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Discussion Starter · #1 ·
.557 T-Rex


The 577 Tyrannosaur or 577 T-rex is a cartridge developed by A-Square in 1993 for professional guides that escort clients hunting dangerous game. The cartridge is designed for use in "stopping rifles": A rifle intended to stop the charge of dangerous game. The 577 contains a .585-inch (14.9 mm) diameter 750-grain (49 g) Monolithic Solid Projectile which when fired moves at 2,460 ft/s (750 m/s) producing 10,180 foot-pounds force (13,800 J) of muzzle energy.[1] The production model from A-square is based on their Hannibal rifle platform. This cartridge has the distinction of possessing the heaviest free recoil of all commercially available, shoulder-fired weapons, at 220 lbs into the shoulder with its heaviest solid of 750 grains.

http://en.wikipedia.org/wiki/.577_Tyrannosaur

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.557 Tyrannosaur Round
 

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Discussion Starter · #4 ·
Mods: I put this under bolt action because of the rifle they used in the video but the subject is actually about the round.  Please move if you so desire.  :)
 

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It must be. I'm wondering how this round would perform compared to a 50 BMG? I am assuming it is more powerful. Scratch that I just went up to the top of the page and saw a picture of the round that says it all!
 

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Younwould have to really be into reloading ;)
 

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Gun Smoke said:
It must be. I'm wondering how this round would perform compared to a 50 BMG? I am assuming it is more powerful. Scratch that I just went up to the top of the page and saw a picture of the round that says it all!
BMG has a ME of about 12,000 fp it pushes a 750 gran head to like 2700 FPS
 

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King Coal and Lord of the Blue Ladies
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Wimps
 

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Iconoclast
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The cartridge in the picture is not a .577 T-Rex cartridge, it's a .700 H&H.
Read the Wiki article. The Tyrannosaur is a rimless, bottlenecked cartridge. The round in that picture is rimmed with a straight case.
 

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untactical said:
The cartridge in the picture is not a .577 T-Rex cartridge, it's a .700 H&H.
Read the Wiki article. The Tyrannosaur is a rimless, bottlenecked cartridge. The round in that picture is rimmed with a straight case.
+1



For the record, a 12ga slug, pushing a 450grn projectile at 1600fps, has a M.E. of 2557.8 ft/lb
 

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Discussion Starter · #13 ·
untactical said:
The cartridge in the picture is not a .577 T-Rex cartridge, it's a .700 H&H.
Read the Wiki article. The Tyrannosaur is a rimless, bottlenecked cartridge. The round in that picture is rimmed with a straight case.
Yup you are right thats what I get for grabbing the 1st google result I got.
 
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