Understanding dram equivalents is crucial for anyone involved in reloading ammunition, particularly those working with 20 gauge shotshells. This chart provides a detailed breakdown of dram equivalents, clarifying the relationship between powder weight, shot weight, and the resulting pressure within the cartridge. Accurate measurements are paramount for safe and effective reloading, so using a reliable scale is essential.
Understanding Dram Equivalents
The term "dram equivalent" refers to the weight of gunpowder expressed in drams. Historically, a dram was a unit of weight equal to 1/16 of an avoirdupois ounce (approximately 1.77 grams). While the system is antiquated, it remains a common convention in shotshell reloading. The dram equivalent isn't just about the powder weight; it also implies a specific shot charge weight and overall pressure that is generally considered safe within the confines of the specific shotshell hull and associated components.
Important Note: This chart is for informational purposes only. Always consult your reloading manual for specific load data pertaining to your chosen components (powder, primers, wads, shot, and hulls). Improper reloading can lead to dangerous pressure increases and catastrophic equipment failure, resulting in serious injury or death.
20 Gauge Dram Equivalent Chart (Sample Data)
This is a SAMPLE chart. Do not use this chart for actual reloading. This table demonstrates the format of a dram equivalent chart. The actual values will vary significantly depending on the powder type, shot type, and other components used. Always consult a current reloading manual for precise load data.
| Dram Equivalent | Powder Weight (grains) | Shot Weight (oz) | Wad Type (Example) | Notes |
|---|---|---|---|---|
| 12.5 | (Example: 18 grains) | (Example: 7/8 oz) | (Example: Claybuster) | Use with caution - verify in manual |
| 13 | (Example: 19 grains) | (Example: 1 oz) | (Example: Claybuster) | Use with caution - verify in manual |
| 13.5 | (Example: 20 grains) | (Example: 1 1/8 oz) | (Example: Claybuster) | Use with caution - verify in manual |
| 14 | (Example: 21 grains) | (Example: 1 1/4 oz) | (Example: Claybuster) | Use with caution - verify in manual |
| 14.5 | (Example: 22 grains) | (Example: 1 3/8 oz) | (Example: Claybuster) | Use with caution - verify in manual |
Key Considerations:
- Powder Type: Different powders burn at different rates and generate varying pressures. Using the wrong powder can be extremely dangerous.
- Shot Weight: The amount of shot significantly impacts the pressure generated within the cartridge.
- Wad Type: Wads play a crucial role in controlling pressure by sealing the gases and providing a consistent shot column.
- Hull Type: The strength and design of the shotshell hull influence its ability to withstand pressure.
- Primer: The primer provides the initial ignition of the powder charge. Using an inappropriate primer can also lead to pressure problems.
Safety First: Always Consult a Reloading Manual
This chart should never be used as a sole source for reloading data. Always consult a comprehensive, up-to-date reloading manual from a reputable manufacturer. These manuals contain detailed load data for specific components and provide critical safety information. Remember, reloading ammunition is inherently dangerous, and improper techniques can result in serious injury or death. Always prioritize safety and accuracy.
Finding Reliable Reloading Manuals
Numerous manufacturers publish reloading manuals, many of which are available for free on their websites (although some may require registration). Check the websites of major powder manufacturers and shotshell component suppliers for their most current and relevant data. Remember to always follow the instructions precisely.
This guide offers a foundation for understanding dram equivalents in 20 gauge reloading. However, safe and successful reloading depends entirely on consulting the correct reloading manual and meticulously following its instructions. Never compromise safety when working with firearms and ammunition.
