Fire about 5 rounds at a decent pace at 20' and make one hole. I've only seen maybe 1 in 50 at best that can do that no matter what gun they have. I'm not a machine but 25 yards is not a problem. Not one hole any more though so less fun for me. Some kind of controlled test vs. you all just "think" it did something would be more useful information. Nope. It means the guns are much more accurate than most here realize otherwise they'd waste less money on gimmicks and spend it on training to get them past their shooting issues. If you THINK it helped you I am glad for you. I don't agree with the theory of it. I feel the theory is flawed. I don't agree that it has been proven in practice. If I had some miracle device that would magically improve the accuracy I would have tests that proved it. I can still remember when aftermarket guide rods first came out for the Glock and people were convince they made dramatic differences in accuracy. I think you are CONVINCED it is helping you.