Thought of what was an interesting low cost big boom package. A 577 NE necked to .615" 20 gauge. (Think Ruger #1.) Use 20 Gauge loads for soft slugs and plinking and top loads of as much as you can take. Question I have is can you change the 577 brass to take shotgun primers? I think so with some lathe time but not sure. Use in shotgun season where restrictions are deemed necessary. Cheap components with uber top power when desired.
Thoughts?

http://www.dave-cushman.net/shot/shotshellloads.html

Hi Boomie,

I think JD Jones already did it with his 600 JDJ which is the 577 Nitro necked up and straightend to take .620" bullets. The rationale was to create a 600 Nitro-type cartridge that would squeeze into a Ruger #1.

Yes he did but this being .005" smaller means you could draw down 600 bullets and use cheap 20 gauge slugs. This is more versatile IMHO. Anyone know about the shotgun primers?

What a great idea...could you do one of the martini shotgun actions...semi paradox gun...

Ed

As long as it could take 45k PSI I don't see why not. The idea is shotgun to 600 Nitro power.

Alexander Henry did the 20/577 back in the 1880s although sounds like you are looking to make a straight 615" to take advantage of a smaller base/rim diameter.
Sounds like a fun gun (or merciless depending on the load!)

http://www.marrakai-adventure....eOfTheHarderOnes.htm

Very interesting info. Thank you.

Yes, I was thinking a straight case and yes the idea is spans cheap to expensive and mild to wild.

"Thought of what was an interesting low cost big boom package. A 577 NE necked to .615" 20 gauge. (Think Ruger #1.) Use 20 Gauge loads for soft slugs and plinking and top loads of as much as you can take. Question I have is can you change the 577 brass to take shotgun primers? I think so with some lathe time but not sure. Use in shotgun season where restrictions are deemed necessary. Cheap components with uber top power when desired.
Thoughts?"

Could it be erroneously dropped into a regular shotgun by some one being careless, resulting in a blown up gun, and person maybe?

I'm sure that's why a 600 NE can't be dropped into a 20 Ga. shotgun.

Always watch out for Darwin. He is a killer. I don't know if a 40k load would make a shotgun go "Boom" but would not want to find out. That would be kind of like a "proof load" pressure level. All kidding aside... Yes! You have to be careful and not let anyone have any live rounds who did not own one.

One thought I had was to take apart a 20 gauge shell and insert the .615-577 inside and shoot in a strong 20gauge platform like the NEF single shot. This would allow pressure up to 40k and use a regular shortened version or lengthen the chamber to 3". A case within a shotgun shell. This option would be super cheap and max power. This would allow for using normal shotgun shells as well so no loss of use.

I'm in the process at the moment of having a Pac Nor 600 barrel fitted to a Martini action.
It will be chambered as a 20 gauge 2.75" round, and I'm hoping to use RMC brass cases for heavier loads and plastic cases for the "shotgun" type loads.
I've got a mould for a 20 ga Paradox type slug and can get .620" diameter standard type moulds easy enough as well.
Also had Jeff Tanner make a .623" round ball mould as well, just for fun.

DC

That should be loads of fun! Please keep us updated with pics.

quote:

Originally posted by boom stick:
One thought I had was to take apart a 20 gauge shell and insert the .615-577 inside and shoot in a strong 20gauge platform like the NEF single shot. This would allow pressure up to 40k and use a regular shortened version or lengthen the chamber to 3". A case within a shotgun shell. This option would be super cheap and max power. This would allow for using normal shotgun shells as well so no loss of use.

Maybe use brass shotgun shell then you could solder the insert in. All though I have never seen a 3" brass 20 ga.

Bunch of us going to do a 24gaFH so to speak, using 3" 577NE cases,
to make use of the huge supply of inexpensive 58cal
Minie bullets in the .585-.587" size and use up a bunch
of slow twist 58cal rifled barrels(200 bucks). And the chambers will
still have the regular shotgun forcing cones so they will
be able to use the 2.5" 24ga Magtech brass and 24ga plastic shotshells
that BPI and others sell also..

Even though shotgun primers are more powerful than rifle primers
and more to be desired, the cases don't have to have them,
as long as gun is marked 24ga 3" and the chamber takes all
shorter 24ga shot and slug cases. And remark 577 cases 24ga.

And we are doing them in 100 dollar mossy 385 and 390 bolt
guns.They are strong enough for 40k loads as I got one done in
my 585HE with t-hole stock just to see the possibilities.
And those 440gr and 540 gr .585" Minies are the nicest slugs for
deer, hogs, and target. At 25-40 cents each.And save more at
10-20 cents cast your own.Ed

That sounds pretty cool Ed. I was thinking Ruger #1 or NEF but them bolt guns are fun too. I can see the 24 gauge thing working the same way in a single shot.
http://www.dave-cushman.net/shot/shotshellloads.html
So using that same thinking you could call the .615"-577 a 24 gauge 3" since it could fire 24 gauge ammo but just in a larger barrel without issue right? That would not chamber in any normal 24 gauge gun so no issue there.
So a 24 gauge shell will fire in a 577 NE chamber without much issue? I like the idea of a 24 gauge 3" a lot. It could be done a couple ways it seems.
I can see a 2.5" version in a bolt gun at 40k psi being quite fun shooting 20 gauge slugs. Thinking 1 ounce slugs at 2,300 fps would be about tops at 40k psi in the 2.5" version? 2,400?

We'd only run 40k loads in the 577 cases at 3 inches long or cut them
back to 2.5" if chamber is wanted to kept at 2.5 inches , as the
Magtech 2.5" cases are like older balloon headed cases
and expand too much just ahead of the rim if loaded
much over 25K. And that large expansion
is a real problem in trying to get them sized back down
just ahead of the rim. Tears up cases and sticks cases in dies.

But the 3" chamber is best with regular 9 degree forcing cone as you also
can use shot loads with slow twist barrels. And double ball, 58cal ball
loads,all good in shotgun only areas. AND Plastic 24 ga primed case
are only 13 cents each. Magtech brass is about buck each.
577 3" is 4 bucks.

A lot of guys talk down the forcing cones for slugs/bullets, but we find
it isn't that much difference than rifle freebores in large bores and it is
lot more versatile. And those slow twist 585/24ga barrels take high
speed lead and hardly no leading, and there are more available bullets
and slugs; lead, solid, turned, balls, and jacketed available than
any caliber over 458.

And I will do most shooting of minies out of cheap plastic 24ga cases with
a groove type crimp into the grooves of the slug.(not a fold or roll type),
like some the old paradox loads were done. That way the bullets stick out,
like in Magtech case thus need for 3" chamber...Get a lot of slower powder
in that way and real hairy speeds while keeping pressures down
at safe magnum shotgun levels. Shoot case once , throw away, as 13 cents
makes it easy.ED