Quick Facts
| Manufacturer | Bertram |
| Cartridge | 33XC |
| Product | New, unprimed brass cartridge cases |
| Performance class | Competition ELR |
| Case type | Rimless, bottleneck |
| Standards status | David Tubb / Superior Shooting Systems XC design; use matching XC chamber and tooling |
| Country of manufacture | Australia |
| U.S. distributor | Desert Tech Munitions |
Important: This listing is for new, unprimed brass cartridge cases only. It is not loaded ammunition and contains no primer, powder, or projectile.
Why Choose Bertram 33XC Brass?
- New-production brass for a specialized precision or magnum cartridge
- Correctly headstamped for identification and load-record management
- Manufactured by Bertram in Australia
- Imported and supported in the United States by Desert Tech Munitions
What This Cartridge Was Designed to Do
The 33XC was developed by David Tubb as an extra-capacity .338-caliber cartridge for extreme-long-range competition. Tubb's published technical write-up describes approximately 139 grains of water capacity and a long neck intended to support heavy ELR projectiles.
Typical Rifle Platforms
- Custom ELR bolt-action rifles chambered for 33XC
- Competition rifles using the specified XC chamber and loading tools
- Heavy-class or unlimited-class precision platforms where rules permit
Compatibility warning: Match the brass to the exact chamber, reamer specification, dies, and rifle. This is especially important for proprietary and non-standardized ELR cartridges.
Best Suited For
- ELR competition
- Heavy .338-caliber projectiles
- Custom single-feed precision rifles
- Advanced match-ammunition development
Did You Know?
The “XC” designation means eXtra Capacity and identifies the cartridge family developed by David Tubb.
Product and Reference Specifications
| Manufacturer | Bertram |
| Condition | New |
| Primed | No |
| Material | Cartridge brass |
| Case type | Rimless, bottleneck |
| Performance class | Competition ELR |
| Standards / compatibility note | David Tubb / Superior Shooting Systems XC design; use matching XC chamber and tooling |
| Country of manufacture | Australia |
| U.S. distributor | Desert Tech Munitions |
Precision Case Preparation
- Inspect every case before use
- Check case length, neck condition, primer pocket, and flash hole
- Use dies and bushings matched to the exact chamber and intended neck tension
- Measure loaded-round clearance before neck turning or changing neck thickness
- Track firings and annealing intervals consistently
- Use authoritative published data or the rifle builder's approved guidance
Precision-loading note: This page does not provide loading data. ELR cartridges may use proprietary chambers, custom throats, and specialized components; confirm every dimensional and pressure assumption before loading.
Availability & Production
Bertram manufactures many precision, ELR, and discontinued magnum cases in scheduled production runs. Desert Tech Munitions maintains U.S. inventory when available and supports qualified dealer and OEM buyers.
Why Buy from Desert Tech Munitions?
- Authorized U.S. Bertram distributor
- U.S. inventory and domestic shipping when available
- Direct working relationship with Bertram
- Dealer and OEM programs for qualified buyers
Frequently Asked Questions
Is this loaded ammunition?
No. This listing is for new, unprimed brass cartridge cases only.
Is this cartridge standardized?
David Tubb / Superior Shooting Systems XC design; use matching XC chamber and tooling
Should new cases be sized before loading?
Inspect every case. Sizing, expanding, neck turning, or mandrel work should be based on the actual chamber, dies, projectile, and desired neck tension.
Why is this brass produced intermittently?
Demand is specialized, so production is generally scheduled in batches rather than maintained continuously.
Precision, ELR & Modern Magnum Collection
Select any cartridge below to view its brass, pricing, and availability.
