Underwood .45 ACP +P 135gr Lehigh Xtreme Defender Ammunition /20

Underwood .45 ACP +P 135gr Lehigh Xtreme Defender Ammunition /20

While taking advantage of state of the art testing equipment, this high performance ammunition by underwood is field tested using popular, real firearms that customers are most likely to own out in the real world with all the elements you would experience. If for some reason Underwood Ammunition fails to meet performance expectations, Underwood stands by their product 100% and will make sure the customer is satisfied with every purchase. This ammunition is new production, non-corrosive, in boxer primed, reloadable nickel plated brass cases. 

The Underwood nickel plating process provides several key benefits including; improved feeding in all actions of firearms, enhanced corrosion resistance over traditional brass, improved cosmetics, and ease of cleanup during reloading. Nickel plated casings will not tarnish like brass during storage or when in contact with foreign materials such as leather, moisture, and other metals. Until the development of the Ducta-Bright 7a process, nickel plating casings often limited the number of reloads as compared to raw brass. It was claimed that nickel plated brass casings embrittled the brass therefor making it less desirable for reloaders despite the ease of cleanup that nickel plating offers. In addition, ammunition engineers raising concerns of using nickel plating in very hot +P or magnum loads found that traditional nickel plating often cracked deep-drawn cases, or worse, lead to a total failure. This new process eliminates any concern, to the shooter or reloader, of hazard or ability to re-use the brass.

Specifications:
Manufacturer: Underwood
Caliber: .45 ACP +P
Weight: 135gr
Type: Lehigh Lead-Free Ammunition
MPN: 844
Rounds Per Box: 20

Features:
- Lead Free: Yes
- Case Type: Nickel Plated
- Primer: Boxer
- Corrosive: No
- Reloadable: Yes

About the Brand Name:
The Xtreme Defender is based on the popular Xtreme Penetrator product line. The XD ammunition has an optimized nose flute, total weight, and velocity to achieve a penetration depth up to 18 inches with a permanent wound cavity (PWC) that is just simply enormous; no other expanding hollow point comes close to achieving anywhere near this diameter and volume. Not only is the PWC over 100% larger than any other expanding bullet, expansion is achieved despite being shot through barriers. The solid copper body ensures that wallboard, sheet metal, and automotive glass will have no effect on the Permanent Wound Channel. All of Underwood Ammo rounds utilize flash suppressed powder so that your vision will not be compromised if it becomes necessary to use your firearm in low light.

About the 45 ACP Cartridge
The .45 ACP(11.43x23mm or Automatic Colt Pistol), also known as the .45 Auto by C.I.P. or 45 Auto by SAAMI, is a cartridge designed by John Browning in 1904, for use in his prototype Colt semi-automatic .45 pistol and eventually the M1911 pistol adopted by the United States Army in 1911.

The U.S. Cavalry had been buying and testing various handguns in the late 1890s and early 20th century. The .45 Colt Single Action Army (SAA) had largely been replaced, even by some double-action versions of the same. The Army had fielded some double-action revolvers in .38 Long Colt. They determined the .38 caliber round was significantly less effective than the .45 Colt against determined opponents such as the warriors encountered in the Moro Rebellion of the Philippine American War. The then-current issue rifle, the .30-40 Krag, had also failed to stop Moro warriors effectively;[3] the British had similar issues switching to the .303 British, which resulted in the development of the dum-dum bullet. This experience, and the Thompson LaGarde Tests of 1904 led the Army and the Cavalry, to decide a minimum of .45 caliber was required in the new handgun. Thompson and Major Louis Anatole La Garde of the Medical Corps arranged tests on cadavers and animal remains in the Chicago stockyards, resulting in the finding that .45 was the most effective pistol cartridge. They noted, however, training was critical to make sure a soldier could score a hit in a vulnerable part of the body.

45 ACP Cartridge Specifications
Case type Rimless, straight
Bullet diameter .451 in (11.5 mm)
Neck diameter .473 in (12.0 mm)
Base diameter .476 in (12.1 mm)
Rim diameter .480 in (12.2 mm)
Rim thickness .049 in (1.2 mm)
Case length .898 in (22.8 mm)
Overall length 1.275 in (32.4 mm)
Case capacity 25 gr H2O (1.6 cm3)
Rifling twist 1 in 16 in (406 mm)
Primer type Large or Small pistol
Maximum pressure 21,000 psi (140 MPa)

45 ACP Cartridge Ballistic Performance (5 inch Test Barrel
185 gr (12 g) Bonded Defense 1,225 ft/s (373 m/s) 616 ft-lbf (835 J)
185 gr (12 g) Speer Gold Dot JHP 1,050 ft/s (320 m/s) 453 ft-lbf (614 J)
200 gr (13 g) Speer Gold Dot JHP +P 1,080 ft/s (330 m/s) 518 ft-lbf (702 J)
230 gr (15 g) Federal Hydra-Shok 900 ft/s (270 m/s) 414 ft-lbf (561 J)
230 gr (15 g) US Army Ball FMJ 830 ft/s (250 m/s) 352 ft-lbf (477 J)