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338 Super

 
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  #8  
Old 12-10-2011, 10:29 PM
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Location: Texas
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Re: 338 Super

Quote:
Originally Posted by CA48 View Post
What are your velocity expectations with the 300 gr. bullets.
I am hoping to break the 3000 ft/sec mark without excessive pressure but 2900+ will be ok
as long as pressures are reasonable.

That does not sound like much but even a 50 ft/sec increase for the 300gr bullet is significant.

Hopefully the extra capacity will allow me to use more slower burning powder and hopefully
the 31" barrel will consume it.

To soon to know but time will tell.

J E CUSTOM
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  #9  
Old 12-10-2011, 10:34 PM
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Re: 338 Super

I guess I always assumed the 375 rum was a 300 rum necked up and have never looked at the specs. Is this not the case......we could really have a SUPER?
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  #10  
Old 12-10-2011, 10:50 PM
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Re: 338 Super

Quote:
Originally Posted by geargrinder View Post
338 Edge Improved?
Sorry ; I did not see your post.

No; it is larger and has more capacity.

It has a longer case body, less taper per inch (.010 thousandths end to end)and a shorter neck
than the Edge Improved.

It does have the 40o shoulder and will hold 6 to 7 grains more powder than the Edge Improved.

The 378 Weatherby case will still hold more powder than the super but hopefully it will match
the 338/378 and with a standard magnum bolt face and 1/3 rd the cost for brass it will be worth
the trouble.

I have always been happy with the 338 RUM except when it comes to using bullets larger than
250 grain.

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  #11  
Old 12-10-2011, 11:01 PM
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Re: 338 Super

Please keep us posted on this one, very interesting
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  #12  
Old 12-10-2011, 11:01 PM
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Re: 338 Super

Quote:
Originally Posted by bassin93 View Post
I guess I always assumed the 375 rum was a 300 rum necked up and have never looked at the specs. Is this not the case......we could really have a SUPER?
Y'all type faster than I do, so I will wait for more questions and try to answer them together.

And yes the 375 RUM case is almost the same. But the reason for using it is to be able to
neck it down to finished neck length and leave a "Donut" to head space the longer case
for fire forming and I can turn the necks before sizing down and keep neck wall thickness
.014+ without the thinning of the neck when sized up.

There is a method to my madness.

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  #13  
Old 12-10-2011, 11:22 PM
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Re: 338 Super

Glad your keeping busy in the off season. Sounds like you have your magnum moose killer, love those big 338's
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  #14  
Old 12-12-2011, 05:08 AM
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Location: Central,Texas
Posts: 479
Re: 338 Super

3000 fps without excessive pressure would be quite an
accomplishment with the RUM case.

Hope everything works out, if so I know what I'm rechambering
to next.
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