6.5x55 136 Scenar: How Much N165 Powder?
The question of how much N165 powder to use with a 6.5x55 Swedish Mauser cartridge loaded with a 136-grain Scenar bullet is a crucial one for reloaders. Getting the charge weight right is paramount for safety and accuracy. There's no single answer, as the ideal charge depends on several factors. This guide will delve into those factors and provide a framework for determining the correct powder charge for your specific setup. Always consult your reloading manual and follow its instructions meticulously. This information is for educational purposes only and should not be considered a definitive recommendation.
Factors Affecting Powder Charge
Several variables influence the optimal N165 powder charge for your 6.5x55 with a 136-grain Scenar bullet:
- Rifle: Different rifles have different chamber dimensions and throat lengths, impacting pressure. A tighter chamber may require a slightly smaller charge compared to a more generous one.
- Bullet: Even slight variations in bullet manufacturing can influence pressure. Using a different brand of 136-grain Scenar bullet or even a different 136-grain bullet of a different design could require an adjustment to your powder charge.
- Powder: Powder lots can vary slightly. Even within the same N165 designation, subtle differences can affect performance. Consistent use of the same lot of powder is essential for repeatability.
- Case Capacity: Case capacity varies depending on the manufacturer and the condition of the brass. Older or heavily reloaded brass may have a slightly reduced capacity, necessitating a smaller powder charge.
- Primer: The type of primer used can also have a small but measurable impact on pressure.
- Environmental Conditions: Temperature and humidity can affect powder burn rate.
Why There's No Single "Correct" Amount
The lack of a single answer emphasizes the importance of following safe reloading practices. Providing a specific number would be irresponsible and potentially dangerous. Each reloader must work up their load using a methodical process of starting low, incrementally increasing the powder charge, and carefully monitoring pressure signs.
The Safe and Responsible Approach: Working Up a Load
The only responsible way to determine the correct powder charge is to conduct a load development process. This involves starting with a minimum powder charge recommended by a reputable reloading manual (such as those from Hodgdon, IMR, or Sierra) and gradually increasing the charge in small increments while meticulously documenting results and observing for signs of excessive pressure.
How to Work Up Your Load (Always consult your reloading manual!)
- Start Low: Begin with the minimum recommended powder charge specified in your reloading manual.
- Small Increments: Gradually increase the powder charge by a small amount (usually 0.1 to 0.3 grains) in subsequent rounds.
- Observe Pressure Signs: Watch for signs of high pressure, such as excessive primer flattening, hard bolt lift, or unusual noise. Any indication of high pressure requires you to stop immediately.
- Accuracy Testing: Once you've found a safe charge, test for accuracy. Shoot several groups at various charges around your safe maximum to find the charge that produces the best accuracy for your specific rifle and ammunition.
- Record Keeping: Maintain meticulous records of your load data, including powder charge, bullet weight, primer type, case brand, and any observations you make during testing.
What Does "N165" Mean?
N165 is a designation for a specific type of smokeless gunpowder manufactured by Norma. It's known for its moderate burn rate and good accuracy, making it a popular choice for various rifle cartridges, including the 6.5x55 Swedish Mauser.
Where Can I Find More Information?
The most important source of information is your reloading manual. Supplement this with information from reputable reloading websites and forums, but always prioritize the safety information provided by the manufacturer. Remember, reloading is an inherently dangerous activity if not done correctly. Safety is paramount.
Disclaimer: This information is for educational purposes only and does not constitute professional reloading advice. Always consult your reloading manual and follow its instructions meticulously. Improper reloading can lead to serious injury or death. The author and publisher assume no liability for any injury or damage resulting from the use of this information.
