When choosing airgun ammunition, beginners are often faced with acronyms that can be confusing. One of the most common markings on cans of lead bullets is PS. Many people mistakenly believe that this is the name of a specific series or brand, but in fact everything is much simpler and more functional.
On air ammunition markings, the letters usually indicate the type of bullet head. This is a critically important parameter that affects the accuracy of fire, penetration and flight path. Understanding what's behind the label PS, will help you avoid buying the wrong bullets for your rifle or pistol.
In this article, we will look in detail at what the abbreviation means, for what purpose it is intended, and why this particular type is often recommended for initial training. You will learn about the physical characteristics of lead products and understand how shape affects shot performance.
Abbreviation and purpose
Abbreviation PS stands for “Bullet Spherical” or, in a more precise technical description, “Bullet with a Spherical Head”. This is a classic type of ammunition that has a hemispherical tip. It is this form that is the standard for most types of pneumatics that work on the principle of pushing a bullet with compressed air (PCP, spring-piston, CO2 gas).
Main purpose PS — universal shooting at medium distances. The spherical shape of the nose ensures optimal distribution of air pressure when firing, which is especially important for weapons with low and medium power. Unlike pointed bullets, spherical bullets are less susceptible to ricochets from hard surfaces at sharp angles, which makes their use somewhat more predictable on the shooting range.
⚠️ Attention: Despite its “harmless” shape, a 4.5 mm lead bullet has high penetrating ability when leaving the barrel of a powerful rifle. Always use a certified bullet catcher and make sure your targets are safe.
It is worth noting that in some catalogs you can find the designation Domed (dome), which is a complete analogue of the PS in the Western classification. If you see the inscription on the can Diabolo Dome or just Dome, know that inside there are the same bullets with a semicircular tip. They differ from flat (Wadcutter) and pointed (Pointed) in the profile of the head part, which directly affects the aerodynamics.
Physical characteristics and design
Bullet PS made from soft lead, often with the addition of a small amount of antimony to give the necessary hardness. Structurally, it is a body with a hemispherical head and a shank with a skirt. The skirt plays a key role: it serves to compact gases (obturation) in the barrel and stabilize the flight by shifting the center of gravity.
The weight of the ammunition is one of the main parameters. Standard 4.5mm (.177) PS bullets typically weigh between 0.49 grams and 0.68 grams. Lighter bullets (0.49–0.54 g) develop higher muzzle velocity, but lose energy faster. Heavy variants (0.60–0.68 g) fly slower, but penetrate obstacles better and are less blown away by the wind.
Effect of alloy on accuracy
Lead alloys can have different hardnesses. Lead that is too soft can lead to leading of the barrel (metal sticking to the rifling), while lead that is too hard can worsen the seal, reducing the power of the shot. High-quality PS bullets undergo hardness testing.
The bullet diameter also varies. Although the standard is 4.5 mm, the actual diameter can be 4.49 mm, 4.50 mm, 4.51 mm and even 4.52 mm. For accurate shooting, you need to select a bullet that matches the bore diameter of your specific weapon. A bullet that is too narrow will leak gases, and a bullet that is too wide will be difficult to fire and excessively contaminate the barrel.
Below is a table showing the dependence of the weight of the PS bullet on its diameter and intended area of application:
| Bullet weight (g) | Diameter (inch) | Weapon type | Distance |
|---|---|---|---|
| 0.49 - 0.52 | .177 (4.5 mm) | Spring rifles, pistols | 10-20 meters |
| 0.53 - 0.56 | .177 (4.5 mm) | PCP medium power rifles | 20-40 meters |
| 0.60 - 0.68 | .177 (4.5 mm) | Powerful PCP, hunting models | 40-60 meters |
| 0.90 - 1.20 | .22 (5.5 mm) | Hunting rifles | 30-50 meters |
Advantages of a spherical shape for shooting
Why the bullet PS so popular among athletes and amateurs? The main reason lies in the versatility of the airfoil. The spherical head creates less drag compared to a flat bullet (wadcutter), which allows you to maintain speed better at a distance. However, it is not as sensitive to the quality of barrel rifling as pointed bullets.
Another important aspect is the predictability of rebound. When shooting at steel targets or hard objects, a pointed bullet may go in an unpredictable direction, while a spherical bullet will often ricochet at a more predictable angle (though this does not make it safe!). In addition, the form Diabolo Dome provides excellent accuracy at distances up to 50 meters, which covers 90% of the shooter’s tasks.
For sports shooting at paper targets, a spherical bullet leaves a fairly clear breakdown, although it is inferior in this regard to a wadcutter. However, when shooting at plate targets (that fall or ring), the PS performs ideally, since it has sufficient mass to trigger the target mechanics even at medium distances.
