How to Make World-Class PCP Airgun Slugs at Home

What Are PCP Airgun Slugs?

PCP (Pre-Charged Pneumatic) airguns have undergone a revolution in recent years. Where pellets once reigned supreme, precision-swaged slugs have taken center stage in high-power airgun competition and hunting. Unlike pellets, airgun slugs are solid, cylindrical projectiles — more like a small bullet — that deliver superior ballistic consistency, better long-range accuracy, and dramatically improved terminal performance.

At Corbin, we've been engineering precision swaging tools for over 50 years. With the S-Press and the purpose-built S-Press PCP Airgun Slug Die Set, making world-class airgun slugs at home is not only possible — it's something anyone with a methodical approach can achieve.

Why Swage Instead of Buy?

Factory-loaded airgun slugs are improving, but they can't match the consistency of slugs you swage yourself. When you control every variable — alloy hardness, diameter, weight, and nose geometry — you can dial your ammunition to match your barrel's exact specifications. The result is tighter groups, better wind resistance, and projectiles that simply perform at a higher level.

There's also the satisfaction factor. There's something deeply rewarding about placing a first-place target on the wall knowing the slug in that chamber was made by your own hands.

What You'll Need to Get Started

Making PCP airgun slugs at home is a surprisingly accessible process. Here's the core equipment you'll need:

• Corbin S-Press — The backbone of your slug-making operation. The S-Press is a bench-mounted swaging press engineered for precision. It delivers consistent ram travel and force control, which translates directly into uniform slugs every time.
• S-Press PCP Airgun Slug Die Set — This die set is specifically designed for producing airgun-caliber slugs. It includes the core seating die and point forming die needed to produce competition-ready projectiles.
• Lead Wire or Lead Cores — The raw material for your slugs. Lead wire in the appropriate diameter can be cut to precise lengths to produce cores of exact weight. Corbin recommends a soft lead alloy for airgun slugs — hard alloys don't obturate properly at lower pressure levels.
• Core Cutter (Optional but Recommended) — Corbin's core cutters allow you to section lead wire into consistent-weight cores with a single lever stroke, eliminating the need to weigh every piece individually.
• Swage Lube — A small amount of Corbin Swage Lube applied to your lead cores dramatically reduces die wear and ensures clean, consistent slug formation. Don't skip this step.

The Swaging Process, Step by Step

Step 1 — Cut and Weigh Your Cores
Start by cutting your lead wire into consistent lengths. If you're using a core cutter, set it to produce cores at your target weight. If cutting by hand, weigh each core on a precision scale accurate to at least 0.1 grain. Consistency here is the foundation of everything that follows.

Step 2 — Apply Swage Lube
A very thin coat of Corbin Swage Lube on each core is all you need. Over-lubing can cause hydraulic issues in the die. A light finger-wipe across the core surface is sufficient.

Step 3 — Seat the Core
Place the lubed core into the core seating die and run it through the S-Press with a smooth, deliberate stroke. This step compresses the lead to exact diameter and removes any air pockets. The core is now perfectly sized for the forming die.

Step 4 — Point Forming
Transfer the seated core to the point forming die. Run it through the press with steady pressure. This step forms the nose geometry — whether you're making a round nose, flat nose, or hollow point profile. The die does the precision work; you just need consistent stroke pressure.

Step 5 — Inspect and Sort
Once formed, inspect your slugs visually for any surface irregularities. Weigh a sample to confirm consistency. Slugs that deviate significantly from your target weight should be set aside — these are typically caused by core-cutting inconsistency and are easy to diagnose and fix.

Dialing In for Your Barrel

Every barrel is slightly different. Most airgun barrels specify a nominal caliber, but the actual groove diameter can vary by a few thousandths. For best results, slug your barrel to determine its actual groove diameter, then size your slugs to match. A slug that is 0.001"–0.002" over groove diameter will obturate properly and grip the rifling, giving you the best possible accuracy.

The S-Press die sets are available in a range of calibers. If you need a custom size, Corbin can manufacture dies to your exact specification — one of the advantages of working with a manufacturer that has been engineering swaging tooling since 1969.

Tips from the Bench

• Keep your press and dies clean. Lead shavings accumulate and can affect slug diameter over time.
• Use consistent stroke speed. Rushing the press stroke introduces variation.
• Store finished slugs in a padded tray to prevent surface dings that can affect balance.
• Track your alloy hardness. Softer alloys (around 6 BHN or below) work best for most PCP applications.
• Start with your target weight, then experiment ±2 grains to find the sweet spot for your barrel and velocity combination.

The Results Speak for Themselves

Corbin-swaged PCP airgun slugs have been placed at the top of international airgun competitions — including sweeping multiple podium positions at the Rocky Mountain Airgun Challenge (RMAC). When you have the right tools, quality materials, and a repeatable process, the slugs you produce at home can genuinely compete at the highest levels of the sport.

Ready to start? Explore the S-Press Airgun Slug Kit and the S-Press PCP Airgun Slug Die Set in our shop, and start making world-class projectiles in your own garage.