5.5 mm Pellets: Precision and Power for Compressed Air Rifles

5.5 mm (.22) Pellets for Air Rifles and PCP Air Rifles

5.5 mm (.22) airgun pellets are among the most versatile ammunition choices in the airgun world. The calibre offers an exceptionally wide selection of pellet weights, head shapes and manufacturers, and it is particularly important in modern PCP air rifles.

At CARBIN you will find a broad range of .22 calibre pellets from specialist manufacturers including JSB, H&N, Gamo, RWS, Norica, Norma, BSA and other established airgun brands. The range includes traditional Diabolo pellets with round, pointed, flat and hollow-point heads, as well as .22 airgun slugs for compatible PCP platforms.

If you want to compare .22 with other calibres, shapes and pellet weights, explore our main collection of airgun pellets. If you are still choosing the rifle itself, our range of air rifles covers different operating systems, brands and calibres.

What calibre is 5.5 mm in an air rifle?

In airguns, 5.5 mm corresponds approximately to .22 calibre. This is why the same ammunition may be described as 5.5 mm, .22 or .22 calibre.

The figure refers to the nominal diameter of the projectile. .22 sits between the very common .177 (4.5 mm) and larger airgun calibres such as .25 (6.35 mm) and .30 (7.62 mm).

Within the same nominal calibre there can still be considerable differences in pellet weight, length, head shape, actual diameter and projectile geometry. Two .22 pellets can therefore behave very differently in the same barrel.

Why is .22 calibre so popular in PCP air rifles?

.22 calibre occupies a particularly strong position in the PCP air rifle market. Compared with .177, it allows the use of heavier projectiles while still offering, on many platforms, a very useful balance of accuracy, air efficiency, shot count and ammunition availability.

This is why a large proportion of the PCP air rifles available at CARBIN are offered in 5.5 mm / .22 calibre.

Another important advantage is the enormous ammunition choice. Shooters can compare different brands, pellet weights, profiles and, in some cases, slightly different head sizes until they find a combination that performs consistently in their particular barrel.

For a broader overview of the system, calibres and platforms, see our Ultimate PCP Air Rifle Guide.

Types of .22 pellets: Domed, Pointed, Hollow Point, Wadcutter and Slugs

Not all 5.5 mm airgun pellets use the same geometry. Pellet shape can influence aerodynamic behaviour, how the projectile engages the barrel and the type of shooting for which it was designed.

.22 Diabolo Pellets vs .22 Slugs: What Is the Difference?

The growing use of .22 airgun slugs has expanded the ammunition options available for modern PCP air rifles. Although a slug and a Diabolo pellet may share the same nominal calibre, their designs are fundamentally different.

A PCP air rifle in .22 calibre is therefore not automatically optimised for every .22 slug. Barrel design, magazine dimensions, projectile length and the rifle manufacturer's technical guidance all matter.

How Heavy Are 5.5 mm (.22) Pellets?

Pellet weight in grains is one of the most useful figures when comparing .22 ammunition. The calibre covers a particularly wide range, from relatively light Diabolo pellets to heavy projectiles and slugs for compatible PCP systems.

For reference, 1 grain is approximately 0.0648 grams.

Light, Medium and Heavy .22 Pellets

There is no single ideal pellet weight for every .22 air rifle. The correct choice depends on the rifle, barrel, available power and projectile design.

These ranges should be treated as general comparison bands rather than fixed rules. A heavier projectile is not automatically more accurate than a lighter one.

5.5 mm (.22) Pellets for PCP Air Rifles

The relationship between .22 pellets and PCP air rifles is especially strong. CARBIN's current PCP range contains a very large number of rifles and variants in 5.5 mm / .22 calibre.

If you are looking for a platform capable of using a broad variety of pellet weights and, depending on the rifle, certain slugs, explore our range of PCP air rifles.

The availability of ammunition is one of .22's biggest advantages. It gives shooters the opportunity to compare different brands, weights and profiles until they find the projectile that groups most consistently in a specific barrel.

5.5 mm Pellets for Spring and Gas-Ram Air Rifles

.22 calibre is not exclusive to PCP technology. Many traditional air rifles using spring or gas-ram systems are also available in 5.5 mm.

On these platforms, pellet weight should be matched carefully to the rifle. A very heavy pellet or slug developed with high-performance PCP rifles in mind is not automatically the most appropriate choice for a more moderately powered spring or gas-ram rifle.

What Do 5.50 mm, 5.51 mm, 5.52 mm and 5.53 mm Mean?

Although the calibre is normally described simply as 5.5 mm / .22, some manufacturers offer specific pellets or slugs in slightly different diameters such as 5.51, 5.52 or 5.53 mm.

These differences are small, but they can influence how a projectile fits and behaves in a particular barrel.

A slightly larger diameter does not automatically mean better accuracy. The correct option is the diameter, weight and geometry that work most consistently in the individual air rifle.

JSB .22 Pellets: Exact Jumbo, Heavy and Monster

JSB is one of the best-known manufacturers of precision airgun ammunition and has a particularly broad range in .22 calibre.

Our JSB pellet range includes several 5.5 mm and 5.52 mm references, including Exact Jumbo Heavy and Exact Jumbo Monster. :contentReference[oaicite:1]{index=1}

The Exact family demonstrates how wide the weight range can be within one nominal calibre. A conventional Exact Jumbo, a Heavy and a Monster may all be .22 pellets while representing very different projectile masses.

