Here is picture of a hard plastic molded shotgun case, holding
a slug, without crimping, a company is experimenting with.
This one with light slug supposed to do over 2000 fps.

Here is video by Corlanes Sporting, Dawson Creek, BC, CAN.
Known as, Rocky Mtn Rifles, video on Youtube of them testing our
585 HE in a barreled action, they are building for a guy. They are
shooting it into their big bullet trap with test load..

https://www.youtube.com/watch?v=1vzQjRGfT1A

Allan and Grant Swan in Australia are building 585HE for a guy,
the second they built. First one killed the buff pictured earlier .
AHR and Vestals will make folks here in US a 585 HE.
Here is another view of a Lawton action big enough for 585HE..

Here is picture of Rossi SS with 585 barrel mono-blocked into it,
chambered for our 585 BB 2.17" case, to do testing in a light rifle
with just pistol grip to simulate the case in pistols. Others going to
put case in leverguns, autoloaders. We got plenty of cases Ed