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Antecedentes de Mendel

In document Tesis Doctoral (página 70-76)

Capítulo 2. Análisis de la Genética Clásica y de la representación del

2.1. Antecedentes biológicos y filosóficos

2.1.1. Introducción biológica

2.1.1.1. Antecedentes de Mendel

TACTICAL TRAINING

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WHAT IS A TACTICAL LOAD?

There is no pat answer for this question.

Some tactical loads are loaded lighter than standard, some are heavier. Others perform a certain task better. You have to do the homework and understand the pluses and minuses of each loading. No load can com-pensate for poor marksmanship.

Some loads enhance control. Among the first tactical loads introduced were Reming-ton’s Magnum revolver loads, including a 240-grain/1,000-fps .44 Magnum load and a 125-grain/1,250-fps .357 Magnum load.

These were intended to give working cops a manageable but effective loading that was sensibly lighter than a true Magnum.

The Federal 165-grain HydraShok in .40 caliber was loaded to 180-grain velocity, thus giving less felt recoil.

Today, Buffalo Bore Ammunition offers tactical loads in .357 Magnum that allow those of us using carry-grade revolvers to control the handgun much more efficiently.

While slower and producing less energy, these tactical loads feature bullets designed to expand well at lower velocity. The Barnes X bullet used in these loads is ideally suited to the task.

Modern tactical handgun ammunition de-signed for 9mm, .40- and .45-caliber hand-guns utilizes a bonded core bullet. The lead core and the jacket are bonded together by design. This is in contrast to the older lead core and copper cup design. These bullets are intended to maintain their integrity when penetrating a variety of obstacles between the shooter and the target. Wallboard, sheet steel and auto glass are commonly encoun-tered obstacles.

Bullets such as Hornady Manufacturing's XTP were developed because of the failures of older generation projectiles to fully

pene-TACTICAL TRAINING SPRING 2015 79

■ Among the most heavily tested and effective new loads is the Hornady Crit-ical Duty. (Hor-nady)

trate intermediate obstacles and incapaci-tate subjects. Federal’s original Hy-draShok was toughened into one of the first tactical loadings. Federal also did im-portant work in producing a 55-grain .223 JSP with improved tactical penetration.

Winchester has designed several out-standing loads. The present Winchester PDX loading is a development that has seen wide use and the FBI adopted the Winchester 230-grain Bonded Core load.

The Hornady Critical Duty load is a devel-opment of the Critical Defense technol-ogy. The Critical Duty load meets stringent guidelines for penetration and expansion. With the major agencies re-porting up to half of their critical incidents involving felons behind cover, a loading with the ability to penetrate light cover is desirable. These agencies cannot plan for the average incident but must be pre-pared for the worst-case scenario.

Tactical loads provide the best product for public safety and threat engagement.

These loads are typically offered in 124-and 147-grain bullet weight in 9mm, al-though the Hornady Critical Duty is a 135-grain load. The .40-caliber loads are usually 180 grains and .45 ACP loads are usually 230 grains. However, the Speer 200-grain +P load has given good results in tactical testing, so has the Hornady 200-grain XTP. The Hornady 220-grain Flex Lock breaks 1,000 fps from a 5-inch barrel Colt 1911 and offers excellent per-formance.

When you look at the performance of these bonded core loads, you may realize you do not need this type of performance for home defense. A load that expands more quickly, which offers less penetra-tion, may be desirable. However, if you TT-1502-AMMO-MK.qxp 1/23/15 4:41 AM Page 79

80 TACTICAL TRAINING SPRING 2015

need this type of penetration, these loads stand tall. Other tactical loads are actually designed to limit penetration. A load close to a standard weight but which offers good accuracy and rapid fragmentation may be desirable in certain situations such as hostage rescue. The HPR Black-Ops is among these.

RIFLE LOADS

Most rifles dispose of more energy than is needed for personal defense. Rifles are also designed to be used at longer distances. As an example the military has noted that the 5.56mm NATO cartridge loses its lethality rapidly after about 125 yards or when veloc-ity trails off to less than 2,500 fps. This is sel-dom a problem with the AR-15 unless an SBR is used. However, the original 55-grain FMJ needed improvement.

