Could a 20mm sniper be effective? In what scenario?

en.m.wikipedia.org/wiki/Battle_of_73_Easting

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To kill a werewolf and dinosaurs of course.

AFAIK about Burger laws, a (reproduction) gatling gun is not an MG because it is hand-cranked.

Making one in 20mm+ should be doable.

Ooo, make one in 40mm. Perhaps 40x53mm using training or smoke ammo for pleb use. You might even be able to sell that to cops or the .mil as well.

You realise you can manufacture stuff like that if you have the know-how, right?

There was that guy made an AK in 7.62x25mm Tokarev, and I know that there's books out there detailing how to DIY a .50-cal upper for an AR, so why not a 20mm DIY upper for a Barrett?

What's so hard about it? Even BB can do it.

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someone help me out real quick with this thought. In theory which projectile materials,projectile shape, case dimensions,case materials and everything else that goes into having an effective round would yield the best possible penetrative properties im thinking
what would be the best means for producing incredible amounts of velocity on a very heavy round is what it boils down to I suppose

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You're forgetting the 1968 GCA which created the "destructive device" class, making everything over .50 other than "sporting purpose" shotguns because that would be the only thing to get retarded fucking fudds off of their lazy asses into NFA items.

You're talking out of your arse serbanon; the type 90 can shoot while on the move, while the type 10 can shoot while turning

Yeah, but my point is, it's still not legally an MG, so you can make your own by jumping through a couple of hoops. You couldn't if it was legally an MG, because of that gay 1986 law.