[common762]

anyone know what it would take to convert a 20mm to a 50 bmg, I am just wondering how similar the brass base and length are? thanks

 

[fastmonkey87]

Are you talking about changing the brass size or the calibre of the gun?

 

[Trutu]

The 20mm brass is a bit larger than the 50bmg. You can use 50 primers and powder however to reload 20MM. But converting it for use in a 50bmg rifle is impossible. You would need something like a lahti rifle to shoot them with. Big sky surplus is about the only place anymore where you can get reloading components. You would need a destructive device permit to own one.

http://www.obscure-reference.com/guns/lahti20mm/index.html

 

[hagar]

You would need a destructive device permit to own one.

http://www.obscure-reference.com/guns/lahti20mm/index.html

Not if it were necked down to .50 Cal. There are at least a couple of cartridges that are .50 cal. and based on the 20mm case. I just don't remember the names right now.

 

[belt fed frog]

the Fat Mac is one varient but there is a basic problem with it and the other 20mm /50 `they errode the barrel at an increadable rate (useful life 300 rounds ) and they never even came close to meeting the accuracy of a standard 50 BMG rifle

NOTE the Fat Mac and the other varients DO NOT use 50 BMG powder they use 20mm propellents and today all the top shooters use 20mm propellent in 50 BMG rifles namely V V 20N29 almost exclusively, WCC872 is not used due to relaitive unavailablity today ,868/869 no one seems to have found the sweet spot with it yet if there is one for 50 cal and not for lack of trying