Slowpoke_Rodrigo
New member
Following is a synopsis of an article by Corporal Ed Sanow in the June 2000 issue of Gun World magazine.
Federal Cartridge and Experimental Research (Tom Burczynski) have jointly developed a new handgun bullet, the Expanding Full Metal Jacket (EFMJ). Burczynski previously patented the Hydra-Shok, Starfire and Quik-Shok bullet designs, and has now patented the EFMJ.
The EFMJ is a dual-core design. The front core is silicone rubber; the rear core is antimonial lead. The jacket is a gilding metal FMJ flat point design that is scored where it covers the front core.
The EFMJ is designed to expand, or bulge, by frontal impact. The flat point is pushed back, deforming the silicone front core. The sides of the bullet bulge outward until the jacket splits where it is scored. The silicone core 'pancakes' within the collapsed, scored front jacket. Note that the jacket deformation, not the core, determines the final diameter of the bullet.
Advantages claimed for the EFMJ are:
<UL TYPE=SQUARE>
<LI>feed reliability superior to JHP
<LI>resistance to overpenetration superior to conventional FMJ
<LI>expansion mechanism does not rely on internal hydraulic pressure acting on a HP cavity, thus clothing or intervening barriers do not defeat the expansion mechanism
<LI>wider 'operating window' than JHP, thus the EFMJ expands and penetrates similarly in carbines and handguns
</UL>
Much more information, and several photographs and charts, can be found in the Gun World 6+ page article. There is no information at www.federalcartridge.com.
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Slowpoke Rodrigo...he pack a gon...
I voted for the Neal Knox 13
I'll see you at the TFL End Of Summer Meet!
[This message has been edited by Slowpoke_Rodrigo (edited May 11, 2000).]
Federal Cartridge and Experimental Research (Tom Burczynski) have jointly developed a new handgun bullet, the Expanding Full Metal Jacket (EFMJ). Burczynski previously patented the Hydra-Shok, Starfire and Quik-Shok bullet designs, and has now patented the EFMJ.
The EFMJ is a dual-core design. The front core is silicone rubber; the rear core is antimonial lead. The jacket is a gilding metal FMJ flat point design that is scored where it covers the front core.
The EFMJ is designed to expand, or bulge, by frontal impact. The flat point is pushed back, deforming the silicone front core. The sides of the bullet bulge outward until the jacket splits where it is scored. The silicone core 'pancakes' within the collapsed, scored front jacket. Note that the jacket deformation, not the core, determines the final diameter of the bullet.
Advantages claimed for the EFMJ are:
<UL TYPE=SQUARE>
<LI>feed reliability superior to JHP
<LI>resistance to overpenetration superior to conventional FMJ
<LI>expansion mechanism does not rely on internal hydraulic pressure acting on a HP cavity, thus clothing or intervening barriers do not defeat the expansion mechanism
<LI>wider 'operating window' than JHP, thus the EFMJ expands and penetrates similarly in carbines and handguns
</UL>
Much more information, and several photographs and charts, can be found in the Gun World 6+ page article. There is no information at www.federalcartridge.com.
------------------
Slowpoke Rodrigo...he pack a gon...
I voted for the Neal Knox 13
I'll see you at the TFL End Of Summer Meet!
[This message has been edited by Slowpoke_Rodrigo (edited May 11, 2000).]
