What’s that old saying? A lie, told often enough, becomes truth?
We gun people are often guilty of a related thing. That would be passing along hearsay comments over and over, until they become assumed fact.
Some of the things that I’ve heard a thousand times relate to gun sights. You know, observations like “Big Dot sights are too big to be useful”or “they’re not precise enough!”I got a bug up my butt to put some of these handgun sight myths to the test so I could start to separate truth from hearsay.
Let’s take a look at a few of the more common handgun sight myths.
Big Sights Aren’t Precise Enough
To test this potential myth, I figured it was a good time for the first annual Shooting Illustrated Math Fair. In this inaugural event, we’re going to use really basic geometry to see exactly how big that Big Dot sight looks down range. In other words, at realistic handgun shooting distances, how much of your target is covered by the Big Dot sight?
Since this is supposed to be fun and informative, I won’t be a buzz kill and share the math in excruciating detail, but it’s pretty simple. We know that the shooter’s eye is the starting point. We also know that this particular Big Dot Sight is .18 inches in diameter because I measured it with my reloading calipers. We also know, that in my specific case, the front sight is about 24.5 inches from my eye when I'm shooting. Seriously, I measured with a yardstick. So now we have a proportional relationship. At a distance of 24.5 inches, the sight is .18-inch wide. As a result, we can easily figure out how big that sight appears at other distances.
Here’s how much the Big Dot covers at various ranges. Keep in mind that the Big Dot is a circle, so “coverage”of the target down range is also circular. The sizes I relate below reflect the diameter of that circle.
Point Blank (Touching the target): .18 inch
3 yards: .8 inch
5 yards: 1.3 inches
10 yards: 2.6 inches
15 yards: 4.0 inches
25 yards: 6.6 inches
50 yards: 13.2 inches
100 yards: 26.4 inches
Clearly, Big Dot sights aren’t intended for NRA Precision Pistol Matches. Rather, they’re made for self-defense handguns with the emphasis on speed, clarity, and "good enough" accuracy at self-defense ranges.
What’s the bottom line? When you look at the real numbers, that huge front sight doesn’t cover much of your target at all. At 25 yards, it’s just 6.6 inches, and that is a much farther distance than 99.9 percent of defensive shooting scenarios. If you can shoot into a 6.6-inch group from a distance of 25 yards while someone is shooting at you or charging with an ax, then please submit your application to be my permanent bodyguard! At more realistic self-defense distances like 3, 5 and 10 yards, we’re talking an inch or two of target coverage by that front sight. Even at a whopping 100 yards, if you can hold well enough, you can easily hit a standard 19-inch-wide self-defense target. Yes, your front sight will overlap it, but just a little. To me, this precision myth is exactly that—a myth.
Big Sights Aren’t Any Faster
The idea behind using a large front sight is that your eye can pick it up really quickly as you raise your gun to target. There’s no ambiguity or confusion about which dot is the visible area is the front or rear. In fact, XS Big Dot brand sights don’t even use rear dots. Rather, the rear sight is a shallow “V”shape, much like the rear sights on lever-action carbines from the Bonanza era. I don't know if Ben Cartwright gets royalty checks or not, but he should.
So, is this approach to handgun sights faster? I decided to find out by performing some semi-scientific testing. Since I’m writing this article during the great Charleston Monsoon of 2015, my shooting range has been unusable, being submerged in water. So I decided to get creative and put my LaserLyte Reaction Tyme targets to work along with a Beretta Px4 Storm, a LaserLyte Cartridge Laser, and a set of XS Big Dot Sights. My plan was to set up two Reaction Tyme Targets in my (relatively) dry living room and recruit a couple of people to shoot for time using the standard Beretta Px4 factory sights. Then, I would install the Big Dot sights and repeat the process, comparing before and after times. If nothing else, I figured this would be a great way to burn off some “four days of non-stop rain” stir crazy.
I recruited two shooters, neither of which had any experience with Big Dot Sights. I set up the two Reaction Tyme targets about four feet apart at a distance of 12 feet. The idea was to hit one and have to transition to the other quickly. My thinking was that would exercise the sight acquisition part of the experiment. Each shooter fired 10 shots alternating between targets. The “hit” area on the Reaction Tyme targets is only about a two-inch circle, so shooters had to aim, even at a distance of 12 feet. Only hits counted, so each shooter had to stay on a target until it registered a hit with an audible beep.
What were the results? Each shooter completed three timed runs and I averaged the results. Shooter A completed the course using standard sights with an average time of 12.6 seconds and Big Dots sights in 8.0 seconds. That’s a 36.6-percent speed improvement. Shooter B averaged 20.4 seconds with standard three-dot sights and 17.2 seconds using the Big Dot configuration. That’s a 15.2-percent improvement.
While not completely scientific, the results were pretty clear. Each shooter reported seeing the dot much faster and commented that there was not a need to “focus and line up.”They simply covered the target with the dot and pulled the trigger. The rear "V" sight just fell into place naturally.
Iron Sights Aren’t Accurate
People often refer to the inaccuracy of iron sights. That’s not exactly a true statement. Iron sights are plenty accurate. It’s our ability to line the sights up properly and consistently that is the issue. The accuracy capability of shooting with iron sights is really more about the limitations of our eyesight and our ability to hold those sights steady shot after shot.
Here’s what I mean. Like the precision scenario we discussed earlier, the accuracy potential of shooting iron sights boils down to a proportional relationship. In this case, we’re concerned about how much or little the front sight moves relative to the rear sight. If you put your handgun in a vise or perfectly mounted Ransom rest, your sights are going to be in the exact same position for every single shot. The minute you rely on human eyesight to line up those sights for the next shot, you’re limited by your vision.
A real example will help illustrate my point. Suppose I fire a shot at a 25-yard distant target using the same Beretta Px4. Now, I settle back into my sandbag rest to fire a second shot in the group. It’s up to me, the shooter, to make sure that the front sight, rear sight, and target are all in the exact same alignment as they were for the first shot. What happens if my front sight is just .01 inch out of perfect alignment relative to the rear sight? Let’s find out.
The sight radius of my Beretta Px4 is 5.77 inches. That’s measured from the rear of the rear sight to the rear of the front sight, or the parts that my eye actually sees. If my front sight drifts just .01 inch in any direction relative to the rear sight, that translates to 1.6 inches off target at 25 yards. If we were using a gun with a 2-inch sight radius, the error down range would be even larger. Considering that many modern production pistols care capable of shooting one to two-inch groups at 25 yards when in a Ransom Rest, that’s a big deal.
What does all this mean? When you read about “accuracy”of any given handgun, know that unless machines are involved, what you’re really getting is an indication of that pistol’s ability to be shot accurately. That may depend on the quality or type of sights, the sight radius and the overall ergonomics of the pistol. Viewed another way, a pistol with a 10-inch barrel may or may not be more accurate than one with a two-inch barrel, but it sure will be a heck of a lot easier to shoot accurately. If a human shoots those two guns from sandbags at 25-yard targets, they’ll almost certainly get better groups with the 10-inch gun. That's because it’s easier to aim precisely with its longer and more forgiving sight radius, but that doesn’t necessarily mean the gun is more accurate.
We shooters tend to pass around too much hearsay information and consider it truth. It never hurts to be a bit skeptical and think things through on your own or even test them if possible. Heck, your life may one day depend on it.