Manufacturing (Reloading) 7.62x39mm at Home

Manufacturing or reloading 7.62x39mm ammunition at home is generally considered more difficult and significantly less cost-effective than reloading common western calibers like 5.56x45mm NATO.

While the physical process of reloading is the same, the 7.62x39 cartridge presents several unique challenges regarding component availability and firearm mechanics.

1. Component Sourcing Challenges

Brass Availability

• The Steel-Case Problem: The vast majority of factory 7.62x39mm ammunition is steel-cased and uses Berdan primers. Steel cases are generally considered non-reloadable (or highly impractical to reload) because they lack the malleability of brass and the primer extraction process is entirely different.
• Finding Brass: To reload 7.62x39, you must source boxer-primed brass cases. Because range pickups are almost exclusively steel, you usually have to purchase expensive new brass (from manufacturers like Starline or Lapua) or hunt for premium brass-cased factory hunting loads to save the spent casings.

Bullet Variations

• Diameter Differences: Western .30-caliber rifles (like the .308 Winchester or .300 Blackout) use .308" diameter bullets, which are ubiquitous. The Soviet 7.62x39mm, however, typically requires a .310" or .311" diameter bullet.
• Selection: While .310"/.311" bullets are available, the selection is much smaller and often more expensive than standard .308" projectiles. Using a .308" bullet in a .311" bore will result in poor accuracy.

Primer Pocket Inconsistencies

• Large vs. Small: Depending on the manufacturer of the brass case, 7.62x39mm can feature either Large Rifle Primers or Small Rifle Primers. This requires the reloader to meticulously sort their brass by headstamp to avoid primer seating issues and to maintain separate primer inventories.

2. Firearm Mechanics & Brass Damage

The “Violent Ejection” Issue

• AK-47 pattern rifles (and SKS rifles) are famously over-gassed for reliability. This results in a very violent extraction and ejection process.
• Brass Destruction: AKs frequently dent the side of the case against the dust cover upon ejection and launch the brass 15 to 30 feet away. The physical damage limits the number of times a single piece of expensive brass can be safely reloaded, and finding the brass after firing is difficult.

Bore Diameter Variances

• Combloc and surplus rifles often have inconsistent bore diameters. While the spec is .311", surplus AKs or Mosin-Nagants can range anywhere from .308" to .314". Reloaders seeking precision must often “slug” their specific barrel with a soft lead weight to determine the exact inner diameter before selecting a bullet size.

3. Cost-Effectiveness

• Plinking: Historically, surplus or imported steel-cased 7.62x39 has been so cheap that reloading it for casual target practice (“plinking”) results in a net loss. The cost of new brass, powder, and specific .311" bullets often exceeds the price of buying factory steel-case by the crate.
• Precision/Hunting: Reloading becomes viable if the goal is to produce high-quality, expanding hunting ammunition or sub-MOA precision rounds for a bolt-action 7.62x39 rifle (e.g., Ruger American Ranch or CZ 600). In these platforms, brass is not destroyed upon ejection and accuracy can be significantly improved over factory loads.

Conclusion

Reloading 7.62x39mm requires specialized components (boxer brass, .311 bullets) that are harder to source and more expensive than 5.56 components. When fired through an AK-pattern rifle, the high rate of brass loss and damage makes it an economically poor choice for high-volume shooting. It is best reserved for specialized hunting or precision applications in bolt-action platforms.