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Author Topic: Mil dot variations—my experience.  (Read 450 times)

Alan

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Mil dot variations—my experience.
« on: May 09, 2017, 06:42:48 AM »
First, a few given facts. We all agree a mil dot “distance” equals 3.6 inches at 100 yards. And, we’ll assume the scope(s) in question are variable power, and their mil dot reticles are mounted at the second focal plane (SFP). This means, at some given (advertised) power setting, the mil dots meet the criteria of 3.6 inches at 100 yards. But, this begs the question, are the mil dots correctly spaced at the advertised power level?

One of the ways to check this, is to use a ruler mounted at some specific distance, say 100 yards, or perhaps 50 yards. As point of comparison, I have a Leupold, 4.5x14x50, VX-3i with a first focal plane (FFP) reticle, mounted on my 40-XBBR. It is clear enough to see the hash marks on a ruler at 100 yards. It is not close to 3.6 inches between mil dots, it is dead on!

I have this thing about buying a scope which costs more than the gun it is on. So, on the various airguns I own, I have one Leupold 1.5x4, one Bushnell 6x24, one Stoeger 4x16, two UTG (Leapers) 4x16, and one ATN, X-Sight II 5x20. All of these are second focal plane (SFP), except the ATN which defies description with respect to focal plane position.

I’ll discount the Leupold because it doesn’t have a mil dot reticle. But none of the others have the correct mil dot spacing at the advertised power setting. Close perhaps, but no cigar. A good example are the two UTG scopes. One is the long version, the other the short version, both supposedly correct at 10x. However, the long version is correct at about 11 power, the shorter version at about 9 power. The Bushnell is closer at 12x. The Stoeger isn’t clear enough to view the ruler at 100 yards, but appears close at 50 yards at 12x.

Most of you know, the ATN X-Sight II is an electronic scope. Although it has a mil dot reticle as one of the choices, to say it is accurately spaced is insane! In order to see the ruler’s markings clearly, the distance can’t be more than about 20 yards. As a result, its reticle accuracy isn’t definable. In fact, calling it a scope is a bit of a misnomer.

The subject at hand (mil dot spacing) is perhaps moot when the average distance shot (airgun) is under 100 yards. But we’re on the dawn of larger-caliber, flatter-shooting, PCP airguns, capable of one inch groups  (or better) at 150 yards. Therefore, mil dot spacing is becoming more critical. It also points out the need for better-quality scopes, and ones with FFP reticles. They’re on my list at least!

While not on subject, clarity is one variable attribute almost directly-related to the price you pay. The aforementioned $100 Stoeger is a good example. No matter how the objective and eye-piece focuses are set, the scope can not be made clear, and color aberration is glaringly evident. The Bushnell was also about $100, but its clarity is still very good, even at its highest power, with little apparent color aberration. I’d rate the UTGs at average, and the ATN poor at best. But, as I alluded to above, the Leupold VX-3i is as clear and bright as $1,500 can buy. But on an airgun?

Alan

I want to add one more thing here. Most scope turret adjustments are either 1/8 inch per click or 1/4 inch per click. However, that doesn't mean they're linear in function and/or repeatable. In fact, most asian imports fail in both categories.
« Last Edit: May 09, 2017, 11:18:41 AM by Alan »


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Alan

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Martin

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Re: Mil dot variations—my experience.
« Reply #1 on: May 09, 2017, 08:13:21 PM »
A scope that won't walk a square should be on craigslist, not on your rifle.
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Alan

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Re: Mil dot variations—my experience.
« Reply #2 on: May 10, 2017, 05:51:26 AM »
Thankfully it is not!
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Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

Nvreloader

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Re: Mil dot variations—my experience.
« Reply #3 on: June 20, 2017, 10:47:20 AM »
Alan

Question for you,
Which Mil Dot version are you referring too?

There is the Army and USMC dots, plus others and the size of the dots are NOT the same.
See info here,
https://primalrights.com/articles/rifle-sighting-systems-part-2-angular-mil

Food for thought.

Tia,
Don
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It is time to restore the American precept, that each individual is accountable for their actions"
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Alan

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Re: Mil dot variations—my experience.
« Reply #4 on: June 20, 2017, 11:48:58 AM »
Yes it is, but the problem isn't the term Mil Dot. It is which one (assuming more than one), and at 10 power are the correctly spaced? They don't tell you anything more.

Part of the equation is most of the manufacturers are located in China. But the truth is, some of their scopes are really good, and often surpass some of the Japanese scopes we seemingly rave about. Others? Not so good. I do have a Hammers 8x32x52, that is pretty darn good, except for the glint off the built in level at certain low sun angles.

In any case, Im going to mount the Hammer's atop the .25 Cobra which should be here in a week or so. Then I'll put a bit more time into the "guessing" game.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.