The Differences Between P Brass and Regular Brass for Reloading
In the world of reloading ammunition, the term 'P brass' is often used, but it's important to clarify what it means.
What is P Brass?
P brass refers to a type of brass casing that is specifically designed to withstand higher pressures, particularly for defensive handgun rounds. However, it's crucial to note that P brass is not a distinct type of brass by itself. Instead, it's a term used to describe a higher pressure load that typically uses nickel-plated brass cases. This material is slick and more expensive, enhancing reliability in feeding mechanisms.
Physical Characteristics of P Brass
The dimensions and thickness of P brass are the same as regular brass cases for the same cartridge. What sets P brass apart is the nickel plating, which is used to improve feeding reliability. This makes P brass cases appear as very shiny and silver. Using P brass for hand loading is preferable due to its improved performance under high-pressure conditions. However, it's important to exercise caution and do extensive research, as it's easy to overpressure the rounds if not careful.
Recommended Ammunition for Handloading P Rounds
For those planning to handload P rounds, I recommend using heavy bullets and slower-burning powders to mimic the recoil impulse of defense rounds without exceeding standard pressures. My personal choice is the Federal HST 147gr for my 9mm EDC (Every Day Carry) ammunition. When loading P rounds, ensure the firearm's chamber is rated to handle the increased pressure, as not all guns are suitable for P loads.
Case Dimensions and Pressures
Case dimensions and thickness are established to safely contain a set pressure based on SAAMI (Shotgun Ammunition Manufacturers Institute) specifications for a caliber. P loads are of higher pressure, which may result in greater case thickness and less internal volume. Therefore, the pressure with a given load may differ.
Significance of Volume and Pressure
When the internal volume of the case is reduced by 4%, and the pressure is still near the middle of the road, the difference is not significant. However, if the load is near the maximum pressure, a more detailed calculation is necessary. Military casings in rifle calibers often have slightly less case volume than civilian casings, further highlighting the importance of considering these factors when reloading.
Head Stamps and Safety Concerns
It's important to pay attention to the head stamps on brass cases. In the context of P brass, these stamps ensure that the loads are not inadvertently fired in a firearm not rated for P pressure levels. By doing so, shooters can avoid potential safety hazards and ensure that their brass is suitable for the intended use.
Conclusion
Understanding the differences between P brass and regular brass is crucial for successful reloading and safe ammunition use. P brass, with its nickel plating, is designed for higher pressure loads, but it's essential to exercise caution and follow best practices when handloading. Whether you're a dedicated handloader or a casual shooter, staying informed about these nuances can enhance your experience and safety in the world of reloading.