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Creating more case capacity in the stock .338 RUM?

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  #1  
Unread 05-18-2006, 11:20 AM
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Creating more case capacity in the stock .338 RUM?

All big boomer gunsmiths,

There is much discussion about the .338 caliber big boomers like the .338 KAHN (SP), .338 Allen Magnum, .338 Snip Tec, .338-378 etc etc.

My question is this. I want to chamber my next project .338 barrel to the longer cased .300 Ultra Magnum, using a .300 RUM chamber reamer with the proper .338 diameter Reamer Pilot. This will creat an improved case capacity .338-.300 RUM? Then use the .338 neck & throat reamer.

I then want to neck up the .300 RUM brass to .338.

My my gunsmith here in Alaska is extremely qualified and has discussed this project at length. He is on board and has done similar stuff before.

At the end, I want to be able to use more case capacity than the factory .338 RUM offers.

Is this feasible?

If so are there any issues that I need to know about?

Is there a factory/machined reamer system available for something like this?

Is there a better way to build the brass?

Why does the .338-378 not enjoy more discussion on the LR sites?

Thanks for any information.

Charles
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  •   #2  
    Unread 05-18-2006, 03:04 PM
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    Re: Creating more case capacity in the stock .338 RUM?

    Yes it can be done and it is a step up from a 338 rum. I am haveing one built. My gunsmith has bulit several with success. Necking up 300 rum brass is no problem, It would be nice to have brass other than remington.
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      #3  
    Unread 05-18-2006, 03:28 PM
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    Re: Creating more case capacity in the stock .338 RUM?

    what you're looking for is a 338 edge.
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      #4  
    Unread 05-18-2006, 06:00 PM
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    Re: Creating more case capacity in the stock .338 RUM?

    screech,

    I understand the Edge issue. But isn't that one gunsmith's cartridge? Unless there are publicly available reamers for it and such, I'll have to improvise. I am not too sure if he'd come off the secret.

    I think I am on track by necking up the .300 RUM to achieve similar, if not the same performance.

    Maybe I'll call it the .338 Super Edge! [img]/ubbthreads/images/graemlins/cool.gif[/img]

    Please keep the thoughts coming.

    Thanks
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    Unread 05-18-2006, 06:11 PM
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    Re: Creating more case capacity in the stock .338 RUM?

    Who is your smith?
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      #6  
    Unread 05-18-2006, 06:33 PM
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    Re: Creating more case capacity in the stock .338 RUM?

    Charles,

    I really don't have any secrets. You do want the 338 Edge. It is a 338-300 Ultra, Redding makes dies and has them in stock most of the time. I named it to avoid confusion about what rounds can be chamered in it. The way you are trying to go about it will work but is the hard way. If you want the easy way take a 338 Ultra reamer and set the head space with a 300 ultra go guage, now your done. Buy some dies, load & enjoy. There are some threads on reloading but if you go with H1000, CCI 250's, and 300 SMK's you will be pretty happy. If you OAL is around 3.775" I would start with 90.0 gr and work up.
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      #7  
    Unread 05-18-2006, 06:50 PM
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    Re: Creating more case capacity in the stock .338 RUM?

    Meichele, Stan Jackson.

    Shawn thanks a million! Your way does seem crazy easier! Again, thanks a million. I will execute that way.

    Redding Dies it is too.

    What about brass? Are they going to produce commercial quality brass for the Edge?

    Until then is it best to use .300 RUM necked up, or .375 RUM necked down?

    Thanks again. This place rocks!!

    ceg
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