RCBS Expander Decapping Unit 6mm (9805) is a factory replacement assembly for RCBS sizing dies in .243/6mm class cartridges, combining the expander rod, expander ball, and decapping pin in one unit. This RCBS 9805 expander-decapping unit restores full depriming and neck-expanding function in compatible 6mm bottleneck rifle dies when the original stem, ball, or pin is damaged or worn.
Key Features
- Manufacturer part number: 9805
- Product type: Expander-decapping unit assembly
- Caliber: .243 / 6mm (fits cartridges such as .240 Weatherby Magnum, .243 Winchester, and 6mm Remington in the appropriate RCBS dies)
- Components included: Expander rod, expander ball, and decapping pin, preassembled
- Intended use: Replacement for RCBS 6mm-class bottleneck rifle sizing dies
- Function: De-primes the case and expands the neck to the correct inside diameter during the sizing stroke
Special Features
- Factory replacement assembly matches original RCBS geometry so your die maintains proper neck tension and reliable spent-primer removal.
- Precision-machined expander rod and ball support concentric neck expansion, helping bullets seat straighter in 6mm cartridges.
- Integrated decapping pin comes correctly aligned on the stem, reducing setup time and helping avoid off-center contact with flash holes.
- Designed specifically for .243/6mm applications listed for part 9805, ensuring proper fit and performance instead of relying on generic stems.
Practical Benefits
- The RCBS Expander Decapping Unit 6mm (9805) suits reloaders whose RCBS 6mm sizing dies have a bent stem, worn expander ball, or damaged decapping pin and need a quick, drop-in factory replacement.
- Replacing the complete unit can solve issues like inconsistent neck tension, rough case withdrawal over the expander, or unreliable depriming caused by a compromised original assembly.
- Keeping at least one 9805 unit on your bench helps ensure that a damaged expander-decapping stem does not interrupt your .243/6mm loading sessions, especially when processing larger batches of brass.
| MANUFACTURER | RCBS |