Height Over Bore Meaning. The HOB here is determined from the ACOG 3. 8″ above the
The HOB here is determined from the ACOG 3. 8″ above the center of the bore Height Over Bore Explained and Why an Elevated Red Dot Is Better Free Range American 88. When the gun is fired, the bullet motion and the escaping propellant gases exert a reactional recoil directly backwards This glossary of nautical terms is an alphabetical listing of terms and expressions connected with ships, shipping, seamanship and navigation on water (mostly though not necessarily on the sea). Mar 8, 2018 · I have a few techniques for measuring scope height for use in a range finder/ballistic calculator. With this setup, you have consistency between the iron sights and the red dot, which means the height over bore is the same between the two for consistent aiming. Set your shit up for comfort. The calculation is easy and requires a set of calipers and removal of the stock. Nov 12, 2009 · Scope height is irrelevant. 5” mount) and a stock Trijicon RMR mount for the ACOG. 6 inches above the center of the barrel, or the bore. 5x and 4x models using a stock base (1. Mount height (ACOG): 1. Dec 28, 2024 · Height over bore The center bore or interior of the barrel is naturally going to be lower than the sighting mechanism on the firearm because almost all sights sit above the bore, even if the sights are mounted directly to the barrel. This article from our archives proposes one way to identify “overbore cartridges”. 75” scope offset, was dead-on at 20 yards but was 2. Boresighting is a process of placing one's line of sight down along the bore axis. Well. The BDC is going to be extremely off. While running some calculations recently, I wondered how much sight height affects my ballistics. Rod length, crankshaft stroke, and piston compression height are three variables that are key to choosing the perfect rotating assembly. Apr 24, 2023 · Other Things to Consider When Measuring Scope Height Sight height, also known as height over bore, is necessary to help calculate your scope ring center line in setting up your rifle. g. For sight height or height over bore, my approach is to measure the distance from the barrel’s center to the center of the scope body or scope rings. 22K subscribers 21 Aside from the night vision argument, height over bore doesn't matter much because it's compensated for in whatever ballistic calculator you use. Jul 22, 2007 · I get ring height, but was asking about "at what height over the bore should the center of the scope be?" Depending on bases and rails, 1. One of the questions the Sinclair technical staff receives on a regular basis is how one can find the scope center height to the center line of the bore for their rifle. Mar 6, 2009 · Re: Importance of scope height to barrel This is a good discussion, so the bottom line, as I perceive it, is that the scope height above barrel has to be tailored to your individual comfort and acceptable cheek weld. This principle refers to the vertical distance between the rifle's bore axis and the line of sight through the optic. 910” Height over bore: 4. Today we’re looking at why that matters and how to compensate for it. 125” Trijicon ACOG + RMR There is some variability based on exactly which ACOG model and which mount you use. There will also be less contact for your cheek, and depending on how tall it is, you may even be forced to do a chin weld instead. For an AR-15, we generally assume that the iron sight plane has a 2. Thanks to all the readers from the last, oh, couple of decades. Not to be confused the term bore axis which is used to describe the height of a handgun’s bore relative to the height of the shooter’s hand. That’s measured from the center of the barrel’s bore to the tip of the front sight. When using a ballistics calculator, the question of sight height or height over bore will come up. Details in the video below, or scroll down for the full transcript. Height Over Bore (HOB) is the distance between your firearm’s bore axis and the center of your reticle. The primary reason for muzzle rise is that for nearly all guns, the bore axis (longitudinal centerline of the barrel) is above the gun's center of mass, while the contact points between the shooter and the gun (e. 500” Height over bore (RMR If you do find yourself wanting a taller optic, keep in mind the taller you go with your optic, the greater your height over bore will be. In pistols, bore axis describes the height of the barrel and slide above the shooter's grip, and while it isn't a characteristic that all shooters consider when buying a pistol, they probably should. 