Archive for the 'Ammunition' Category

Whew!

Hmm … I have three comments.

First, I’m very impressed with the expansion of the Buffalo Bore PD ammunition.

Second, I’m not sure I’d claim that Buffalo Bore didn’t use +P brass on this round until they confirm that.

Third, as for the so-called “Glock Smile” (a term which I’ve never heard before), I’ve shot Buffalo Bore ammunition as well as Double Tap ammunition in 1911s and never seen this before, including with 450 SMC (Short Magnum Cartridges, super hot .45 ACP cartridges from Double Tap with a rifle primer versus a pistol primer), rated at 1120 FPS for a 230 gr. bullet.  I’ve Never seen it before.  Maybe it’s called “Glock Smile” because of the way it seats in the chamber?

I don’t know.  I don’t do Glocks.

In previous posts we’ve discussed barrel twist and stabilization of heavier 5.56mm rounds.  I’d say that 1:9 twist is just fine for 77 grain bullets based on his results.  Then again, Rock River Arms makes good machines.

Shooting Illustrated.

As the velocities of metallic cartridges increased and as rifle cartridges become significantly more powerful than handgun cartridges, things begin to change. If a shooter wanted a rifle, they generally wanted a rifle cartridge that would drastically extend the reach and hit harder than a handgun. Still, some revolver cartridges continued to be popular in rifles. With modern munitions, however, a popular revolver cartridge like the .357 Mag.—delivering about 1,200 to 1,400 fps out of a 4-inch revolver—will push the same bullet as much as 400 fps or faster out of a 16- or 18-inch-barrel rifle.

This created a problem for bullets. Modern projectile technology would allow ballistic engineers to create a bullet for .357 Mag. that could perform quite well at handgun or rifle velocities. What was challenging was to create something that would deliver expansion, maintain its weight and deliver decent penetration when fired from a short-barreled handgun as well as a rifle. You see, velocity is the driving force behind terminal performance, and bullets are typically designed to work within a certain velocity range. Extending that performance range so acceptable terminal performance can be had at impact velocities as low as 1,000 fps and as high as 1,800 fps has, at least until now, been similar to the search for Bigfoot.

I found myself trying to solve this conundrum of ammunition selection when I began working with a Ruger 77/357 bolt-action rifle I wanted to set up as a general-purpose rifle and as my companion to a concealed-carry and a general-purpose revolver.

[ … ]

Out of a snubnose revolver, the HammerDown load penetrated 15.5 inches and deformed with a frontal diameter 1.5X caliber. Out of the 4-inch revolver, the bullet penetrated 20 inches and across the front it measured 1.6X the unfired bullet diameter. And, out of the 18-inch barrel of the rifle, the 170-grain bonded bullet pushed to 22 inches and had a recovered frontal diameter that measuring 1.3X its original diameter. Unlike Critical Duty, which only showed a 400 fps (38 percent) velocity increase between the 2- and 18-inch barrels, the HammerDown load jumped from 1,102 fps out of the snubby to 1,773 fps out of the rifle, a 61-percent increase in velocity.

The point of all this is that if you’re a fan of the .357 Mag., and if you would like a single load suitable for hunting, predator defense and personal protection—a general-purpose or Bigfoot-capable load—you now have a fantastic option.

Left unmentioned are two things.  The first may be just an editorial preference, and that is that the ammunition design also incorporates certain features like chamfering at key parts of the cartridge to reduce misfeeds.

The second is the important one.  This is a designer, boutique ammunition, and the difficulty at the moment is finding ammunition at all.

Finally, just try to located a Ruger 77/357 or for that matter a Ruger 77/44 today.  They’ve been discontinued.

Oh, so then look for a Henry X Model in 357 magnum or 44 magnum.  Nope.  Cannot be found either.

They didn’t get to it until the end, but use of a hollow point bullet also helps stability in flight.  Explaining that fully would probably require an experienced computational fluid dynamics (CFD) engineer and some serious parallel processing computational time.

Shooting Illustrated.

Once the ammunition is purchased, where and how it is stored will determine how long it will be viable for its intended use.

Heat and moisture are the two most prevalent enemies of ammunition, followed by chemical contamination.

Temperatures consistently in excess of 150 to 170 degrees Fahrenheit tend to affect the propellant in a negative manner. These temperatures can be reached in car trunks, metal buildings or other uninsulated enclosures subjected to direct sunlight—especially in the southern tiers of the United States.

Anytime ammunition is subjected to continuous exposure to moisture, corrosion is likely to occur, which degrades the performance or disables the usability of the cartridges all together.

Chemical contamination is sometimes the silent killer of ammunition. Although much of today’s quality ammunition is protected by sealant-treated primers and bullets during manufacture, exposure to penetrating oils or cleaning solvents will degrade the sealants over time, thereby neutralizing the priming compound, the propellant or both, rendering the cartridge useless.

Ammoniated solvents used for removing copper from a bore are detrimental to brass cartridge cases, even with minimal exposure. Since brass is 70 percent copper (with the remaining 30 percent being zinc), ammoniated solvents can create a dangerous condition causing the brass to crack without having been fired. This could cause a hazardous pressure release during firing due to the weakened condition of the brass case.

Ammunition storage can be as simple as storing it in a safe area similar in environment to the office within which you work or the home in which you live. Keeping the temperature and humidity levels similar to what is comfortable for you and the family is an easy way to stay well within the range suitable for ammunition storage.

Many individuals who purchase and store quantities of ammunition are served well by storing it in sealed, military-surplus ammunition containers. Kept in a climate controlled, secure location, away from unauthorized personnel, these containers will preserve the ammunition indefinitely.

The reason there is no expiration date on a box of currently manufactured ammunition is because, when stored properly, it is projected to have an unlimited life span.

As an aside, I personally have fired ammunition loaded more than 100 years ago with excellent results. Advancements in primers, powder, cases, projectiles as well as in storage containers and accessories have improved the reliability of ammunition to a point that, properly treated, there is no reason for concern for your ammunition’s longevity.

Use of a sealed container (like a safe) along with desiccant would also help.

I have a problem with his conclusions because of the large difference in sample sizes between persons shot with the .357 magnum and .44 magnum.