You would gave to make the 577 rim 24ga size, shrink it .030", and stamp
20 on the base, and in that way it is just another 24ga brass shotgun case;
That we make instead of getting magtech ones which are too thin to hold slugs right.
Mag techs so thin that when we make cases fit .585" slug it is so loose
in chamber it rattles, and firing expands huge amount and then it is
hard to size without crushing it.
Finally got back to forums.Been busy with 24ga FH and 585HE
and getting 585 cases made, as many as possible...
We are now working a bit with 24ga FH and here is picture
of it with our 585HE case. Both use same bullets/slugs, same
bore barrels. Main use difference, 24ga FH easy setup in break
actions and 585HE in bolt actions and falling blocks.
Picture of non-discarding 585/24ga sabot cup I found that holds
458 bullets and slugs tight. It had hammerhead type slug in it that
was pulled out and they wouldn't stay in tight. Sabot was a loose fit
in 20ga, made for 20ga, but small, so I shrunk the bottom rib,
fits perfect, super tight, in 24ga and 585HE. Fits real tight to give
good resistance for good ignition.
Here is another 24ga/585 sabot that holds .452" 45cal pistol
bullets. Made by Hornady for 58cal ML. With 250 gr bullet in 585
will go about mach 4.
Here is easy way to weight plastic stocks with hollow butts, use rubber
coated computer mouse balls, weight comes out perfect without being
too heavy if using that much lead.And coating keeps them quiet, and
we hold them in with piece dense foam under butt pad....Ed