22K subscribers 21 How to measure height over bore accurately? I've always just laid a ruler on the side of the gun and tried to get it pretty close but I'm hoping there is a better way so I can gather better data from ballistic calculators and make parallel bore sighting easier. The . Just a quick video explaining what "Height over Bore" is, and why it should be important to you. 25”. Aug 30, 2019 · Mechanical offset (or sight height over bore) is the reason your rifle seems to shoot low at closer distance. This is described as height over bore. 6″ above the center of the bore Lower 1/3 co-witness – optic is mounted slightly higher than the iron sights or about 2. 5”) had a shot height variance of 3. 26" - The Best AR-15 Optic Height? | 9-Hole Reviews Height Over Bore Explained and Why an Elevated Red Dot Is Better Free Range American 88. The only way to mitigate that extreme height over bore is to zero at 100 yards which will be a tall order since you cannot get a good grouping due to lack of a cheek weld and consistent eye relief. The 300 yard mark that you think will strike at 300 will be way off. Who knows, something might come back, one day. The flatness of the trajectory of a projectile is determined by a couple factors, including BC, velocity, and launch angle. While I would love to just have them there in perpetuity, it was basically a cost I didn’t want to have to cover anymore. The inside of an engine is a fickle ecosystem where every component directly affects another. 25” high at 50 yards. Mar 24, 2023 · Absolute co-witness – Optic is mounted at the same height as the iron sights or about 2. 3K subscribers Subscribed Jan 12, 2026 · You have full visibility of the front and rear iron sights through the optic. 308, with a 1. So. 54" vs 1. Find out if you need low, medium, or high scope rings. Sep 26, 2016 · Height over bore or sight height, is usually a measurement asked for by ballistic calculators to help calculate your "dope" for your specific rifle/set up. If you are level and have great rifle fit & sight picture, a tall height over bore is no issue. Jun 6, 2023 · The rifle with the greatest scope over bore difference (AR-15 at 2. grips and stock) are often all below the center of mass. The optical sight will be at standard mounting height, in direct alignment with the iron sights. Feb 1, 2023 · Sight over bore, also known as sight height, refers to the distance between the shooter’s eye and the barrel of the firearm when aiming down the sights. A larger HOB means that the sight line is much higher and further away from the barrel. 50" yields different height over the bore. This post shows how to determine your AR15 height over bore, or sight height, to be used in a ballistic calculator. Traditionally it has always been considered better to have as little height over bore as possible, but as technology and tactics have progressed, the application of height over bore has become a… Nov 1, 2016 · Height above bore depends on height of rings and bases so it can vary a fair amount with a given scope on a given rifle. MUZZLE awareness, and HEIGHT over BORE professionalism. Sep 28, 2018 · September 28th, 2018 “Overbore” — A Practical Definition by the Numbers What is “Overbore”? That’s a question rifle shooters can debate to no end. The scope over bore height becomes important because it affects the relationship between the line of sight through the scope and the trajectory of the bullet exiting the barrel. There are a few procedures that are commonly used to find sight height. Sep 7, 2020 · Height over bore, or to put in layman’s terms; The distance between the point of aim to the bore of the weapon itself. The side mount has to be tall enough to clear your dust cover and usually only provides a section of Picatinny rail; you’ll still need a mount or scope rings to attach your optic to the rail. It should be noted this rifle was sighted in 1” high at 25 yards, so the difference is closer to 2. Shots with the same trajectory as a gun with a scope mounted crosswise or mounted under the barrel. Jul 5, 2023 · The Elcan SpecterDR takes a beating sometimes - but is that negativity justified? Here's an in-depth look at the oft-maligned LPVO. Aug 22, 2023 · What Should the Absolute Co-Witness Height Be? The height that the optic needs to sit at is 2. Further Sometimes, the sight height above bore, or the distance between the bore’s center and the objective’s center, needs to be taken into consideration. If those are held constant, a gun without a scope shots with the same trajectory as a gun with the scope mounted 100 feet above the bore. Use code YOUTUBE10 for 10% off your next Steel Target order: The bore axis of a firearm is the longitudinal axis through the geometric center of the gun barrel. The counter to this is height over bore, so that the gun is always fired at a slight upward angle, crossing at the first or penultimate zero, and then falls in to where you have your second or ultimate zero set. ago Fuck height over bore all my homies do height under bore 1 Reply 1 / 2 This post shows how to determine your AR15 height over bore, or sight height, to be used in a ballistic calculator. Here's a deep dive into their definition and