9mm vs 10mm BulletsĪ lot of factors go into how ammunition performs, one of those factors is bullet weight. This brings us to the actual cartridges themselves. This led to 10mm becoming slightly obscure until the early 2000s. However, despite the FBI adopting 10mm, many law enforcement agencies decided to keep 9mm as their standard round or adopt. This led to the development of the 10mm FBI load or 10mm Lite, a loading that reduced the powder charge of the basic 10mm round. However, once it was adopted, the FBI found that many of their regular agents could not handle the heavier recoil of 10mm and the increased size of gun it required. This led to the selection of 10mm as the preferred FBI round. Multiple tests were run to determine which rounds could meet the penetration levels of their current issue. This caused the FBI to re-evaluate its ammunition. It was later determined that the gunfight would have ended sooner if one of the 9mm bullets had penetrated a mere 1 inch deeper to reach the heart of one of the gunmen. The firefight resulted in both suspect’s deaths and the deaths of two FBI agents. While we won’t go over the entire shootout, it did feature two suspects armed with a Mini-14, a shotgun, and revolvers against eight FBI agents armed mostly with 9mm handguns, revolvers chambered in. This conflict culminated after one of the most influential incidents in law enforcement history: the 1986 FBI Miami Shootout. This brings us back to the conflict between 9mm and 10mm in the 1980s. 45 ACP loadings and magnum loads for revolvers.Īll of this happened within the time frame of 1979 to 1983 from the concept of both the pistol and the round being developed to the actual release of both. 40 caliber projectile being pushed somewhere at or above 1000 feet per second (fps). Under Cooper’s advice, the new round was a. That way you could have the benefits of quicker reloading and capacity provided by modern semi-automatic designs with power exceeding both. The reason this gun was being developed was to produce a similar performance to a magnum revolver load in a semi-automatic. The round was developed for a CZ 75 variant known as the Bren Ten. The 10mm cartridge is not the product of one individual but from the combined efforts of Thomas Dornaus, Michael Dixon, Jeff Cooper, and the ammunition manufacturer Norma AB. We’ll get to that shortly but we have to know how 10mm developed. It was at this time that the round came into conflict with 10mm on a national scale. This started occurring roughly around the 1980s, especially with more designs being developed and adopted by military, civilian, and law enforcement end-users. This was a significant improvement over the 7 to 10 round capacities of guns chambered in. The 9mm cartridge allowed for the development of the “Wonder Nines.” These were pistols that offered higher capacities of 15 or more rounds to a magazine. It saw adoption by many countries before and through the World Wars, resulting in many designs being developed to make the most out of the round. It wasn’t too weak, but it was of a smaller diameter than many military cartridges at the time. When compared to other popular rounds of the time it provided better recoil and acceptable effectiveness. The 9mm cartridge was developed in the early 1900s by Georg Luger for his pistol design. So let’s look at the origins of both 9mm and 10mm. This allows us to see the methodology behind each which helps us select the right ammunition for our needs. 9mm vs 10mm: The Complete Side-by-Side Comparisonīefore we get into the stats of each of these rounds we need to understand where they came from and why they were developed. 10mm to see what these two options bring to the table and why they should be considered by you. There are a lot of ammunition options on the market today, some of them are very similar while others are very different.įor handguns, the options narrow quite a bit but this still leaves the questions of which is better for self-defense, what is better overall, and why are they different?
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