Understanding dram equivalents is crucial for anyone reloading 20 gauge ammunition. This chart helps you convert between the weight of powder (in drams) and the weight in grains, ensuring consistent and safe loads. Accurate measurements are paramount in reloading, impacting performance and safety. This article provides a detailed 20 gauge dram equivalent chart and explains its importance.
Understanding Drams and Grains in Reloading
Before diving into the chart, let's clarify the units of measurement.
-
Grains (gr): The fundamental unit of weight in reloading, equal to 1/7000 of a pound. Powder charges are typically measured in grains for precision.
-
Drams (dr): An older unit of weight, still used by some reloaders, particularly for shotgun powders. One dram equals 27.34 grains. Converting between drams and grains is necessary for accurate powder measurements.
Why use drams at all? The dram system has historical roots in black powder reloading, and some older reloading manuals still utilize it. However, the grain system is far more precise and widely used in modern reloading practices.
20 Gauge Dram Equivalent Chart
The following chart provides dram-to-grain equivalents. Remember that these are approximate conversions. Always double-check your powder manufacturer's data for the most accurate load data. Using incorrect data can lead to dangerous pressure spikes and potentially dangerous outcomes.
| Drams (dr) | Grains (gr) (Approximate) | Notes |
|---|---|---|
| 1 | 27.34 | Minimum charge for most 20 gauge loads |
| 1 1/8 | 30.66 | Common charge for light target loads |
| 1 1/4 | 34.17 | Moderate charge for field loads |
| 1 3/8 | 37.69 | Heavier charge for hunting loads |
| 1 1/2 | 41.01 | Often used for heavier loads with specific shot |
| 1 5/8 | 44.33 | Maximum charges should be determined with caution |
| 1 3/4 | 47.66 | Approach maximum charges with extreme caution |
| 2 | 54.68 | Generally above maximum for many 20 gauge loads |
Important Note: This chart is for informational purposes only. It's a simplified representation and might not cover all possible powder charges. Never rely solely on this chart for reloading.
Safety Precautions When Reloading 20 Gauge Ammunition
Reloading ammunition is inherently dangerous if not approached with caution and precision. Here are some essential safety tips:
-
Always consult your powder manufacturer's loading data: This is the most crucial step to ensure safe and consistent loads. The data provided by the manufacturer is specifically tested for your chosen powder and components.
-
Use a reliable scale: An accurate scale capable of measuring in grains is essential for precise powder measurement. Even small discrepancies can result in unsafe pressure levels.
-
Proper case preparation: Ensure your cases are clean, sized, and primed correctly. Damaged cases can lead to malfunctions and dangerous pressure buildup.
-
Wear safety glasses and ear protection: This protects your eyes and hearing from potential hazards during the reloading process.
-
Work in a clean, well-ventilated area: Powder is flammable, and good ventilation prevents the buildup of potentially hazardous dust.
-
Store ammunition properly: Store your reloaded ammunition in a cool, dry place, away from children and pets.
-
Regularly inspect your equipment: Ensure your reloading press and other equipment are in good working order. Faulty equipment can lead to unsafe loads or dangerous malfunctions.
Case Study: Understanding Load Data
Let's say you're using a powder that recommends a 1 1/4 dram charge in your 20 gauge shells. Referring to the chart, this translates to approximately 34.17 grains. However, you must check the specific load data from your powder manufacturer for the exact grain weight recommendation with that specific powder, your chosen shot weight and hull. They may have slight variations. Never assume any conversion is perfectly accurate.
Conclusion: The Importance of Precision in Reloading
The 20 gauge dram equivalent chart provides a general conversion, but it is not a substitute for the precise loading data provided by powder manufacturers. Accuracy and safety are paramount in reloading, and meticulous attention to detail is essential to prevent dangerous situations. Always prioritize safety and consult official sources before attempting to reload ammunition. Improperly loaded ammunition can result in serious injury or damage.