JD Jones pioneered much of field earlier with the 300 Whisper cartridge, which furthered the concept of a low-visibility use firearm with a cartridge specific to that purpose. The idea of a slow-moving, heavy round has been around since the 60's, and Soviet engineers adopted the concept early with the 7.62×39 round. The limited ability for Night Vision Goggles to clearly identify possible enemy combatants at distances beyond 300 meters, combined with the inherent increase in Close-Quarters Battle type engagements drove development to look at new cartridges that could combine the best of both pistol and rifle caliber cartridges. Their influence over the private industry demonstrated itself as short barreled rifles, suppressors, and eventually, night vision took the market by force, cascading into private interests on maximizing performance. The rise of Special Operations during the Global War on Terror increasingly focused on night capability. Multiple influences contributed to the origin of the 300 Blackout cartridge. From the 30,000-foot view, the first testimony to the merits of the cartridge begin at how well it has taken root in firearms culture. At the same time, the round has been compared to 5.56 NATO and 7.62×39 by both enthusiasts and professionals. The dates of its development coincide with the proliferation of AR-style firearms after the sunset of the Clinton Assault Weapons Ban resulting in the quick adoption by hunters, reloaders, and manufacturers, as well as those concerned with self-defense. Unlike other gauges, ours includes the throat and bore, so that when you check the loaded ammunition, you are checking the complete round, not just the case.The intermediate cartridge known as 300 Blackout or 300 AAC Blackout carries with it a bit of mystery and a short history of rapid acceptance across various shooting traditions. The length of the gauge corresponds to the max length of the cartridge.Īny rounds that fit the gauge will chamber. The diameter of the gauge is SAAMI min chamber spec, which is larger than the max spec of the cartridge. These gauges have steps on the face to correspond to the cartridge spec minimum brass headspace measurement, and the minimum and maximum chamber length. Use as a go/no go gauge to check the ammo headspace measurements against SAAMI min/max. Use as a chamber checker to ensure that all of your rounds will work in any of your firearms. They can be used to catch several common issues with reloading 300BLK, including issues with thick necks. These gauges can help you both troubleshoot and improve your reloads and purchased ammunition. And see the interface between your ammo and a chamber that you would never otherwise see. By taking an ammunition gauge and opening up a window into it, you can now actually see the shoulder, and how everything seats into the chamber. SLOTTED GAUGES are an improvement of existing ammunition gauge design. These gauges are designed primarily for use where the brass is always full length resized. This allows you to check brass sizing, headspace, bullet seating, and crimping all with one gauge. The gauge is machined to the SAAMI minimum chamber spec for the 300BLK caliber. AMMUNITION GAUGES are uniquely designed to check loaded ammunition, giving you the ability to check your factory ammunition or reloads against a spec chamber.
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