FAQs
What the HELL does this thing do?
Put simply: The D-Vise squeezes the end of the barrel. The barrel squeezes the projectile as it leaves. The extra squeeze provides better guidance. Better guidance = better accuracy downrange.
Better Accuracy you say? How much Better?
This is pretty loaded question, but it is usually substantial. Honestly, the correct answer is that “it depends” on a bunch of variables. Here are a couple of examples: inexpensive deer rifles with factory ammo tend to improve the most with group reductions around 30-70%. If you start with a better rifle and high quality reloads, improvements tend be more mild, around 15%-50%. This is based on our extensive testing. YMMV.
How will I know its working?
Check out our Test Firing Challenge page. We have printable targets and resources to do truly statistically significant testing on your rifle. You can use this to prove the D-Vise is performing with a Before/After test or you are welcome to use the resources to help with your own skill development. No purchase necessary!
My rifle already shoots good groups. Why would I need this?
If your rifle is seriously shooting tiny little groups in the same spot time after time, then you don’t need the D-Vise. There’s basically no room left for improvement.
But, that’s simply not the case for the vast majority of people and it’s very likely your rifle doesn’t shoot as well as you think it does. Don’t believe us? Ok. We get it. So, don’t take our word for it. See what Outdoor Life and Hornady have to say about it.
Here’s the Outdoor Life article:
https://www.outdoorlife.com/guns/how-to-zero-a-rifle/
Here’s the Hornady podcast on YouTube:
https://www.youtube.com/watch?v=QwumAGRmz2I
To really understand precision and accuracy requires a fairly high level of statistics knowledge. Simply put, and contrary to popular belief, firing 3-5 shots and measuring the extreme spread means almost nothing. And firing several groups and measuring the average group size is a factually incorrect measurement. Not only does it require at least 3 shots to get one data point, but it completely ignores how the groups move around on the page.
But, don’t worry. We’ve got you covered. Our engineering team includes statistics experts who have developed a simple system for you to test your rifle’s accuracy and compare the results with and without the D-Vise. All you need to do is shoot and enter some data from the target. All the math is done for you and the results are clearly presented.
If you’re wondering whether you need the D-Vise, go to our Target Challenge page and try out the first part of the test before you decide whether or not to buy. All you need is about 20 rounds of ammo
Wait a minute! You guys are claiming to be statistics experts but you just said all I need is about 20 rounds of ammo to test out the accuracy of my rifle?
Yes. And here are a few links that go into much more detail.
Outdoor Life: A Better Way to Zero and Sight in Your Rifle
Hornady’s podcast: Ep. 050 – Your Groups Are Too Small | SAMPLE SIZE |
Hornady’s podcast: Ep. 052 – Your Groups Are Still Too Small | A Follow Up |
Twenty rounds is a sufficient to get a good estimate of how well your rifle shoots. If you are testing before and after you install the D-Vise, then you would shoot 20 rounds before and 20 rounds after you install the D-Vise. Forty rounds total. Usually, this is sufficient to get a good estimate of the difference between how your rifle shoots before and after the D-Vise is installed.
Accuracy testing really doesn’t work the way most people think it does. Some people think 20 rounds is way too much. Others think it’s not nearly enough. The fact of the matter is that it depends on what you are trying to determine, how sure you want to be, and how the test is structured.
Whether you realize it or not, shooting just a few 3-5 shot groups and measuring the extreme spread of each groups is almost useless. Just doing it once or twice is completely useless. But, say you shoot five groups. That’s 15-25 rounds and you only got 5 data points. That’s not enough to have much statistical meaning. It’s both wasteful and ignores the location of the groups.
In contrast, our method overlays all the shots so every shot gives us a data point. It checks to see if the shots are dispersed in a normal statistical distribution, which they almost always are. With that being the case, then we can determine two very critical values: the center location of the shots and the mean radius. The center location tells you how to adjust your scope to get a true zero. The mean radius tells you all you need to know about your group sizes, including your average 3 or 5 shot group size.
In many cases, you can get a reasonable level of confidence in these results with as few as 10 rounds, which means you need 20 rounds if you are testing with and without the D-Vise. However, the confidence in the results will be much better if you test with 20 rounds with and without the D-Vise.
But, this is just a general guideline and it depends on the difference you expect to see. To detect a smaller difference with and without the D-Vise will require more rounds but a larger difference will require fewer. There is a section in the D-Vise instructions that provides detailed guidance on this.
Isn’t this thing just a tuner?
No. The way the D-Vise works is completely different from the tuner concept.
The D-Vise applies massive pressure to the end of the barrel until the bore diameter is reduced by about 1/1000th of an inch. This ensures the bullet is tightly guided as it leaves the barrel, which is the key to shooting small groups. Think of it like a choke tube, but for rifles instead of shotguns.
The concept of a tuner is that it alters barrel harmonics to match how your ammo shoots. It attempts to adjust the barrel oscillation so that the bullet exits at the top or bottom of an oscillation cycle when the barrel is momentarily motionless. There is much debate about whether or not tuners actually work or not and we will leave that up to you to decide.
However, a tuner has a large number of settings. To determine if one setting works better than another would require at least 10 rounds, and more likely 20+ rounds, to test each setting. You see the problem. It would be very costly and time consuming to correctly test a tuner.
One of the big advantages of the D-Vise is that it does not have any settings. You install it and you are done. Testing then only requires around 20 rounds before and 20 rounds after it is installed.
Do you really expect me to believe that you can squeeze the end of my barrel and shrink the bore by 1/1000th of an inch? That’s frickin’ impossible!
It’s totally possible and is well-established science in mechanical engineering. The math behind it is almost 200 years old and it’s done all the time in all kinds of industries.
Gabriel Lamé published the equations for the elastic stress in a thick-walled cylinder in his 1852 book, Leçons sur la théorie mathématique de l’élasticité des corps solides. “Lamé’s equations” provide a way to calculate the stresses and strains in a pressurized thick-walled cylinder.
What if it doesn’t improve my rifle?
Contact us! We will make it right! We can help with installation issues and a few other pointers. If we can’t get you set up we will issue a refund. No BS.
Will this “doohicky” damage my favorite boomstick?
Absolutely not. We have tested this on our own boomsticks to ensure the D-Vise is removable without damage to the barrel steel or the finish. If you choose to remove the D-Vise, your rifle will look and function just like it did before you installed it.
Is this “doohicky” a suppressor?
NO! This product does NOT create any measurable decrease in the sound levels of the base rifle.
I’ve never heard of you and your website sucks. Are you legit?
Well, we are a startup and this is a brand new technology so it’s not surprising you haven’t heard of us, but we are definitely legit. That means we are busting our humps to make this work for everyone… our customers, ourselves and our very patient, wonderful spouses!
Our products are solid. They have been extensively tested. They work well. And we stand behind them. When you order, we will do our best to ensure it is delivered to you as quickly as possible. If you have any trouble installing it, we will be glad to get on the phone and give you the help you need. And, also very importantly, we are using proper user account and payment systems to ensure your personal information and payment information are secure.
And, of course the website sucks, we’re ballistics nerds, not web designers. And, we let the machinist make it….