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According to Magnum Research, this cartridge offers about 25% higher muzzle velocities compared to the .44 Magnum. The advantage over the .44 Magnum in the muzzle energy department is even more significant – 45%. The company claims that “429 DE is the fastest 44 cal. pistol cartridge on the planet“. When fired from a 6” barrel, the .429 DE is capable of pushing the 210-grain and 240-grain projectiles at muzzle velocities of 1,750 fps and 1,625 fps respectively. read more about it here https://www.thefirearmblog.com/blog/2018/11/07/429-de-new-cartridge-for-desert-eagle-pistols/
Personally, I love the ballistics of this; it can be adapted to many other applications...
 

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It's just .44 trying to catch up with 10mm ;)
 
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the 44 went way past the 40 anything when Elgin Gates magnumized the 44 magnum in the 70's.

I'd have to run my 445 over the chrono again [with a light for caliber 200gr bullet to make things equal to the 40] to recall the velocity numbers.
but I can assure you even the 38-40 in a lever gun struggles mightily to keep up.
neither the 10mm nor the 40 cal BP case will burn 35-40grs of fast rifle powders efficiently like the 445 will.

you might as well use the 38 super if all you want is speed.
 

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I love the 10 mm auto pistol caliber but after recently shooting my 10mm & .44 mag the same range trip, the 10 mm is a pussycat compared to the mighty .44 !
 
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