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338 rum (improved???)

 
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  #1  
Old 12-09-2010, 08:41 PM
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338 rum (improved???)

A quick question for those in the know. I have a 338 RUM that I would like to have re-built. Possibly just having a 30 inch barrel put on, or changing to a 338 Edge (or Edge +P). My question is: has anyone tried to change the shoulder on the original 338 RUM to get better ballistics (338 RUM Improved?). If so, was it a successful or didn't it give any better performance than the original round. Just being curious before I have the gun re-built.

Last edited by 600BP; 12-09-2010 at 08:54 PM.
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  #2  
Old 12-10-2010, 04:27 PM
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Re: 338 rum (improved???)

from my understanding the .338 RUM cannot be improved very much. Niether can the edge. Not that it cant be dont, it just doesnt help much. If your gonna screw a new tube on your rifle and your thinking a 30" i would go for the EDGE. If you have a big action (WBY or custom) I would go Lapua Improved. The +P sound promising, but dont hold your breath.
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Old 12-10-2010, 07:56 PM
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Re: 338 rum (improved???)

Search for Goodgrouper and his 338Thunder. That's basically what it is.
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Old 12-11-2010, 12:07 AM
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Re: 338 rum (improved???)

Thanks. I just happen to have two mark V actions sitting in the safe.
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Old 12-11-2010, 02:53 PM
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Re: 338 rum (improved???)

do a search for tejas, 338 tejas 300 smk 2950- 3000 fps
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Old 12-11-2010, 04:33 PM
B23 B23 is offline
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Re: 338 rum (improved???)

What's the H2O capacity of a 338Edge improved?
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  #7  
Old 12-11-2010, 06:32 PM
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Re: 338 rum (improved???)

You just can't gain enough powder capacity with improving the ultramag case to make it worthwhile. With 338 it takes quite a bit of powder to make a noticable difference. That is why the 338 RUM, 338-300 RUM or edge or whatever, and 338 lapua all shoot exactly the same. The difference between barrels in either one determines whether your accuracy load will be in the 2700's or 2800's fps with the 300 smk and not which of these three you choose. The lapua case has more room for improvement and you can gain some there and jump into the 2900's fps with the 300 grain. Then the huge 378 wby case improved and the 416 rigby imp case can get you over 3100 fps. To get the extra velocities 3-5 grains more powder in an ultramag case just isn't going to matter. 15-20 more grains in the big cases will give you a little extra velocity. The Excalibur which is about the same thing as a 416 rigby improved is about the best you can do with easy to get brass for your mk 5 action. They can get over 3100 fps with the 300 smk in a 30 inch barrel. It is a standard cartridge which makes it much easier.
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