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The .577 Tyrannosaur or .577 T-rex is a proprietary cartridge developed by A-Square in 1993. It is an entirely new design, not based on any previous cartridge for the hunting of large game in Africa. The .577 contains a 750-grain (Expression error: Unexpected < operator.

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Monolithic Solid Projectile which when fired moves at 2,460 ft/s (Expression error: Unexpected < operator.
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 m/s
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producing 10,180 foot-pounds force (Expression error: Unexpected < operator.
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of energy. For comparison the .223 Remington/Nato 5.56mm round used in weapons such as the M16 rifle, when using a 77-grain (Expression error: Unexpected < operator.
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projectile, moves at 2,750 ft/s (Expression error: Unexpected < operator.
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 m/s
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producing 1,293 foot-pounds force (Expression error: Unexpected < operator.
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. The production model from A-square is based on their Hannibal rifle platform, which also comes in other large rifle calibers as well.


Online publicity Edit

There has been an increased amount of interest in this cartridge due to its exposure in the many online video sites. The many videos are generally titled "massive recoil" and show many people firing a rifle in this caliber being thrown backwards and falling over due to the recoil produced. These videos have been criticized as featuring people uneducated in shooting large caliber rifles. At the end of one of the most popular videos, a man shoots it with no ill effect. While some people maintain that this is a different rifle, others believe that he simply has proper weight-forward shooting form, allowing him to fire it without falling backwards or dropping the gun.

Reviews and controversyEdit

Many websites have done reviews of the .577 Tyrannosaur, with the general consensus being that it is impractical. One stated reason being the fact that on an animal of large size shot placement is more important than the size of the bullet. Another reason being that the amount of recoil produced only allows for a single shot in an environment requiring a possible second shot in quick succession. A-square does not specifically take a stand on this issue, but seem to imply a focus on hunting, especially African big game hunting. There is a story that it was created for sheer knockdown power of charging big game animals, but it is unclear if this is true.

ReferencesEdit

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