Behold, my .577 SA creation!

Never Been · Tuesday at 12:08 PM

Pictured here next to a .308 Winchester. It uses a 670gr heeled bullet in a 378 Weatherby case that's cut at the shoulder. The OAL ends up the same as a 6.5 PRC, so while it may theoretically fit a short action, I think the bullet profile (or lack thereof) would prohibit actual function.

It came about because Lee couldn't make a crimp die short enough for the actual cartridge I'm working on (the case cut to 1.4" with the same bullet) so I had to make as long of a dummy as I could. I bet it would put out some power though!

Here is the actual cartridge next to a .45 Colt, I'm calling it the ".585 Magnum Opus". It's going in a Maximum length Ruger Blackhawk.

Gert Odendaal · Tuesday at 12:49 PM

Never Been said:
View attachment 803377

Pictured here next to a .308 Winchester. It uses a 670gr heeled bullet in a 378 Weatherby case that's cut at the shoulder. The OAL ends up the same as a 6.5 PRC, so while it may theoretically fit a short action, I think the bullet profile (or lack thereof) would prohibit actual function.

It came about because Lee couldn't make a crimp die short enough for the actual cartridge I'm working on (the case cut to 1.4" with the same bullet) so I had to make as long of a dummy as I could. I bet it would put out some power though!

Here is the actual cartridge next to a .45 Colt, I'm calling it the ".585 Magnum Opus". It's going in a Maximum length Ruger Blackhawk.

View attachment 803381

This really looks great...I would like to see a video where you are shooting this beast

Never Been · Tuesday at 12:59 PM

Recoil will no doubt be substantial

. Wayne over at AHR was kind enough to donate an offcut for the barrel. The 480 case really puts things into perspective!

Gert Odendaal · Tuesday at 1:01 PM

Never Been said:
Recoil will no doubt be substantial . Wayne over at AHR was kind enough to donate an offcut for the barrel. The 480 case really puts things into perspective!

View attachment 803387

I would not contemplate shooting that beast for sure ...

Steve-O · Tuesday at 1:10 PM

Interesting creation. (a shot on the shoulder with that sure ought to get a critters attention!)

I am interested to hear how it shoots and what velocity you end up loading it to.

You must have a much higher recoil and pain threshold than I do, as I tapped out after shooting a cylinder of full power 454 Casull loads.

Never Been · Tuesday at 1:16 PM

Steve-O said:
I tapped out after shooting a cylinder of full power 454 Casull loads.

The Casull is certainly one of the harshest recoiling out there. This will run at lower pressure so it should level the playing field just a touch.

Wyatt Smith · Tuesday at 7:09 PM

how many rounds will the cylinder hold?

Never Been · Tuesday at 7:10 PM

Journey · Tuesday at 7:24 PM

Have you got custom dies figured out yet?.... i have a similar project i am working on (gotta find a shitty standard action with a magnum bolt next)

Never Been · Tuesday at 7:27 PM

Hornady said they shouldn't be an issue at all. I'm going to be sending them brass, bullets, and dummies as soon as the ATF gets back to me.

AZSkibo · Tuesday at 7:35 PM

In black powder, this would be spectacular.

Journey · Tuesday at 7:43 PM

Never Been said:
Hornady said they shouldn't be an issue at all. I'm going to be sending them brass, bullets, and dummies as soon as the ATF gets back to me.

Atf gets back to you????

Never Been · Tuesday at 8:03 PM

Anything over .510 caliber qualifies as a destructive device without approval. Over email they said it would likely fit a sporting use exemption but I had to submit a written request to make it official. Should be hearing back any day.

Journey · Tuesday at 8:05 PM

Ahhh ok.... glad my wildcat is .510

Never Been · Tuesday at 8:05 PM

AZSkibo said:
In black powder, this would be spectacular.

Hahaha I never considered that, the BP is a lot of fun in my 1898 SAA.

AZSkibo · Tuesday at 8:29 PM

40gr FFFg under a 250gr RNFP in 45LC is hell for stout. Yours should be a tad, ahem, more stout.

Wyatt Smith · Tuesday at 9:18 PM

AZSkibo said:
40gr FFFg under a 250gr RNFP in 45LC is hell for stout. Yours should be a tad, ahem, more stout.

Do you load black powder 45s? I’ve been toying with the notion. Does 40 grains fit in solid head cases? I’ve heard that was only for the old balloon head.

Hornedfrogbbq · Tuesday at 9:19 PM

....ummm...is this a good idea?

AZSkibo · Tuesday at 10:16 PM

Wyatt Smith said:
Do you load black powder 45s? I’ve been toying with the notion. Does 40 grains fit in solid head cases? I’ve heard that was only for the old balloon head.

I do! The case capacity may vary a little 38-40gr but 40gr is the original cavalry load. They lightened it up a tad when soldiers complained of excessive recoil (compared to 38’s and the like they were used to). The only trick is to use linotype or soft lead bullets and BP specific lube like SPG. If you’re going to store them for awhile, I use a thin card and then a thin felt wad over the powder to keep the lube off the powder. I’ve loaded and shot 1000’s of rounds of BP 45LC loads. I even loaded some 45ACP once for use in a Webley (it worked). Then I shot a stick of same in a Thompson and it was… unique and attention getting.

matt85 · Tuesday at 11:38 PM

I like it! The cartidge reminds me of the really large bore 19th century pistols.

I also like the idea of using black powder. That will keep pressures mild while still giving plenty of power. I have shot some very silly black powder guns in my day... Don't underestimate the amount of recoil this thing will generate!

Behold, my .577 SA creation!

Never Been

Gert Odendaal

Never Been

Gert Odendaal

Steve-O

Never Been

Wyatt Smith

Never Been

Journey

Never Been

AZSkibo

Journey

Never Been

Journey

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