Published: May 2026 | Last updated: May 2026
The RWS 4047 is a standard Large Pistol primer from RWS’s Nuremberg manufacturing facility, serving the same application range as the CCI 300, Federal 150, and Winchester WLP in North American loading rooms. Large Pistol primers seat in straight-walled pistol cases and some straight-walled revolver cases – the workhorses of handgun reloading: 45 ACP, 44 Magnum, 357 Magnum, 40 S&W, and their variants.
Like the RWS 4031 in the Large Rifle category, the 4047 brings RWS’s European precision manufacturing heritage to a market segment dominated by North American brands. It is a standard-output, non-magnum Large Pistol primer – correct for the majority of factory-equivalent and moderate handgun loads, and not the right choice for cartridges or loads specifically requiring magnum primer energy such as maximum 44 Magnum or 357 Magnum loads with slow-burning powders. For those, the Large Pistol Magnum category applies.
The 4047 fits a specific and large need: reliable, consistent ignition for standard-pressure handgun loads from a manufacturer whose quality control reflects over 150 years of continuous primer production.
Technical Specifications
| Feature | Specification |
|---|---|
| Manufacturer | RWS (Dynamit Nobel, Nuremberg, Germany) |
| Primer Size | Large Pistol |
| Category | Standard Large Pistol |
| Output Level | Standard |
| Packaging | 100-count boxes / 1,000-count cases |
| North American Equivalent | CCI 300, Federal 150, Winchester WLP |
| Magnum Application | Use CCI 350 or equivalent for magnum loads |
| Related RWS Primers | RWS 4031, RWS 5337, RWS 4171 |
The Large Pistol primer is physically larger than the Large Rifle primer in diameter – a distinction that surprises some newcomers to reloading. Large Pistol and Large Rifle primers share the same 0.210-inch diameter but differ in cup thickness: pistol primer cups are thinner to accommodate the lower operating pressures and softer firing pin strikes of pistol and revolver actions. The RWS 4047 follows this standard and should only be used in cases specifically requiring a Large Pistol primer. Using a Large Rifle primer in a pistol case inverts this relationship – a thicker cup may cause ignition failures in handguns with lighter firing pin springs.
RWS and the European Handgun Market
RWS’s reputation is built primarily on rifle ammunition and components, but the company has produced pistol and revolver ammunition for European law enforcement, sporting shooters, and hunters since the late nineteenth century. European handgun shooting sports – particularly practical shooting disciplines and metallic silhouette competition – drive demand for quality Large Pistol primers, and the 4047 reflects that demand.
The European centerfire pistol market has historically favored a different set of cartridges than the North American market. 45 ACP enjoys popularity but competes with 9mm Luger, 40 S&W, and .45 Auto in a different balance than in North America. European practical shooting competition, particularly IPSC/USPSA production and standard divisions, creates demand for consistent Large Pistol primers in high-volume loading applications.
The 4047 is positioned for this market – a reliable, consistent Large Pistol primer that European competitive shooters and hunters load in volume. For North American reloaders who encounter it, the product is straightforward: a standard Large Pistol primer from a premium German manufacturer with a recipe footprint that, while lighter in North American sources than CCI or Federal, is growing as Vihtavuori and other European powder manufacturers expand their published data.
Output Characteristics
The RWS 4047 produces standard Large Pistol output – appropriate for the full range of standard-pressure handgun loads using fast to medium-fast burning pistol powders. It is not a magnum primer and is not designed for loads that specifically require elevated primer energy to initiate complete combustion of slow-burning powders in high-volume cases.
Where the 4047 performs particularly well is in consistent ignition across varying temperature conditions – a characteristic that reflects RWS’s cold-weather manufacturing design philosophy carried from the rifle primer line into the pistol format. Handgun loads used in outdoor competition or hunting contexts are subject to temperature variation that can affect primer reliability, and the 4047 provides a stable ignition baseline across the temperature range that practical shooters encounter.
| Cartridge | Application | Primer Suitability |
|---|---|---|
| 45 ACP | Target, competition, defense | Excellent – standard LP primer application |
| 40 S&W | Competition, general purpose | Excellent |
| 44 Magnum | Standard loads only | Use LPM for maximum/slow-powder loads |
| 357 Magnum | Light to standard loads | Use LPM for maximum loads with slow powders |
| 45 Colt | Standard pressure loads | Suitable; verify recipe |
| 44 Special | All loads | Excellent match for standard LP pressure range |
| 10mm Auto | Standard loads | Verify recipe; some 10mm loads call for LPM |
| 41 Remington Magnum | Moderate loads | Check specific recipe |
The 44 Magnum and 357 Magnum entries require clarification. Both cartridges span a wide pressure range from mild target loads to maximum hunting loads, and primer requirements vary accordingly. Moderate 44 Magnum and 357 Magnum loads with fast-to-medium powders work correctly with a standard Large Pistol primer like the 4047. Maximum-pressure loads using slow powders like Alliant 2400, Hodgdon H110, or Winchester 296 often specify a Large Pistol Magnum primer to ensure complete ignition of the larger powder charge. Always check the recipe rather than assuming a universal primer choice for these cartridges.
