This isn't 6.5 Grendel specific, and probably wouldn't work withing the cartridge overall length limits for the 6.5 grendel in AR15 magazines, but both the Spanish and Americans achieved promising results in terms of external ballistics versus recoil wile experimenting with long light bullets. I'd like to know what Tony Williams and others here think of this idea. Was it an evolutionary dead end? Or might we still see some variation of this idea implemented?
I found this paragraph related to the 7.92x40 CETME round on Tony's website:
"One cartridge worth its own paragraph was the Spanish 7.92x40 CETME Model 53. The ammunition was designed by Dr Gunther Voss, a German ballistician working for CETME. He wanted to combine a good long-range performance with light recoil, which he achieved by using a 6.9 g (106.5 grain) bullet made from solid aluminium alloy except for the copper sleeve around most of its length, which compensated for its light weight by being highly streamlined. As a result, it achieved a ballistic performance comparable with the 7.62x51 (MV was 800 m/s from a carbine-length barrel of 435mm) with a significant reduction in ammunition weight and an even bigger reduction in recoil."
Tony also mentions it at http://www.dtic.mil/ndia/2015/smalla...1_Williams.pdf.
There's an interesting document on the US FABRL round at http://www.dtic.mil/dtic/tr/fulltext/u2/765459.pdf.
"The FABRL concept could result in a considerably lighter system while still maintaining the same muzzle velocity and trajectory as the M193 ball bullet. The required chamber pressure of 39, 500 psi could enhance the feasibility of utilizing lightweight case materials for a future system. Even if a brass case was required for the FABRL cartridge, overall cartridge weight should be reduced by approximately 30 percent from that of the 5. 56 mm M193 cartridge."
I found this paragraph related to the 7.92x40 CETME round on Tony's website:
"One cartridge worth its own paragraph was the Spanish 7.92x40 CETME Model 53. The ammunition was designed by Dr Gunther Voss, a German ballistician working for CETME. He wanted to combine a good long-range performance with light recoil, which he achieved by using a 6.9 g (106.5 grain) bullet made from solid aluminium alloy except for the copper sleeve around most of its length, which compensated for its light weight by being highly streamlined. As a result, it achieved a ballistic performance comparable with the 7.62x51 (MV was 800 m/s from a carbine-length barrel of 435mm) with a significant reduction in ammunition weight and an even bigger reduction in recoil."
Tony also mentions it at http://www.dtic.mil/ndia/2015/smalla...1_Williams.pdf.
There's an interesting document on the US FABRL round at http://www.dtic.mil/dtic/tr/fulltext/u2/765459.pdf.
"The FABRL concept could result in a considerably lighter system while still maintaining the same muzzle velocity and trajectory as the M193 ball bullet. The required chamber pressure of 39, 500 psi could enhance the feasibility of utilizing lightweight case materials for a future system. Even if a brass case was required for the FABRL cartridge, overall cartridge weight should be reduced by approximately 30 percent from that of the 5. 56 mm M193 cartridge."
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