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Next build 375 something

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  #8  
Unread 10-10-2012, 03:45 PM
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Re: Next build 375 something

I shoot a 270gr. Barnes TSX at 3130fps
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  •   #9  
    Unread 10-10-2012, 05:32 PM
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    Re: Next build 375 something

    Quote:
    Originally Posted by Tikkamike View Post
    I shoot a 270gr. Barnes TSX at 3130fps
    That has got to be the best sentence ever.
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      #10  
    Unread 10-10-2012, 05:57 PM
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    Re: Next build 375 something

    Quote:
    Originally Posted by Frank7mm View Post
    Truthfully I don't expect alot of improvment, but I love my other improved cartridges and the long brass life. Possibly a 338 excalibur necked up to 375. I have plenty of other guns for typical hunting so it's more of a venture in to extreme long range.

    In my opinion the Excalibur is about the ultimate 338. But it needs a larger action than the 700
    Rem.

    At one time I looked at necking it up to 416 because of case capacity and with the requirement
    of a MK 5 or a custom action plus the cost and availability of brass and loading equipment it
    more than tripled the cost.

    The 416 buff will push a 400 grain bullet almost 2700 ft/sec without being overloaded and case life
    of the 416/375 is very good.

    Without a Muzzle brake it is just about all the recoil I can deal with and after 40 or 50 rounds
    at the range the fun has gone out of it.

    I also designed a 338 super based on the 375 RUM brass because it is available and works
    in a magnum bolt faced 700 REM. It has been improved and the capacity increased to 115
    to 119 grains of powder (Depending on what powder).

    Testing is still on going but it appears that case capacity may be unusable, so the standard case
    may be the way to go for the .375 bullets.

    Rather than improve on the 375 RUM I would elect to go with a 378 Weatherby and a mark 5
    action.

    Just an opinion, But it is fun to play with different ideas.

    Keep us posted on your project.

    J E CUSTOM
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      #11  
    Unread 10-10-2012, 06:30 PM
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    Re: Next build 375 something

    Quote:
    Originally Posted by Tikkamike View Post
    I shoot a 270gr. Barnes TSX at 3130fps
    If "Anything less than overkill is underachievement!" yur way under doing it with that itty bitty 270gr projectile!
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      #12  
    Unread 10-10-2012, 06:34 PM
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    Re: Next build 375 something

    Quote:
    Rather than improve on the 375 RUM I would elect to go with a 378 Weatherby and a mark 5
    action.
    You wouldn't use a PTG bolt and go with the Excalibur case? I have been playing around with the WSM cases in long actions and find if you can seat the big long bullets so the boattail is just above the doughnut the gain is sugnificant. To get the most out of the big boomers I throat them so I can seat heavy bullets long. My 338 WSM gets the 300 gr Bergers 2600fps, witch I feel is pretty darn good. Has anyone throated their 375 RUM for a very very long AOL?
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      #13  
    Unread 10-10-2012, 08:29 PM
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    Re: Next build 375 something

    Quote:
    Originally Posted by Frank7mm View Post
    You wouldn't use a PTG bolt and go with the Excalibur case? I have been playing around with the WSM cases in long actions and find if you can seat the big long bullets so the boattail is just above the doughnut the gain is sugnificant. To get the most out of the big boomers I throat them so I can seat heavy bullets long. My 338 WSM gets the 300 gr Bergers 2600fps, witch I feel is pretty darn good. Has anyone throated their 375 RUM for a very very long AOL?

    When you open a Remington bolt face up more than .540 it doesen't leave much. and the extractor
    needs to be thinned making it weak.

    I personally don't like to open up a remington beyond .545 for any reason and the PT&G bolts are
    good but they are the same size.

    I know they do it, but when you increase the bolt face Diameter you increase the bolt loading, and
    exceed the original design loading. This can cause recoil lug set back with heavy loads.

    Also if you load longer than the magazine length you must load it like a single shot.

    I build all of the big cases on Weather mark 5 actions if a factory action is used because of bolt dia.
    and mag length.

    J E CUSTOM
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      #14  
    Unread 10-10-2012, 08:53 PM
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    Re: Next build 375 something

    Quote:
    Originally Posted by Tikkamike View Post
    I shoot a 270gr. Barnes TSX at 3130fps
    My pet load in my 375 h@h is the 300 tsx with I4320 under it at 2550 fps. Gotta love how the 375's hit with these pills. And it's scary accurate for a lightweight rifle(8# with a scope on it). If it's an inch or more I know I messed up, as it WIL hold sub moa all day. Hell, it was sub moa one day with the scope shook loose.
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