December 10th, 2019

Ultimate Reloader Reviews Hawkeye Borescope Systems

Gavin Gear Ultimate Reloader Hawkeye borescope video capture slide

Gavin Gear of UltimateReloader.com recently tested Hawkeye Borescopes from Gradient Lens Corp., along with the impressive Hawkeye Video Slide System. Gavin observed: “When it comes to gunsmithing, gun inspection, and gun maintenance, a borescope can tell you things that nothing else can. And that’s why a borescope is an invaluable tool for gunsmiths, competition shooters, and gun enthusiasts.”

UltimateReloader.com MUST WATCH Video — See What Hawkeye Borescope Reveals:

READ Hawkeye Borescope Review on UltimateReloader.com »

A good borescope reveals the reality inside your barrel(s). There’s no more guesswork. All the issues associated with barrel will be revealed — carbon build-up, copper fouling, fire-cracking and more. Within a few seconds you can judge the state of your bore, and diagnose problems such as copper fouling and fire-cracking. Check out these two images. On the left is a brand new hand-lapped barrel. On the right is a barrel with heavy fire-cracking.

Gavin Gear Ultimate Reloader Hawkeye borescope video capture slide

Gavin Gear Ultimate Reloader Hawkeye borescope video capture slideGavin tested both 7″ and 17″ versions of the Hawkeye Borescope. He tested straight versions, and both long and short borescopes with a 90° eyepiece. For most tasks we prefer the 90° eyepiece. In addition to these systems, Gavin tested the the Hawkeye Video Slide and video image acquisition system, shown below.

The features are: 1. Video Slide support system; 2. Pistol barrel being inspected; 3. Borescope with quick-coupler equipped Sony camera; 4. Windows 10 PC Laptop running Hawkeye App with VIDEO Feed; 5. LED illumination for borescope.

Gavin Gear Ultimate Reloader Hawkeye borescope video capture slide

“The Hawkeye Video Slide and video image acquisition system are not intended for consumers. They are primarily used by laboratories, gun OEMs, and other commercial customers,” Gavin notes. He used the Video Slide to provide the “next best thing” to viewing through the Hawkeye itself.



What You Can See with a Hawkeye Borescope

This Gradient Lens video shows how to correctly borescope your barrel:

Hawkeye borescope POV lensA precision optical borescope is a pricey tool, but it performs critical tasks for gun-owners, and a Hawkeye’s rigid optic tube offers some important advantages over a cheap endoscope on a flexible cord. To learn how a Hawkeye borescope can help you diagnose barrel issues, you should read a Rifle Shooter magazine feature story, What the Eye Can See.

In this article, writer Terry Wieland shows how to inspect for defects in new barrels, how to recognize different kinds of fouling (in both barrels and brass), and how to spot throat erosion in its early stages. Terry uses a Gradient Lens HawkEye BoreScope. The current generation of HawkEyes can be attached to a still or video camera to record digital images. The most interesting part of the article is on the second page. There, author Wieland provides photos of various types of internal flaws that can appear in barrels. This will help you spot pitting, excessive land wear, rust damage, and damage from corrosive primers.

Wieland notes that BoreScopes aren’t just for barrels: “The borescope has other uses as well. It can be used to examine the interior of a cartridge case to look for the beginnings of a case separation or to examine the interior of a loading die that is giving you trouble. When you consider the number of tubular objects that play such an important role in rifle shooting, it is a wonder we were ever able to function without such a method of studying bores.”

Hawkeye borescope POV lens

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December 10th, 2019

How Changes in Cartridge OAL Can Alter Pressure and Velocity

Berger Bullets COAL length cartridge

Figure 1. When the bullet is seated farther out of the case, there is more volume available for powder. This enables the cartridge to generate higher muzzle velocity with the same pressure.

Berger Bullets COAL length cartridgeEffects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) – Part 1
by Bryan Litz for Berger Bullets.
Many shooters are not aware of the dramatic effects that bullet seating depth can have on the pressure and velocity generated by a rifle cartridge. Cartridge Overall Length (COAL) is also a variable that can be used to fine-tune accuracy. It’s also an important consideration for rifles that need to feed rounds through a magazine. In this article, we’ll explore the various effects of COAL, and what choices a shooter can make to maximize the effectiveness of their hand loads.

Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI)
Most loading manuals (including the Berger Manual), present loading data according to SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute) standards. SAAMI provides max pressure, COAL and many other specifications for commercial cartridges so that rifle makers, ammo makers, and hand loaders can standardize their products so they all work together. As we’ll see later in this article, these SAAMI standards are in many cases outdated and can dramatically restrict the performance potential of a cartridge.

