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7-378?

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  #1  
Unread 04-18-2010, 09:42 PM
TH TH is offline
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7-378?

Has anyone took the 30 -378 weatherby an necked it down to 7mm? What length barrel did you use? How many rounds down the tube? What type of velocities did you get?
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  •   #2  
    Unread 04-18-2010, 10:35 PM
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    Re: 7-378?

    Quote:
    Originally Posted by TH View Post
    Has anyone took the 30 -378 weatherby an necked it down to 7mm? What length barrel did you use? How many rounds down the tube? What type of velocities did you get?
    Check out this thread ...

    7mm-378 Weatherby mag

    Good luck!

    Ed
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      #3  
    Unread 04-18-2010, 10:51 PM
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    Re: 7-378?

    I have not but have experience with it because a buddy I shot with in Colorado did one. Don't even go there. The 30 is way to overbore and barrels don't last long. The 7mm is way worse. I don't think he got 300 rounds through it before a bore scope showed considerable erosion. His velocities and accuracy was excellent for a little while though. His pushed 162 grain bullets 3650 fps. I built two 7mm-300 ultramags for my personal use and they didn't last very long either. I still have two 31" match barrels chambered in 7mm-300 ultramag that I haven't bothered to put on and hope to sale. The 378 case should not be taken below 338 in my opinion for any kind of barrel life.
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      #4  
    Unread 04-19-2010, 06:33 AM
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    Re: 7-378?

    Quote:
    Originally Posted by Long Time Long Ranger View Post
    The 378 case should not be taken below 338 in my opinion for any kind of barrel life.
    Agreed!

    I once took a 416 Rigby case and squeezed her down to .284 and improved it.

    Can you say "overbore"? Talk about a picky son of a turd.
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      #5  
    Unread 04-19-2010, 11:49 PM
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    Re: 7-378?

    Quote:
    Originally Posted by Joel Russo View Post
    I once took a 416 Rigby case and squeezed her down to .284 and improved it.
    Holy cow! Please tell us you have a picture of the once fired case
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      #6  
    Unread 04-20-2010, 06:07 AM
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    Re: 7-378?

    Quote:
    Originally Posted by Autorotate View Post
    Holy cow! Please tell us you have a picture of the once fired case
    I still have a few cases. I'll dig them out and take a picture.
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      #7  
    Unread 04-20-2010, 08:09 AM
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    Re: 7-378?

    The first picture is the .284-.416 Rigby Improved.

    The second picture is a .30-.416 Rigby Improved that I am currently shooting.

    Yeah, it's a ton of work forming brass, but the .30 is killer accurate shooting the 240 SMK. This particular rifle has gone in single digits at 1,760 yards.



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