Powder Pairings
The RWS 4047 pairs with the fast to medium-fast burning pistol powders that define standard and competition handgun loads. These are powders designed for complete combustion in the small case volumes of pistol cartridges at operating pressures well below rifle levels.
| Powder | Primary Cartridge | Notes |
|---|---|---|
| Hodgdon Universal | 45 ACP, 40 S&W, 357 Mag | Versatile; broad LP primer compatibility |
| Hodgdon HS-6 | 40 S&W, 45 ACP, 357 Mag | Medium-fast; 4047 suitable for standard loads |
| Hodgdon Longshot | 40 S&W, 357 Mag max loads | Slower; verify recipe for standard vs. magnum primer |
| Alliant Unique | 45 ACP, 357 Mag, 44 Mag | Classic LP primer pairing; decades of data |
| Alliant 2400 | 357 Mag, 44 Mag | Slow pistol powder; verify primer spec by load level |
| Vihtavuori N320 | 45 ACP, 40 S&W | Finnish powder; natural European primer pairing |
| Vihtavuori N340 | 45 ACP, 40 S&W, 357 Mag | N340 data includes standard LP primer options |
| Hodgdon H110 | 44 Mag, 357 Mag | Typically requires LPM; check recipe carefully |
The Vihtavuori N320 and N340 pairings are a natural fit: Vihtavuori develops its recipe data using European primers and the 4047 appears alongside N320 and N340 in published Vihtavuori handgun data. Reloaders building 45 ACP competition loads around Finnish powders will find the RWS 4047 a well-supported primer choice in that recipe ecosystem.
The Hodgdon H110 entry carries a caution: H110 and its ballistic twin Winchester 296 are slow-burning pistol powders that typically require a Large Pistol Magnum primer in maximum 44 Magnum and 357 Magnum loads to guarantee complete combustion. Use the 4047 with H110 only where published data specifically confirms a standard primer for that charge weight.
RWS 4047 vs. Standard Large Pistol Alternatives
| Primer | Output | Manufacturer | Supply Chain | Best Use |
|---|---|---|---|---|
| RWS 4047 | Standard | RWS (independent) | Independent | Standard LP loads; European component builds |
| CCI 300 | Standard | Vista Outdoor | Vista Outdoor | Broadest North American recipe data |
| Federal 150, Federal 200 | Standard | Vista Outdoor | Vista Outdoor | Federal component system |
| Winchester WLP | Standard | Olin Corp | Olin Corp | Wide availability; Winchester components |
| CCI 350 | Magnum | Vista Outdoor | Vista Outdoor | Maximum magnum pistol loads |
| Fiocchi Large Pistol | Standard | Fiocchi (independent) | Independent | European components; independent supply |
| Ginex Large Pistol, Ginex Large Pistol Magnum | Standard/Magnum | Ginex (independent) | Independent | Eastern European components |
The CCI 300 is the North American benchmark in this category – the most widely available standard Large Pistol primer with the deepest recipe library in North American sources. The 4047 is its closest European equivalent in output and application range. For reloaders already using European powders or seeking supply chain diversification, the 4047 is a direct and well-supported alternative.
FAQ
Is the RWS 4047 interchangeable with the CCI 300?
In physical dimensions yes – both are standard Large Pistol primers. For practical reloading, treat any primer substitution as a load development step: verify published data confirms the 4047 for your cartridge and powder combination, and confirm by working up from below maximum. Output characteristics are similar enough that velocity shifts are typically modest, but data confirmation is always the correct approach.
Can I use the RWS 4047 for high-pressure 10mm Auto loads?
Standard 10mm loads at factory-equivalent pressure levels work with a standard Large Pistol primer. Hot 10mm loads approaching maximum pressure with medium-slow powders may perform better with a Large Pistol Magnum primer. The 10mm Auto spans a wider pressure range than most pistol cartridges, so the recipe’s specified primer should always be followed.
Does the RWS numbering tell me the primer type?
Yes, with a reference. The 40xx series covers rifle and pistol primers: 4031 is Large Rifle standard, 4033 is Large Rifle Magnum, 4047 is Large Pistol standard. The 50xx series covers small primers. The 4171 is RWS’s lead-free Large Rifle primer. Once you have the pattern, the catalog is navigable.
Why is the RWS 4047 harder to find than CCI or Federal?
RWS primers are imported and not stocked by major domestic sporting goods chains. They are available through specialty importers and online retailers that carry European components. Purchasing in 1,000-count cases reduces per-primer cost and makes shipping economical.
Can the 4047 replace a Large Pistol Magnum primer in maximum magnum loads?
No. Maximum-pressure 357 Magnum and 44 Magnum loads with slow-burning powders require a Large Pistol Magnum primer for complete, reliable ignition. The 4047 is a standard primer and will not reliably initiate complete combustion in those applications.
Conclusion
The RWS 4047 is a straightforward, well-manufactured standard Large Pistol primer that covers the broad range of handgun loading applications with the consistency and quality control that RWS has maintained across its entire primer lineup. It does not offer the depth of North American recipe data that the CCI 300 commands, but for reloaders using European powders like Vihtavuori N320 or working to diversify their primer supply chain beyond Vista Outdoor brands, it is a dependable and fully capable alternative.
Use it where the recipe calls for a standard Large Pistol primer, confirm published data for your specific load, and keep it away from applications that require magnum primer energy.
Editorial note: Originally published May 2026. This article was written from scratch as a new addition to the primer section of myreloading.com. Sections cover RWS 4047 specifications and the LP vs. LR cup thickness distinction, RWS’s European handgun market context, output characteristics with a cartridge application table, an eight-powder pairing table with European powder emphasis and magnum-primer caveats, a full seven-primer comparison table for the Large Pistol category, and a five-question FAQ.
