450b round through a 458 upper

Talk about the AR15 style rifles chambered in 450 Bushmaster.

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450b round through a 458 upper

Postby Bobby7208 » Thu Sep 26, 2019 2:55 pm

Was recently told you could shoot a 450 round through a 458 upper as long as you have a 450/458 bcg. Has anyone ever tried or can confirm?
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Re: 450b round through a 458 upper

Postby Hoot » Thu Sep 26, 2019 6:04 pm

Bobby7208 wrote:Was recently told you could shoot a 450 round through a 458 upper as long as you have a 450/458 bcg. Has anyone ever tried or can confirm?


The 450b case is smaller in diameter than the 458s. The 450b case will expand and rupture, risking injury to both the gun and anyone near it.

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Re: 450b round through a 458 upper

Postby plant_one » Fri Sep 27, 2019 8:58 am

i like my guns - and my face and fingers - enough that i'm not interested in trying something that foolish.



if you must experiment - i would recommend doing so with a very very very very very long piece of string.


and take video so we can laugh at, err experience the results from afar. :mrgreen: :mrgreen:



it might chamber, but the two rounds are different enough that there's not much chance of it being a successful bang - and the other option is a kaboom.
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