Is 38mm Subsonic Ammo a Thing? Understanding Subsonic Ammunition Calibers
The question of whether 38mm subsonic ammo exists hinges on clarifying what "38mm" refers to. There isn't a widely recognized commercially available firearm cartridge using the designation "38mm." This measurement likely refers to one of the following, each with different implications for subsonic capabilities:
1. Misunderstanding of Cartridge Designation: The most probable explanation is a misunderstanding or misremembering of a cartridge designation. Common calibers often confused with a "38mm" might include:
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.38 Special/.38 Long Colt: These are common revolver cartridges. Subsonic ammunition is readily available for both. The key is to look for ammunition specifically labeled "subsonic" or with a low-grain bullet weight. Heavier bullets generally travel slower and are more likely to be subsonic.
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.38 Super: This semi-automatic pistol cartridge also has commercially available subsonic options, though they may be less common than for .38 Special. Again, look for low-grain bullet weights.
2. Other Less Common Calibers or Non-Standard Rounds: There might be less common or specialized calibers that use a metric measurement approximating 38mm. These would likely be found in specialized or less common firearms and are much less likely to have subsonic ammunition readily available.
3. Possible Confusion with a Different Measurement System: The use of "mm" might reflect a metric measurement of a projectile (bullet) diameter. However, the proper way to specify a cartridge is to use the established designation (e.g., .38 Special, 9mm Luger, .45 ACP). Mixing metric and non-metric specifications can be very confusing.
Understanding Subsonic Ammunition:
Subsonic ammunition is designed to travel slower than the speed of sound (approximately 1125 feet per second or 343 meters per second). This is beneficial for several reasons:
- Reduced Noise: The characteristic "crack" of a supersonic bullet breaking the sound barrier is significantly reduced or eliminated.
- Increased Accuracy at Longer Ranges: Supersonic bullets can experience instability due to the shockwave they generate. Subsonic rounds often offer improved accuracy at longer distances.
- Specific Applications: Subsonic ammunition is particularly valuable for hunting or tactical situations where noise reduction is critical.
Finding Subsonic Ammunition:
To find subsonic ammunition for a specific caliber, you should:
- Clearly Identify Your Cartridge: Be absolutely certain of the correct and complete cartridge designation for your firearm.
- Check Reputable Ammunition Suppliers: Visit well-known and trusted ammunition retailers. The product description will clearly indicate whether the ammunition is subsonic.
- Look for Specific Bullet Weight Information: Generally, heavier bullets of a given caliber are more likely to be subsonic.
In short, while a "38mm" designation isn't standard, the concept of subsonic ammunition is well-established. If you can clarify the actual cartridge you're working with, finding appropriate subsonic rounds should be straightforward. Remember to always consult your firearm's manual to ensure you use the correct ammunition type.
