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August 30th, 2012

Mirage Shields Tame Barrel Heat for MoreAccurate Shooting

Even if you dont shoot competitively, you can benefit from having a mirage shield on your barrel. The

shield helps prevent barrel heat from cooking the air in front of your scope, which can distort the view

you see through the optic. Barrel heat creates a mirage effect that can blur the target image and

actually shift your apparent aiming point up and down. Competitors know that a mirage shield helps

them shoot smaller groups and better scores. Mirage shields can likewise benefit Varmint shooters on

those hot summer groundhog and prairie dog expeditions.

Make a Mirage Shield from Discarded X-Ray Film

Forum member Fabian from Germany, whose Sako 6BR was featured as a Gun of the Week, has

devised a clever and inexpensive mirage band option. Fabian is a radiologist by trade. He notes that

many X-ray machines require a daily test film for calibration. These are normally just discarded in the

trash, so you can get them for free.

Fabian explains: Im a radiologist, so I handle med ical x-ray films every day. Modern X-ray machines

use laser-based printers and they need to print a test-film every day. One x-ray film is about 4335 cm

(16.9 x 13.7). Made from polyester, the films are very stable and only 0.007 inches thick. They are

light-weight, semi-transparent, and very stable. Using normal scissors, you can easily cut four mirage

shields from a single sheet of film. Then glue on some velcro to attach to your barrel. Try it, you will not

be disappointed.

More Do-It-Yourself Ideas

Other forum members have made mirage shields out of common, inexpensive materials such as old

venetian blinds, thin plastic edging strips, and even cardboard reinforced with strapping tape. Theres no

magic material. However many shoo ters have found that wider shields (extendin g well past the barre l

sides) work better than narrow shields, particularly in hot weather.

Mirage Shields with Printed Designs

If you prefer to purchase a mirage shield, Shotmaster 10X offers a wide variety of shields starting at

just $5.00 for a plain white 18 shield. Patterned shields (including camo designs ) are priced by length:

$8.50 (18), $9.50 (20), $11.00 (24). All Shotmaster shields come with two (2) velcro patches with

self-stick adhesive.

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September 13th, 2011

Cartridge Brass Alloys Revealed by X-Ray Spectrometers

Are there significant metallurgical differences in the alloys

used in various brands of cartridge brass? The answer is

yes, and we have proof. Using a state-of-the-art X-Ray

Fluorescence Spectrometer, some tech-savy Wisconsin

shooters recently analyzed the alloys in seven different

types of cartridge brass.

The test results revealed significant differences in the

percentages of copper and zinc in the different brands.

Copper content ranged from a low of 72% by mass

(Winchester, S&B) to a high of 80% by mass (Remington).

Zinc, which adds hardness to the alloy, ranged from a low

of 20% by mass (Federal) to a high of 36% (brown box

Lapua). Interestingly, the tests, as reported by Forum

Member Fred Bohl, revealed that the alloy in the new blue box 6mmBR Lapua brass is different than

the alloy in Lapuas older brown box 6mmBR brass. Specifically, the blue box 6mmBR brass has more

copper and less tin (by mass). Heres a summary of the X-Ray Fluorescence spectrometry tests:

This testing was done at major science laboratory, using high-grade X-Ray Spectrometry Analyzing

equipment. Fred reports that: The data was run by one of the club members with the permission of the

test lab supervisor who is also a club member and shooter. The data in original output reports was far

more detailed about trace elements at lower orders of magnitude primarily from surface contaminants

(some were rerun after establishing a repeatable cleaning procedure). The testing process is discussed

in this Shooters Forum thread.

We do NOT have the metallurgical e xpertise to i nfer that any particular alloy shown above is better

than another. The alloy blend is merely one of many variables that can have an impact on the

performance and quality of the finished product. Annealing times/methods differ and some cartridge

brass is extruded while other cartridge brass is made with the traditional drawing process. Readers

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Permalink Bullets, Brass, Ammo, Ne ws 3 C om me nts

should not presume, on reading the above chart, that they can identify the best shooting brass simply

based on the constituent metals in the various alloys.

General Observations about Cartridge Brass Alloys

With the cartridge brass X-Ray Spectrometry results in hand, Fred Bohl hoped to find out what real

world conclusions (if any) we could draw from the raw data. Fred sent the test results to some

knowledgeable metallurgists, soliciting their comments. Fred explains: When I first posted this

information [in the Shooters Forum], I had hoped to elicit replies from expert metallurgists and to

initiate a useful discussion. From [their replies] I distilled the following consensus comments:

1. The range of Copper/Zinc ratios suitable for use in cartridge making by typical processes is 85/15 to

65/35 (% by weight or mass).

2. The range of Copper/Zinc ratios suitable for use in cartridges intended for reloading is 80/20 to

70/30. Above 80% copper, the resulting case would tend to be too soft and difficult to attain the

distribution of hardness desired (harder at the base and softer at the neck). Below 70% copper the

resulting case would tend to be too hard, would work harden too quickly and require frequent annealing.

[Editor: That said, the brown box 6mmBR Lapua brass, with 62% copper/36% zinc content, enjoys an

unrivaled reputation for both accuracy and its ability to perform well after a dozen or more reloadingcycles. We know 30BR shooters who have shot the same old-style Lapua brass (6mmBR parent case)

more than 50 times. So maybe the expert view needs re-thinking. ]

3. As the percentage of zinc increases, the tensile strength, yield strength and hardness tend to

increase. However, above 35% zinc, while tensile strength will continue to tend to increase, both yield

strength and hardness will tend to begin to decrease.

4. The trace additives of iron and/or silicon are used to control the processing characteristics of the

alloy. Trace additions of chromium will improve corrosion resistance and give a shinier surface (both

largely cosmetic).

5. Selection of the alloy and additives is a trade off among: end use desired properties processing time

and yield and cost of materials. For example, the classic 70/30 cartridge brass was considered an

optimum combination of corrosion resistance and hardness for single use by the military with good

process yield at acceptable material cost.

6. All of my responding experts were surprised by the brown box Lapua alloy except for the oldest. He

remembered using an almost identical alloy late in WWII when copper was in very short supply for

military small arms ammunition.

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