Tag: caliber

Even within the same ammunition system, different projectile weights have a massive effect on external and terminal ballistics. Here we see some of the different weight bullets available in the 5.56x45mm caliber. Different bore diameters give rounds different properties. Despite the fact that all three rounds shown here - 7.62x39, 5.6x39 Russian, and 6.5x38 Grendel (two on the right) - all use the same case base and have virtually the same case capacity, they have very different ballistic properties due to their different bore and bullet diameter. Left to right: .280/30 British, 7.62x39mm M67, 5.56x45m M855, 6.8x43mm SPC XM68GD, 6.5x38mm Grendel 123gr Lapua Scenar, 7.92x33mm Kz.Ptr.43 sME. All of these rounds have different characteristics that affect their ballistic performance and their reliability in automatic firearms. We'll be taking a closer look at these characteristics to better understand the trade-offs in small arms ammunition design. 7.65x35mmMAS Four PDW calibers: .22 WMR (Kel-Tec CMR-30 and PMR-30 SMG), .22 SCAMP (Colt SCAMP), 5.7x28mm FN (FN P90), and 4.6x30mm HK (HK MP7).

Modern Personal Defense Weapon Calibers 002: The 4.6x30mm HK

If the 5.7x28mm FN is the first successful modern PDW round, then the 4.6x30mm HK is the second, and its biggest rival. German firm Heckler and developed the microcaliber 4.6mm in the 1990s as a response to a NATO solicitation for a Personal Defense Weapon, to which [Read More…]

Four PDW calibers: .22 WMR (Kel-Tec CMR-30 and PMR-30 SMG), .22 SCAMP (Colt SCAMP), 5.7x28mm FN (FN P90), and 4.6x30mm HK (HK MP7).

Modern Personal Defense Weapon Calibers 001: Introduction, and the 5.7x28mm FN

At this point, we’ve talked about 25 different intermediate and full power calibers as part of a series comparing different types of modern small arms ammunition. However, one subject not yet thoroughly covered is rounds for personal defense weapons (PDWs). These [Read More…]

Left to right: 7.65x38mm Swiss, 7.5x55 GP.11, 6.45x48mm GP.80, 5.56x45mm SS109 0919161710cmod2 gerrperrscherr

Where to Draw the Line? Managing the Weight of Next Generation Universal Calibers Using a Weight Calculator

How can one balance the trade-offs inherent in ammunition design to create a true one-caliber infantry weapon system that is both effective and lightweight? This is a question I’ve been exploring for close to a decade, and writing about for over four years. The [Read More…]

.264 USA .30 caliber rounds: .30-06 M2 AP, .303 Mk. VII, 7.5x54 Balle C, 7.9x57 sS Patrone, 7.62x54R LPS Ball, 7.62x51 NATO S Patrone (Austria). The 7.92mm Kurzpatrone 43 (middle right) was developed from the larger 7.92mm German infantry cartridge, represented by the 154gr S Patrone (left) and 198gr sS Patrone (middle left). The 7.92x33 Kurz, as it's more commonly called today, is still used by some forces that retain the WWII-era Sturmgewehrs that fire it. The primary producer of ammunition for these weapons today is Prvi Partizan, which made the cartridge on the far right. 5.8x42DBP-10 On the right are two types of 7.62 NATO round, the M80 and M80A1, alongside two of its predecessors. Center left is the .30 T104 ball cartridge using the 1948 T1E1 case. Left is the .300 Savage, which was the starting point for what became the 7.62 NATO. The 4.85 British (center) was developed in the UK and competed in the NATO trials that eventually standardized on the Belgian 5.56mm SS109 load (left). Like the similar German 4.9x45mm DAG (right), it is based on the 5.56mm case. The 5.56mm alongside two of its .17 caliber variants. Center, the 4.32x45mm Frankford Arsenal, Right, the German 4.3x45mm DAG. Two .280/30 cartridges, and their immediate ancestors. The .280 concept was inspired by the German 7.92x33 Kurz caliber on the far left, but demands for standardization in testing with the US-developed .30 T65 cartridge (center left) resulted in rounds after 1949 using the same case head as that round. 0810162235bn On the right are the two major iterations of the 6mm SAW, the 45mm steel cased version, and the 50mm aluminum cased version. In the middle is a modified .25 Winchester experimental round used for ballistic testing in the early part of the SAW program. On the far left is 5.56mm M855, which became the eventual chambering for the resulting M249 SAW. The 6x35mm KAC/TSWG flanked by its parent, the .221 Remington Fireball on the left, and the 5.56x45mm on the right, which it is designed to duplicate from shorter barrel lengths. A 5.45x39mm 7N6 cartridge, flanked by two of its predecessors. The 5.6x39mm (left) was developed from an early Soviet ballistic test round using the 7.62x39mm case head, which was designed to duplicate the performance of the early .222 Remington Special (right), later renamed the .223 Remington. The .25-45 Sharps flanked by the 5.56mm M855 and Mk. 262 rounds. 7.62x40 WT next to its parent, the 5.56mm. On the right are two .300 AAC Blackout rounds, alongside the green-tipped 5.56mm and shorter .221 Remington Fireball that serves as the round's parent case. Two 6.5 Grendel rounds and related cartridges. Left to right: 7.62x39mm, .220 Russian, 6.5 Grendel 123gr SMK, Wolf 100gr FMJ. Three 6.8 SPC cartridges and their parent round. Left to right: .30 Remington, 6.8 SPC 115gr Sierra BTHP, 110gr Hornady OTM, XM68GD 90gr soft point. 7.62x39 and two of its derivatives. Left to right: Commercial FMJ, Yugoslavian M67, 5.6x39mm/.220 Russian, 6.5x38 Grendel. Various 5.56mm rounds, left to right: 55gr M193, 55gr French ball, M855 (made in Korea), Mk. 262 Mod. 1, Mk. 318, M855A1 ammo1

Hunting Tips (from a girl): Is there such a thing as a do-it-all round?

One of the common questions seen in hunting groups on social media is some variation on asking what caliber is best for X animal. It pops up everywhere and instantly results in dozens of opinions, all backed by the commenter’s claim of extensive knowledge and [Read More…]

That is what happens when a wound channel collapses on itself so quickly that it sets the air on fire. Those of you who guessed "more than $2" are correct. .30 caliber rounds: .30-06 M2 AP, .303 Mk. VII, 7.5x54 Balle C, 7.9x57 sS Patrone, 7.62x54R LPS Ball, 7.62x51 NATO S Patrone (Austria). PHOTO_20160514_221357 PHOTO_20160514_213429 QGW1ekj PHOTO_20160427_224237 0831150951c22 gerrperrscherr

Caliber Configuration Podcast with Yours Truly at Gun Guy Radio

Back in March, I wrote a post on caliber configuration, or the effort to create and standardize effective and economical ammunition for infantry small arms. As mentioned in the post itself, it was written as a more in-depth companion article for a podcast recorded by [Read More…]

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