For reloaders, understanding acronyms is crucial for safety and efficiency. One acronym that frequently pops up, especially in online forums and reloading manuals, is CBTO. But what does CBTO stand for when reloading? Simply put, CBTO stands for "Case Before The Orifice."
This term is specifically used in the context of progressive reloading presses. Progressive presses are designed for high-volume reloading, cycling through several stages of the reloading process with each press of the handle. Understanding CBTO is essential for properly setting up and using these presses.
Understanding CBTO in Progressive Reloading
The "orifice" in CBTO refers to the sizing die's opening, through which the fired cartridge case is resized. The term emphasizes the critical positioning of the case before it encounters the sizing die. If the case isn't correctly positioned before it reaches the sizing die (i.e., not CBTO), several problems can occur:
- Case Damage: Incorrect positioning can lead to the case being crushed, dented, or otherwise damaged during the sizing process.
- Inconsistent Sizing: Cases that aren't properly aligned will not be sized consistently, leading to potential feeding issues and inconsistent ammunition performance.
- Press Damage: Improper case positioning can put undue stress on the press and its components, potentially leading to damage or malfunction.
- Safety Hazards: Damaged cases can lead to dangerous malfunctions during firing.
Ensuring Your Cases are CBTO
Achieving proper CBTO positioning is primarily achieved through careful setup and adjustment of your reloading press. This often involves:
- Case Feed System: Making sure your case feed system is correctly adjusted to ensure smooth and consistent case feeding.
- Shell Plate Alignment: Proper alignment of the shell plate ensures cases are correctly oriented before they reach the sizing die.
- Die Adjustment: Correctly adjusting the sizing die's height is essential to ensure the case is fully seated before sizing. Improper adjustment can cause the case to bind or tilt, preventing proper CBTO.
- Case Length: Consistent case length is vital for proper CBTO. Cases that are too long or too short can affect their alignment.
Troubleshooting CBTO Issues
If you're encountering issues with CBTO, carefully review your reloading press setup. Check for any misalignment, worn parts, or improper adjustments. Consulting your press's manual and seeking advice from experienced reloaders can be invaluable in troubleshooting and resolving CBTO problems. Remember, safe reloading practices are paramount; always prioritize accuracy and attention to detail.
Conclusion
CBTO, while seemingly a small detail, is a crucial concept for safe and efficient progressive reloading. Understanding and ensuring proper CBTO positioning is essential for preventing damage to your equipment and producing consistent, high-quality ammunition. If you're new to progressive reloading, take the time to fully understand this concept before beginning. Your safety and the quality of your reloads depend on it.