Bullet seating depth is an important variable in the accuracy equation. In many cases, the SAAMI-specified COAL is shorter than what a hand loader wants to load their rounds to for accuracy purposes. In the case where a hand loader seats the bullets longer than SAAMI specified COAL, there are some internal ballistic effects that take place which are important to understand.

Effects of Seating Depth / COAL on Pressure and Velocity
The primary effect of loading a cartridge long is that it leaves more internal volume inside the cartridge. This extra internal volume has a well known effect; for a given powder charge, there will be less pressure and less velocity produced because of the extra empty space. Another way to look at this is you have to use more powder to achieve the same pressure and velocity when the bullet is seated out long. In fact, the extra powder you can add to a cartridge with the bullet seated long will allow you to achieve greater velocity at the same pressure than a cartridge with a bullet seated short.

When you think about it, it makes good sense. After all, when you seat the bullet out longer and leave more internal case volume for powder, you’re effectively making the cartridge into a bigger cartridge by increasing the size of the combustion chamber. Figure 1 illustrates the extra volume that’s available for powder when the bullet is seated out long.

Before concluding that it’s a good idea to start seating your bullets longer than SAAMI spec length, there are a few things to consider.

Geometry of a Chamber Throat
The chamber in a rifle will have a certain throat length which will dictate how long a bullet can be loaded. The throat is the forward portion of the chamber that has no rifling. The portion of the bullet’s bearing surface that projects out of the case occupies the throat (see Figure 2).

Berger Bullets COAL length cartridge

The length of the throat determines how much of the bullet can stick out of the case. When a cartridge is chambered and the bullet encounters the beginning of the rifling, known as the lands, it’s met with hard resistance. This COAL marks the maximum length that a bullet can be seated. When a bullet is seated out to contact the lands, its initial forward motion during ignition is immediately resisted by an engraving force.

Seating a bullet against the lands causes pressures to be elevated noticeably higher than if the bullet were seated just a few thousandths of an inch off the lands.

A very common practice in precision reloading is to establish the COAL for a bullet that’s seated to touch the lands. This is a reference length that the hand loader works from when searching for the optimal seating depth for precision. Many times, the best seating depth is with the bullet touching or very near the lands. However, in some rifles, the best seating depth might be 0.100″ or more off the lands. This is simply a variable the hand loader uses to tune the precision of a rifle.

CLICK HERE to Read Full Article with More Info

Article sourced by EdLongrange. We welcome tips from readers.
Permalink Bullets, Brass, Ammo, Reloading 2 Comments »
December 10th, 2019

Powder Valley 12 Days of Christmas Giveaways and Promos

Powder Valley Inc. Giveaway 12 days of Christmas Ammo Bullets Press Sierra Hornady Hodgdon Powder Bullets Ammo

Are you feelin’ lucky? Well here’s your chance to win. For 12 Days in December (Dec. 9-20), Powder Valley is giving away thousands of dollars worth of products from big name suppliers. This is top-of-the-line stuff, including Powder from Accurate, Alliant, Hodgdon, Ramshot, and Vihtavuori, Bullets from Berry’s, Lapua, Nosler, Sierra, Speer, and Zero, Ammunition from Hornady, Nosler, and Zero, plus Reloading Hardware from Hornady. Each day there will be a new set of prizes.

On the first Day of Christmas this year (12/9/2019) Powder Valley offered FREE Shipping on orders over $49.00, plus a free “Koozie” gift. Today, December 10th, the Second Day of Christmas, you’ll have a chance to win a Hornady LNL Classic Kit or Hornady Ammunition.

Powder Valley Inc. Giveaway 12 days of Christmas Ammo Bullets Press Sierra Hornady Hodgdon Powder Bullets Ammo

To enter the give-away contest, you need to visit Powder Valley’s Facebook Page and post a comment. Winners will be selected by lottery from those who comment as instructed. Each successive day, through December 20th, there will be another product giveaway post. On some of the 12 days Powder Valley will have additional discounts and/or FREE HazMat offers.

Powder Valley Daily Giveaway — New Prizes Every Day

For the Daily Powder Valley Contests, you need to go to the Powder Valley Facebook Page and post a Facebook Comment for the Daily Prize story. You don’t have to fill out any forms, but you must have a Facebook account so you can comment. You can enter multiple times by commenting on multiple days, but sorry, if you win, you are no longer eligible.

NOTE: You MUST post your comment on Powder Valley’s Facebook Site, NOT HERE. And you need to comment each day on the featured Daily Giveaway Post to be entered in that particular day’s contest. To have repeat chances to win you need to comment on multiple days. Got it?

Each day the folks at Powder Valley will select winners from among the visitors who commented. In days ahead there can be multiple daily winners. And on Day 12 there will be very special prize give-aways including Powder Valley Gift certificates.

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