AMMUNITION

101. How long can you keep ammunition for?

Do not use ammunition that is any older than 15 years.

102. How should I store my ammunition/powder?

We recommend in a cool place at a constant temperature (12-15°C) and approx. 50 per cent relative humidity. The chemicals in the powder slowly start to decompose after about 20 years. If you store the powder at a high or fluctuating temperature, this process starts earlier.

103. Why can't you use all bullet sizes in a particular gun?

Short (light) projectiles require less rifling in the barrel than long ones to achieve gyroscopic stability. Every bullet has a specified twist rate that is designed for certain projectile weights. Problems occur when you use extremely long (heavy) bullets and the twist rate is not high enough to stabilize the projectile. Example: the .308 Win has a twist rate of 12 inches. All bullets up to around 12 g are suitable. Heavier projectiles may result in an oval bullet path and reduce accuracy. Lighter projectiles receive more spin than they actually need, which is however practically without significance.

104. What should you take into account when shooting at low temperatures?

Test fire the gun at the temperatures to be expected on your shoot. Leave the gun to cool down for about an hour. You can either keep the ammunition in a jacket pocket or at the same temperature as the gun.

105. What is the difference between rimfire ignition and centrefire ignition?

Rimfire cartridges have the priming compound in the rim of the case, such as in a .22 LR. In centrefire cartridges on the other hand the firing pin strikes the primer at the centre of the case to ignite it with the priming compound located between the brass cup and the anvil.

106. Why are cartridge cases made of brass?

The case keeps the powder, projectile and primer together and ensures the tightness on the backside. It has to withstand the pressure and be capable of being removed after the shot. Brass containing 70-72% copper and the remainder zinc meets these requirements. Cases have also been made of steel, for example, but are not corrosion resistant and tool wear is greater. Softer materials such as aluminium are slightly less strong and may oxidise at the surface. Brass is therefore a very good compromise.

107. How much energy is required to ignite a primer?

This question is not very easy to answer, as it depends very much on how fast the firing pin strikes it. According to military specifications, dropping a steel ball from a given height must ignite virtually all of the primers. There are also rules where the drop height is low and none of the primers should ignite.

108. Can I use match ammunition for hunting?

According to hunting regulations, a hunting projectile must have a point that enables expansion or mushrooming. Match ammunition is not therefore allowed. In some countries there are not any regulations with the result that both types are used. A bullet that does not expand at the front quickly becomes unstable and releases energy. When a bullet comes into contact with a strong bone, it does not penetrate to the vital organs, which means it only wounds. A good shot also usually results in considerable tissue damage.

109. How loud is a shot?

Sound level is measured in decibels (dB). The decibel scale is not linear, i.e. 100 dB is not twice as loud as 50 dB. An increase of 3 dB means a doubling of the loudness. As a result, 100 dB is around 17 times as loud as 50 dB.

Different measuring methods produce different results. The figures below are based on measurements carried out in the USA.

• .22 LR from a handgun 158 dB
• .22 LR from a rifle 139 dB
• 9 mm from a handgun 160 dB
• .223 Rem from a rifle 166 dB

The level causing permanent damage to the human ear is about 120 dB, which is why you should always wear hearing protection.

110. Where can I get ammunition for old guns?

Shooting magazines frequently have advertisements. Make sure however that the ammunition bears the same designation as the gun. Using old cases can be dangerous, as brass becomes brittle after being stored for long periods.

111. Can you use .300 Win, .300 Weatherby and .300 Ultra Mag cartridges in one and the same gun?

No, under no circumstances. Every cartridge has its own designation. In this case, the number 300 stands for the caliber, i.e. 0.3 inches = 7.62 mm. The nomenclature used by the Swedish Environmental Protection Agency can be confusing at times, as it gives cartridges as caliber x case length. There are several cartridges with the same designation, which does not lead to clear classification.

112. Is there more detailed information on the new standard calibers .300, .338 and .375 Norma Mag?

When producing the current catalogue, we mentioned these three cartridges briefly as being planned but they were still undergoing development. We assumed that the .338 and .300 would be suitable both as long distance and hunting cartridges. Both are now available as cases. The .375 is still at the development stage.

113. What should I do if I only hear a click?

Wait at least 30 seconds. Point the barrel in a safe direction (bank of earth) and remove the cartridge. There are generally two possible explanations for it failing to ignite. Either the primer did not ignite as it should or the firing pin could not strike the primer properly. The reason for this could, for example, be a damaged spring, the wrong case or that the breechblock is not closed properly. Make sure that there is nothing in the barrel before the next shot.

114. What is the difference between the recoil from a normal and a magnum cartridge?

If you only compare the recoil energy, then it is easy. A .30-06 with standard load and 11.7 g bullet produces energy of 30 J, while a .300 Win Mag with the same bullet but 915 m/s produces energy of 44 J. A .378 Weatherby generates 95 J and a large cartridge such as the .505 Gibbs 149 J.

The recoil felt depends on how fast it comes and on the weight of the gun. Most people feel that the recoil from a .378 Weatherby is greater than from a .505 Gibbs because of the bullet weight and velocity. You can however effectively reduce the recoil with a good, wide butt plate and a straight gun stock.

115. Why are some cases nickel plated?

There can be several reasons for this. If you keep cartridges on a leather belt, the tannic acid soon causes a patina to form on the brass. As a result, African cartridges often have a nickel-plated case. Many people also think that nickel-plated cases look more attractive. The friction between steel and nickel is greater than between steel and brass. It is therefore conceivable that the case is extended slightly less in the chamber.