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Personal Defense Ammo

Effective home defensive ammunition involves a delicate balance between bullet penetration and expansion. If the bullet goes through the attacker or misses its intended target and strikes an interior or exterior wall, the bullet expansion should greatly reduce the changes of effective over penetration through an interior or exterior wall into an adjacent room or through and exterior wall and into an adjacent house. Bullet expansion creates two effects; it makes a larger frontal contact surface which reduces continued penetration depth, and it reduces bullet velocity. The best home defense ammunition should maximize these effects.

Effective personal defensive ammunition involves another delicate balance between penetration and expansion. The bullet must penetrate deep enough to damage major internal organs without penetrating through an attacker and penetrate the thickness of a human skull for 100% stoppage of a threat. The bullet must also expand enough to increase internal damage, but it cannot expand so much as to prevent penetration into major internal organs or through a human skull or over penetrate and go through the attacker’s body or skull.

Up to now, our personal testing has proven the “Flex-Tip” bullet design provides an effective balance between penetration and expansion. These results indicate the bullet should penetrate deep enough to damage major internal organs without penetrating through an attacker as well as penetrate the human skull, and at the same time, it provides ensured expansion when fired through leather or heavy clothing. Its ensured expansion makes a larger frontal contact surface which reduces continued penetration depth, and it reduces bullet velocity. These effects should reduce over penetration through walls.

However, a new bullet design has come to our attention. It is the “Guard Dog” cartridge make by “Federal” ammunition manufacturer. The design and properties of the “Guard Dog” cartridge could be more effective, when it comes to lethal body and skull penetration and at the same time reduced interior/exterior wall over penetration.

USE: Home Personal Defense
CALIBERS: 9mm, .40 & 45 ACP
CALIBER TESTED: 9mm
CALIBER VELOCITY: 1230 fps
CARTRIDGE CONSTRUCTION: According to an article titled: Federal Guard Dog, Few things are as comforting as a dependable guard dog by Richard Mann (Rss), March 16, 2012.

“The bullets used in Guard Dog ammunition were conceptualized in the early 1980s by Tom Burczynski, but were not introduced by Federal until about the turn of the century. They’re called EFMJ (Expanding Full Metal Jacket) or CSP (Captive Soft Point) bullets…The EFMJ bullet consists of a gilding-metal jacket surrounding a lead core located at the rear of the bullet. The open (rear) end of the jacket is crimped over the rear of the lead core, just like in a hardball round. The real difference is at the front of the bullet, where there is a void between the front of the lead core and the nose of the jacket.”

“This void is filled with a rubber ball Federal calls an internal polymer. The nose of the bullet is scored along its sides, surrounding the ball. When the bullet impacts something, the scores in the jacket separate, and the flat nose of the bullet compresses the ball. In a way, it’s kind of like squashing an empty soda can, except a soda can collapses on itself. With the EFMJ bullet, the rubber ball forces the jacket material outward to create a wide frontal diameter.”

REVIEW QUESTIONS

1. “Does the “Guard Dog” cartridge outperform the “Flex Tip” cartridge, when it comes to bullet expansion and reduced penetration through interior/exterior walls?”

2. “Does the “Guard Dog” cartridge outperform the “Flex Tip” cartridge, when it comes to penetration deep enough to damage major internal organs without penetrating through an attacker and penetrate the thickness of a human skull for 100% stoppage of a threat?

REVIEW TEST PROCESS

Shooting a 9mm (105 grain) cartridge out of a tactical 9mm AR with a 16” barrel. This will be a side by side bullet expansion and penetration test using standard “Full Metal Jacket” (“FMJ”) (115 grain), “Critical Duty”, “Flex Tip” Jacketed Hollow-point” (“JHP”) (135 grain), “Critical Defense”, “Flex Tip” Jacketed Hollow-point” (“JHP”), and “Guard Dog”, (“EFMJ” or “CSP”) (105 grain). This test will fire these four (4) bullet designs through a simulated residential building exterior wall made of standard thickness drywall, 1/4″ thick standard particle board, standard vinyl siding and into four (4) Springfield, MO area telephone books.

TEST RESULTS

“FMJ” = There were no visible signs of expansion and penetration through 1st phone book approximately 541 pages thick; through 2nd phone book approximately 683 pages thick; through the 3rd phone book approximately 776 pages thick’ and stopped in 4th phone book after approximately 591 pages. (See photos)

“Critical Duty”, “Flex Tip” Jacketed Hollow-point” (“JHP”) = There was extensive uniform expansion, and it penetrated through 1st phone book approximately 541 pages thick; through 2nd phone book approximately 683 pages thick; and stopped in 3rd phone book after approximately 407 pages. (See photos)

“Critical Defense”, “Flex Tip” Jacketed Hollow-point” (“JHP”) = There was extensive expansion; however, the bullet separated from the metal jacket at the base of the bullet, and it penetrated through 1st phone book approximately 541 pages thick; through 2nd phone book approximately 683 pages thick; and stopped in 3rd phone book after approximately 141 pages. (See photos)

“Guard Dog”, (“EFMJ” or “CSP”) = = There was extensive uniform expansion; and it penetrated through 1st phone book approximately 541 pages thick, and it stopped in 2nd phone book after approximately 163 pages. (See photos)

REVIEW ANSWERS

1. Yes, the “Guard Dog” cartridge outperforms the “Flex Tip” cartridge, when it comes to bullet expansion and reduced penetration through interior/exterior walls. The bullet design appears to have caused the bullet to begin expanding when it struck the drywall material of the simulated residential wall.

2. Yes, the “Guard Dog” cartridge appears to outperform the “Flex Tip” cartridge, when it comes to penetration deep enough to damage major internal organs without penetrating through an attacker and penetrate the thickness of a human skull for 100% stoppage of a threat.

REVIEW CONCLUSIONS

No bullet design or makeup can eliminate body/skull or interior/exterior wall over penetration; however, bullet design and makeup can go a long way towards reducing these over penetration concerns. The best home and personal defense cartridge should incorporate the best currently available bullet design and makeup specifically focused on lethal body and skull penetration and at the same time reduced interior/exterior wall over penetration.

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Phone: (636) 259-0267
Email: matt@mattcanovi.com
3711 West FR 14
Brighton MO 65617