus of my comments from responding to the topic starter’s questions and thereby contributing to the discussion, to focusing on my annoyance. That’s what I meant by my comments taking me in an undesired direction.

I could have ignored his posts and that’s what I should have done from the beginning rather than responding to them at all. At first I didn’t envision where that part of the discussion would go, and especially not how bozman would respond to me, though, and when I recognized the fact, I chose to delete my posts rather than leave them as clutter.

Ballistics and a 36, 25 or 50 yard zero are all interesting for an initial point of aim but when concerned with armed urban disorder the center mass hits under 25 meters will be as prevalent as the importance of maintaining stealth and cover. Night vision, flash eliminators, low smoke rounds and a can are also far more important than planning for precision hits that will never be part of your survival.
Giving up your cover to take a hundred yard shot would probably be silly.

Woah... hold up.

The question was asked about zeroing distance. I offered an answer and was asked to explain.

I thought I did that in a matter of fact way and in no way belligerent or disrespectful.

I thought we were here to exchange ideas... Not to have 1 keyboard warrior attack/disrespect another.

I am sorry, but being a Seal that has been there and done that has more credibility than someone who is engaged in theoretical speak on an internet forum.

I will not blindly follow the 36-yard advice. I will try it out. Confirm it will do what I want in the way I think I may use my rifle. If it turns out to be bunk, then I will admit to it.

Sorry EasyFire for messing up your thread. I was trying to contribute with respect to your AR.

Respectfully...

PS - Fritz... Thanks. I will give that chrono a look.

quote:

Originally posted by Zero1911:
Zero whatever ya got at whatever yardage ya choose.

quote:

Originally posted by Zero1911:
Ballistics and a 36, 25 or 50 yard zero are all interesting for an initial point of aim but when concerned with armed urban disorder the center mass hits under 25 meters will be as prevalent as the importance of maintaining stealth and cover.

Giving up your cover to take a hundred yard shot would probably be silly.

Just because your AR is zeroed at 100 yards doesn't mean you're only/mostly planning to take 100 yard shots. Similarly, just because you plan on mostly making shots at under 25 yards doesn't mean you should zero at under 25 yards.

At under 25 yards, all of the common zeroing distances (25/36/50/100) will impact at roughly the same point: ~2 inches low. This is due to the ~2.5 inch offset between the AR's barrel and its sight (iron or red dot) height. The big differences only come about past 25 yards.

And if you were to zero at a distance closer than 25 yards, you're basically eliminating your ability to get effective hits from anything but very short ranges if needed, since your POI will be many inches or even several feet high at 50 yards and longer.

For example, if you were to zero at 10 yards, your rounds would be dead-on at 10 yards, but roughly 8 inches high at 50 yards, 18 inches high at 100 yards, 26 inches high at 150 yards, and 33 inches high at 200 yards.

Same with a 15 yard zero, which would be roughly 6 inches high at 50 yards, 13 inches high at 100 yards, 20 inches high at 150 yards, and 25 inches high at 200 yards.

Whereas something like a 50 yard zero is about 2 inches low at 10/15 yards, but is only around 2 inches high at 100 and 150 yards, and about a half inch high at 200 yards. And a 100 yard zero is about 2 inches low at 10/15 yards, an inch low at 50 yards, dead on at 100 yards, about a half inch low at 150 yards, and about 2 inches low at 200 yards.

So a 50 or 100 zero is just as usable at 10/15 yards as a 10 or 15 yard zero, but with the added greater flexibility for use at medium or longer ranges if needed too.

quote:

Originally posted by bozman:

Edited to add... I am in need of a chrono. Do any of you have any recommendations for something good that would be considered a "value" setup?

You can use a chrono, or you can use the truing function in strelok pro. Get a rock solid zero at an observed distance.

Shoot at a farther distance, either using the stadia holds in your reticle, or dialing if your scope is repeatable.

Compare the observed drop vs. the expected drop. Punch those numbers into Strelok and it will give you your actual BC and/or muzzle velocity. (You can alter either the BS or the MV, I alter MV.)

quote:

Originally posted by IndianaBoy:
[Y]ou can use the truing function in strelok pro.

Does that calculator require a minimum distance for the truing?
As I’ve been able to figure them out, the ones I’m familiar with require determining the drop at something like 600 yards or more.

quote:

Originally posted by sigfreund:

quote:

Originally posted by IndianaBoy:
[Y]ou can use the truing function in strelok pro.

Does that calculator require a minimum distance for the truing?
As I’ve been able to figure them out, the ones I’m familiar with require determining the drop at something like 600 yards or more.

It doesn't require it, but it will be more accurate if you use data from longer distances.

Okay, thanks. The longer distance thing of course makes sense.