It may sound like a no-brainer that shooting with your eyes open will improve your accuracy. For me, it was not so cut and dry. I had always been taught that I should shoot with my dominant eye, my right eye, and close the other eye. Focusing in on the front site tip with only my dominant eye open while tightly squeezing the other eye closed. My groups were satisfactory for a new-to-handguns shooter. They were not, however, very impressive.
Last Monday, I had the pleasure of shooting with a man with a ton of tactical handgun experience. As I watched his form, I noticed that he appeared to be shooting with both eyes looking down the barrel of the handgun. When I asked him about it, he confirmed that in most cases, he does try to shoot with both eyes open. To be honest, the thought had never crossed my mind.
As I approached the target, I tried to focus on the front site tip with both eyes open, I found it at first impossible to get the front site tip to come into view. I had to close my left eye, get the front site in view and then slowly open my left eye. All at once, I had a very clear view of the front site tip. As I squeezed off the first round, I decided not to even look at the target and followed up with a second shot. When I came off of the site to look at the target, the grouping was a keyhole shot. Both shots through the same hole. I re-aligned my focus to the front site tip and put together another three shot group with all of the shots touching.
Just like that, in one fall swoop, I had cut my groups down from 3-4" to less than 1". Turns out, if you shoot with both eyes open - which is a challenge - you can significantly improve your group size.