Comparison of PS with other types of bullets
To finally understand the location of the bullet PS in the shooter's arsenal, let's compare it with other common types. The main competitors are flat (Wadcutter) and pointed (Pointed) bullets. Each type has its own niche of application, and the choice depends on the specific task.
Flat bullets are designed primarily for punching round holes in paper at distances up to 10 meters. They create a clean breakdown, but at long distances their accuracy drops sharply due to high air resistance. Pointed bullets, on the contrary, have better penetration and are intended for hunting, but they are critical to the quality of the barrel and often give worse accuracy at medium distances.
- 🎯 PS (Spherical): Universal ammunition for recreational shooting, training and small game hunting at medium distances.
- 📄 Flat (Wadcutter): Specialized sports ammunition for zeroing and competitions at 10 meters on paper.
- 🏹 Pointed: Ammunition for hunting, where maximum penetration and exhaust energy are important.
So, if you want one can of bullets for "everything", then PS will be the best choice. It will forgive more mistakes in the selection of muzzle energy and will give a stable result in different conditions. However, for professional sports shooting at 10 meters it is still better to choose a specialized flat profile.
Selecting the weight and caliber for your weapon
Choosing the Right Bullet PS is a selection process. There is no perfect bullet for all rifles. The power of your airgun directly dictates the required ammunition weight. If the bullet is too light for a powerful rifle, it may not have time to stabilize in the barrel or, conversely, fly away too quickly, losing accuracy due to supersonic transition (if the speed exceeds 330 m/s).
For weak pistols (7.5 J), light bullets weighing 0.49–0.52 g are optimal. They will allow you to develop the maximum speed available to the mechanism. Powerful magnums (25-30 J) and PCP rifles (40 J and above) require heavy bullets weighing 0.60 g and above. The use of light bullets in powerful weapons not only reduces accuracy, but can also damage the airgun due to too rapid acceleration of the piston.
Before buying a large package of bullets, buy 2-3 different cans (of different weights and manufacturers) of 100-200 pieces. Shoot them and choose the one that gives the best accuracy in your barrel.
Caliber also matters. The standard 4.5mm (.177) is flatter and suitable for long-range shooting. The 5.5 mm (.22) caliber has more stopping power and is heavier, which makes it preferable for hunting, but the flight path will be steeper (the bullet flails more).
Rules for the safety and storage of ammunition
Lead bullets, including type PS, require proper storage. Lead is a soft metal that easily deforms. A dropped can from a height or prolonged storage under pressure can cause the bullets in the bottom row to become flattened. Shooting deformed bullets not only impairs accuracy, but is also dangerous, as it can lead to unpredictable ricochet.
Ammunition should be stored in a dry place at room temperature. Although lead does not rust like steel, it can oxidize, developing a white coating, especially in humid environments. It is better not to use oxidized bullets in high-quality weapons, so as not to contaminate the bore.
⚠️ Warning: Lead is toxic. After handling bullets (especially if you lubricated or handled them), be sure to wash your hands with soap and water. Do not expose your body to lead dust or shavings.
It is also important to remember the legality of use. In Russia and many other countries, pneumatic weapons with muzzle energy up to 3 J are considered a product structurally similar to a weapon and do not require registration, but restrictions on age and place of shooting remain. Weapons more powerful than 3 J require appropriate documents or a hunting license.
☑️ Check before purchasing bullets
Frequently asked questions (FAQ)
Is it possible to shoot PS bullets from a smoothbore weapon?
No, PS bullets (.177, .22) are intended exclusively for rifled air weapons. Firing them from smoothbore guns (even through bullet-catching containers) is ineffective and can be dangerous due to the low mass and speed of the projectile.
What is the difference between PS and PP bullets?
PS means “Spherical Bullet” (semicircular head), and PP means “Flat Head”. PS is universal, PP is designed for knocking out clean holes in paper over short distances.
At what age can you shoot with air guns?
According to the legislation of the Russian Federation, the purchase of pneumatic weapons with a power of over 7.5 J is permitted from the age of 18. Shooting from lower-power weapons is possible with parental consent, but adults are responsible for safety.
Why do PS bullets sometimes leave a lead residue in the barrel?
This is due to the friction of the soft lead on the rifling of the barrel. This happens especially often when using bullets that are too soft or shooting without breaks when the barrel heats up. Regular cleaning and using quality bullets (such as coated or harder alloy) will solve the problem.
What is the best PS bullet weight for hunting?
For hunting small game (crow, pigeon, squirrel) at distances up to 40-50 meters, heavy PS bullets weighing from 0.67 g (for 4.5 mm caliber) or from 1.0 g (for 5.5 mm caliber) are optimal, providing high stopping power.