.22 vs .177 Airgun Pellets

.22 pellets are generally larger and heavier than comparable .177 projectiles. This changes the behaviour of the complete airgun system, but it does not mean that one calibre is universally better than the other.

.22 vs .25 PCP Air Rifles: Which Calibre Should You Choose?

One of the most common decisions when choosing a PCP air rifle is whether to buy .22 / 5.5 mm or .25 / 6.35 mm.

.22 generally offers a wider pellet selection, lighter projectiles and good air efficiency. .25 normally uses heavier projectiles and requires a platform designed to make effective use of the additional projectile mass.

For most shooters, .22 remains one of the most versatile PCP calibres. CARBIN's PCP guide also identifies .22 as an excellent balance of pellet weight, accuracy and air efficiency. :contentReference[oaicite:2]{index=2}

For a detailed comparison, see our .22 vs .25 PCP Air Rifle guide.

How to Find the Most Accurate .22 Pellet for Your Air Rifle

There is no single .22 pellet that is universally the most accurate. Different barrels can show clear preferences for particular pellet weights, head sizes or designs.

For a useful comparison:

• use only ammunition compatible with your rifle;
• keep the test distance consistent;
• use the same shooting rest;
• compare several groups rather than individual shots;
• test different pellet weights;
• where available, compare different head sizes;
• avoid changing several variables at the same time.

This makes it easier to identify the combination of manufacturer + weight + diameter + geometry that performs most consistently in your barrel.

Which Pellets Should You Buy for Your First .22 PCP Air Rifle?

If you are buying your first .22 PCP, there is no need to start with the heaviest projectile or the most specialised slug.

A more useful starting point is to test several high-quality Domed Diabolo pellets in different weight ranges and compare their grouping.

CARBIN's guide to getting started with PCP air rifles also recommends testing different pellet types and weights, and identifies 5.5 mm / .22 as one of the most practical calibres for beginners because of its huge ammunition choice. :contentReference[oaicite:3]{index=3}

If you are preparing the complete setup, read What Do You Need to Get Started with a PCP Air Rifle?.

.22 Pellets Within the PCP Air Rifle Ecosystem

Ammunition is a fundamental part of PCP performance. Even a technically advanced PCP rifle can produce noticeably different groups depending on the pellet used.

This is why the Ultimate PCP Air Rifle Guide treats calibre and pellet choice as core parts of choosing and configuring a pre-charged pneumatic rifle.

.22 is particularly important because it combines very wide pellet availability, a large selection of compatible PCP rifles and a broad range of projectile weights and shapes. :contentReference[oaicite:4]{index=4}

Buy 5.5 mm (.22) Pellets at CARBIN

At CARBIN you can buy 5.5 mm (.22) pellets and slugs from specialist manufacturers including JSB, H&N, Gamo, RWS, Norica and other recognised airgun brands.

The wide selection of weights, shapes and diameters makes .22 ammunition suitable for traditional air rifles as well as modern PCP platforms.

Explore our JSB pellets, compare other calibres in our main airgun pellet collection, browse our air rifles or discover our full selection of PCP air rifles.

Frequently Asked Questions About 5.5 mm (.22) Pellets

Are 5.5 mm and .22 calibre the same in airguns?

Yes. In the airgun context, 5.5 mm corresponds approximately to .22 inch, and both designations are commonly used for this calibre.

How heavy are .22 airgun pellets?

The weight range is very broad. Depending on the design, .22 pellets may sit around 13–18 grains, heavier Diabolo pellets may exceed 20 grains, and specialised slugs can reach 25 or 30 grains or more.

What pellet weight is best for a .22 PCP air rifle?

There is no universal best weight. The most suitable pellet depends on the rifle, barrel, projectile design and operating setup. Testing several compatible weights is the most reliable approach.

What is the difference between 5.50 mm, 5.51 mm, 5.52 mm and 5.53 mm?

These are small diameter variations within the nominal .22 calibre. Some manufacturers offer multiple head sizes to suit different barrels.

What is the difference between a .22 Diabolo pellet and a .22 slug?

A Diabolo pellet normally has a head, narrow waist and skirt. A slug has a more cylindrical profile. They can share the same nominal calibre but behave differently in the same barrel.

Can every .22 PCP air rifle shoot slugs?

Not necessarily. Always check the rifle manufacturer's recommendations together with barrel, magazine and projectile dimensions.

Which JSB pellets are available in .22 calibre?

The JSB range includes several .22 and 5.52 mm options, including families such as Exact Jumbo Heavy and Exact Jumbo Monster. :contentReference[oaicite:5]{index=5}

Is a heavier .22 pellet always more accurate?

No. Weight is only one variable. Head size, projectile geometry, velocity and how well the pellet matches the barrel are also important.

Is .22 a good calibre for PCP air rifles?

Yes. .22 is widely regarded as one of the most versatile PCP calibres thanks to its combination of projectile weight, accuracy, air efficiency and very wide pellet availability. :contentReference[oaicite:6]{index=6}

Should I choose a .22 or .25 PCP air rifle?

For many shooters, .22 offers the more versatile balance and wider ammunition selection. .25 uses heavier projectiles and may suit shooters prioritising greater projectile mass and energy. The correct choice depends on the rifle and intended use.

Where can I find air rifles compatible with .22 pellets?

You can browse our air rifles and our dedicated PCP air rifles, where 5.5 mm / .22 has a particularly strong presence.