Most of the 55-grain JSP bullets available when the AR-15 was first issued to police were designed for varmint hunting. Tactical penetration was deemed inadequate. Most of these loads were far more frangible than JHP pistol loads. Federal’s 55-grain Tactical Bonded Softpoint has seen wide use and given yeoman service with many agencies.

At one time, there was a misguided recom-mendation for the 40-grain loads in police service, based on fragmentation and public safety. These loads often disintegrate on light cover and intermediate objects, and cannot be trusted for service use.

Decades ago, Jeff Hoffman of Black Hills Ammunition offered a 60-grain JSP load for service use. There have been other develop-ments and today the 55-grain load remains popular, but the heavier-weight bullets are

Ammunition

also in use. As an example, Black Hills Am-munition offers both the 68-grain Heavy Match and the 69-grain Sierra Match King.

In the more-accurate class of rifles, these heavy bullets demonstrate excellent accu-racy. These match-grade-accurate loads are popular for their accuracy and depend-able function. Winchester offers the 69-grain JSP, a load that expands like a .30-caliber bullet and does not fragment.

There are popular choices that offer su-perior accuracy coupled with a rapidly fragmenting bullet. The Hornady V-Max line is one and the Winchester Ballistic Silver-tip another. These loads will solve most de-fensive problems without heavy

penetration.

Another class of load has been devel-oped. These are the 75–77-grain .223 loads. Designed to buck wind drift at 250–300 yards, these loads are often deployed by designated marksmen. The advantages of these loads are seen pri-marily at long range. One of these, the Black Hills Ammunition 77-grain OTM, is proven in service in the war against ter-ror. These loads have also proven effec-tive at close range. They are not strictly necessary at moderate range but offer superior penetration.

TACTICAL TRAINING

Some modern loads expand by impact rather than fluid dynamics. This is the Hornady Critical Defense. (Hornady)

HORNADY

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TACTICAL TRAINING SPRING 2015 81

SHOTGUNS

Tactical shotgun loads are reduced re-coil loads, both in buckshot and slug ver-sions. These loads do not have the total energy of full power or Magnum buckshot loads. The shot loads demonstrate a su-perior pattern.

At seven to 15 yards — ideal shotgun range — the Remington Managed Recoil load exhibits a tight pattern that is ideal for superior wound potential. Buckshot tends to travel in pairs and these loads provide excellent performance. The Managed Re-coil load from Remington is a No. 8 pellet load, rather than the typical No. 9 pellet

preferred for use inside of 25 yards.

They also hit hard at longer range. How-ever, the slower loads have more drop and less effect than full-power slugs past 50 yards.

If you are trying to turn the shotgun into a rifle, careful thought and range work should go into slug choices. The tactical slug is often very accurate and exhibits good wound potential. The full-power slug often fragments to an extent and offers even better wound potential.

OPTIONS ABOUND

Today, there are many excellent loads available. Let reliability be your guide.

Consider accuracy, penetration, expan-sion and the intended audience before settling on a choice. A number of loads will give excellent performance. The rest is up to you. TT

ABOUT THE AUTHOR:Robert “Bob” Campbell is a writer in the firearms, personal defense and outdoors field with more than 4,000 published articles, columns and reviews, and 10 books. Bob holds a degree in criminal justice and served as pa-trol sergeant, papa-trol lieutenant and other assignments. His work spans subjects as diverse as history, psychology, ballistics and police procedure. His primary qualifications are a keen interest in the shooting sports and a genuine interest in his fellow shooters. His personal interests include Joyce, the grandchildren and the Corvette.

load. This is another reason recoil is much lighter. The lower-velocity buckshot loads create a tight pattern.

A relatively new player is the Hornady Critical Defense line. This load has demon-strated a clean powder burn, a good tight pattern and excellent overall performance.

Tactical slugs should be carefully consid-ered. Many of us with law enforcement expe-rience have arrived after the fact in shotgun shootings. We prefer the effect of the solid slug. A full-power slug, however, produces significant recoil.

Loads that feature lighter recoil, such as Remington’s Managed Recoil Slugger, are

Federal Premium Ammunition

Tactical load se-lection is serious business — work-ing cops know this. (Hornady)

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In document Tesis Doctoral (página 70-76)

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