effects. They went. 25” over the 30-yard change. This distance can affect the alignment of the sights and the point of impact of the bullet, particularly at close ranges. Jul 1, 2025 · But what does height over bore meaning actually mean, and why is it so crucial for accurate shooting? This comprehensive guide dives deep into the concept, explaining its principles, impact on accuracy, and practical implications for shooters of all levels. May 25, 2025 · Well, basically they cost me hundreds of dollars a month, and didn’t make much money. Mount height: 2. Nov 18, 2019 · What do long-stroke, short-stroke, oversquare, or undersquare mean? How do they affect engine performance? And which is better?. Jun 15, 2022 · Mathematical formula for determining the right scope ring height. 1 Reply [deleted] • 2 yr. In contrast to most other shooters, bullets in EFT actually come out of the barrel of your gun, and when ADSing you look through the scope somewhere above the gun. What does everyone else do to measure the height of their scope above the bore? For a follow-up question how far off the actual height do you think you can be until it Sep 28, 2018 · September 28th, 2018 “Overbore” — A Practical Definition by the Numbers What is “Overbore”? That’s a question rifle shooters can debate to no end. This measurement is one of the variables used by most ballistic programs. 25" - 1. 6″ height over bore (HOB). The word nautical derives from the Latin nauticus, from Greek nautikos, from nautēs: "sailor", from naus: "ship". It already is. At 0 to 15 yards simply holding over the target was refined by using the third horizontal from the top. Aug 18, 2021 · Absolute Height With an absolute cowitness configuration, as pictured with the EOtech above, the center of the optic lines with the height of the iron sights. If it's measured and input correctly, it doesn't matter what your height over bore is. Jan 7, 2024 · When a scope is mounted on a rifle, it is positioned above the barrel. 3K subscribers Subscribed Your sight height is the height above the centerline of the bore. In a rifled barrel, the projectile (bullet / ball, pellet or slug) will spin around the bore axis as it goes through the barrel. The difference in height between the barrel and the center of your scope is known as "Height-over-Bore", and it's the reason why bullets in tarkov tend to hit a bit low at short range. HOB affects the bullet trajectory, especially if you are shooting at long range. Jared explains why it may seem like this because of the height of the optic over the bore of the rifle. Sep 21, 2022 · Height Over Bore: What is it and Why does it Matter? Country Boy Guns 2. May 4, 2018 · Height over bore impacts rifle fit and the magnitude of cant influence. 93" vs 2. Oct 24, 2022 · Depending on your rifle, mount, and optic, you may find that your height over bore with a side mount is considerable. Sep 17, 2015 · Height over bore is a term that is used to describe the difference between the two parallel axis, specifically the barrel of a rifle and the shooter’s line of sight through their optics or iron sights. 1. Same Sep 21, 2022 · Height Over Bore: What is it and Why does it Matter? Country Boy Guns 2. Some remain current, while many date from the 17th to 19th centuries. I alway measure if I`m wanting exact. Instead of trying to guess how high to hold a dot over, I just defined a new cross-hair in the scope, placed it on the target and pressed the trigger. However, I'm curious. Jan 4, 2024 · In the world of firearm optics, the height over bore concept plays a crucial role in determining how a shooter engages with their rifle. The complete guide to large-bore and small-bore trombones, and all the available trombone sizes ranging from contrabass to soprano trombone. We think the approach outlined here is quite useful, but we know that there are other ways to define cartridges with “overbore” properties We would like to show you a description here but the site won’t allow us. Let me know if you think I missed anything, or you have any Aug 12, 2025 · Understanding the height over bore meaning allows for informed decisions on optic selection and firearm setup, ultimately leading to improved shooting performance. From there on out, it becomes a training thing for different distances quickly. How to measure height over bore accurately? I've always just laid a ruler on the side of the gun and tried to get it pretty close but I'm hoping there is a better way so I can gather better data from ballistic calculators and make parallel bore sighting easier. We think the approach outlined here is quite useful, but we know that there are other ways to define cartridges with “overbore” properties Dec 28, 2021 · This simplifies the height over bore issue with optics on an AR. Mar 14, 2025 · Height Over Bore (HOB) is the vertical distance between the centerline of your rifle’s bore and the centerline of your optic or sight.