Even a thin-jacketed traditional match bullet won’t expand at subsonic velocities, it may tumble, but may act more like an FMJ until it becomes unstable. If you do use subsonic, make sure you know what that projectile is going to do at those slow speeds. When it comes to the 300 Blackout, there are more options for rapid expansion in supersonic rounds than there are with subsonic loads. In general, most people prefer a self-defense rifle bullet that expands rapidly and doesn’t over-penetrate so that bullets won’t travel through multiple walls or similar structures. Maybe a greater margin of error for nicking a vital organ as a result of larger bullet expansion.īuy Discreet Ballistics 188gr Selous 300BLK Subsonic.Reduced risk of over penetration from a pass through projectile.The only real advantages of an expanding subsonic over an expanding supersonic in a home defense situation are (in no particular order): In short a good expanding supersonic 300BLK is always ballistically superior to a good expanding subsonic 300BLK. Despite larger bullet expansion size the temporary and permanent wound cavities of expanding subsonics are typically much smaller than expanding supersonics. Expanding subsonic bullets have almost twice the material to work with which allows them to expand much larger than lighter expanding supersonic bullets – sometimes as much as three times original bullet diameter with machined solid copper. Conversely an expanding supersonic bullet will create substantially more trauma than non-expanding supersonic bullets or expanding subsonic bullets. A supersonic 300BLK round that does not deform or tumble in soft tissue will create only marginally more trauma that a heavier non-deforming non-tumbling subsonic bullet. But while energy transfer is very important it does not tell the entire story. ![]() Supersonic 300BLK can have nearly three times the kinetic energy as a subsonic 300BLK. 300BLK comes in two flavors: supersonic and subsonic. 300BLK is the most versatile centerfire cartridge in existence and an excellent HD choice. If you’ve chosen 300BLK to help accomplish this goal, you’re on the right track. Home defense in its most typical form is about getting yourself and your loved ones off the X. – Brad Criner, Senior Director – Sig Sauer Ammunition This will add versatility and a broader range of uses for this great platform. There’s a time and place for both technologies and you should practice/zero with both types. On the other hand, supersonic offerings, when combined with suppression, will still conceal one’s position and affords longer range lethality due to flatter shooting, lower weight bullets. Subsonic is also preferred where the hunter wants to limit the maximum range of projectiles. Heavy for caliber bullets are often used to off-set lack of velocity and still provide great short to medium range performance. ![]() The clear advantages of sub-sonic loads are, of course, sound suppression which can conceal both presence & position. ![]() 300BLK: Subsonic Or Supersonic Ammo To Defeat Threats?ģ00 BLK is known for subsonic performance but one cannot discount the great performance of supersonic offerings as well. I have a feeling I know how most of them will answer, but I’ve been wrong a few times in the past.Īnyway, read through the responses below and let us know your thoughts in the comments section. In a possible third part of the series, I’m considering asking a few hunters and invasive species control experts (wild hog eradicators) for their opinion. Instead of just yelling at the clouds, I thought we could bring in a few experts in the field of ammunition development and ask them for their thoughts on the matter. And a small percentage of you claimed that using a 300BLK AR15 in a life or death situation was nothing more than a mall ninja’s wet dream. Others chose faster and lighter rounds because “it’s a rifle, not a pistol”. Some of you stated that you would pick heavier and quieter rounds to preserve situational awareness and communication abilities. When we last left you, the discussion of choosing either subsonic or supersonic ammo for your 300BLK defensive weapon was in a full-on firefight.
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