Spent a couple days making brass for the 480 Achilles

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JimT
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Spent a couple days making brass for the 480 Achilles

Post by JimT »

It takes a bit of time to cut the brass to the proper length, de-burr and chamfer it.

I loaded it with the new Killebrew bullet and the Huffaker bullet. Hope to get to the range this week if it dries out a bit.

Image
The Killebrew bullet ... 12 gr. 2400
About 870 fps

Image
The Huffaker bullet .. also with 12 gr. 2400
Around 820 - 830 fps

The Huffaker bullet is a hollow base bullet and records lower velocities than the same powder charge with a solid base bullet.

Hope to make it to the range this week. This last week was wet, windy and cold. Above 75 today so things should dry out nicely.
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Rimfire McNutjob
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Re: Spent a couple days making brass for the 480 Achilles

Post by Rimfire McNutjob »

What do you suspect is the main reason for the velocity difference?
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Re: Spent a couple days making brass for the 480 Achilles

Post by JimT »

Rimfire McNutjob wrote: Sun Jan 26, 2020 4:07 pm What do you suspect is the main reason for the velocity difference?
Extra capacity due to the hollow base in the Huffaker bullet. If I seated the solid base bullet out further (if I had room to do so) it would lower the velocity.
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Re: Spent a couple days making brass for the 480 Achilles

Post by GunnyMack »

I read the article about the 480 but I dont remember what the parent case is...?
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Re: Spent a couple days making brass for the 480 Achilles

Post by 2ndovc »

Those look like some real thumpers!! :D

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Re: Spent a couple days making brass for the 480 Achilles

Post by JimT »

GunnyMack wrote: Sun Jan 26, 2020 5:37 pm I read the article about the 480 but I dont remember what the parent case is...?
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Re: Spent a couple days making brass for the 480 Achilles

Post by piller »

Those Killebrew bullets look as if they would do some serious damage to a living critter.
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Re: Spent a couple days making brass for the 480 Achilles

Post by Grizz »

is that something like crimping in a gas check rebate?
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Ray
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Re: Spent a couple days making brass for the 480 Achilles

Post by Ray »

My first achilles brass was magtech brand with the cannelure so I was quite restricted in choice of length.....but the cannelure made it easy to cut.....

A hundred of these from grafs don't need cutting/trimming :

https://www.starlinebrass.com/45-cowboy-special
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JimT
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Re: Spent a couple days making brass for the 480 Achilles

Post by JimT »

Ray wrote: Sun Jan 26, 2020 9:59 pm My first achilles brass was magtech brand with the cannelure so I was quite restricted in choice of length.....but the cannelure made it easy to cut.....

A hundred of these from grafs don't need cutting/trimming :

https://www.starlinebrass.com/45-cowboy-special
I need to order some of those.
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Rimfire McNutjob
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Re: Spent a couple days making brass for the 480 Achilles

Post by Rimfire McNutjob »

Ray wrote: Sun Jan 26, 2020 9:59 pm My first achilles brass was magtech brand with the cannelure so I was quite restricted in choice of length.....but the cannelure made it easy to cut.....

A hundred of these from grafs don't need cutting/trimming :

https://www.starlinebrass.com/45-cowboy-special
Were you guys thinking about that when you decided on the case length? That CB Special would be the proper length? Or are we in lucky territory here? I'm not complaining ... just curious.
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Re: Spent a couple days making brass for the 480 Achilles

Post by AJMD429 »

Mike Haas at AmmoGuide.com was interested in the cartridge, but said what's on here "doesn’t include the basics of what I need to add to AmmoGuide – a simple case diagram or even a table of the external case dimensions. I think I picked up that the case length is 0.9” but that’s about it. Is this a shortened .45 Colt using a .476” heeled bullet?

But if we can figure out the case dimensions and a decent description, we can add it.
"

Anyone who knows more details about it might want to go there and message him the information.

https://ammoguide.com/cgi-bin/contact.c ... yp=support

(AmmoGuide is a cool site for both factory-load recipes, as well as user-submitted ones, but the real forte is very flexible cartridge comparison tools and things like picking your favorite cartridges and seeing what suitable powders they can all use, or printing ballistic or dimensional comparisons.)
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JimT
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Re: Spent a couple days making brass for the 480 Achilles

Post by JimT »

Rimfire McNutjob wrote: Thu Jan 30, 2020 10:21 pm Were you guys thinking about that when you decided on the case length? That CB Special would be the proper length? Or are we in lucky territory here? I'm not complaining ... just curious.
No .. We were not aware of that cartridge.. I am not sure if it was being made at that time or not. We looked at the .476 Ely which is the largest factory caliber the Colt SAA was made in and decided to make our cartridge a similar length. The .476 Ely was .88" ... the 45 ACP (which we were attempting to duplicate ballistics) is .898" .. we decided a round .900" would be good.

EDIT: the cowboy cartridge will work just fine though a few thousands shorter ..
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Re: Spent a couple days making brass for the 480 Achilles

Post by harry »

Well there ya go Jim, the 480 Achilles short. :D
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JimT
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Re: Spent a couple days making brass for the 480 Achilles

Post by JimT »

harry wrote: Fri Jan 31, 2020 9:30 am Well there ya go Jim, the 480 Achilles short. :D
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Re: Spent a couple days making brass for the 480 Achilles

Post by 1894c »

JimT -- that 480 Achilles of yours looks interesting...looks like fun too... :)
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