375 RUM Build

Whitetail312

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Jun 15, 2018
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111
Location
Loganville, GA
Just to update the post I started gathering parts and now have my trigger, oversized bolt, and put my barrel on order! Looking for any info on shooting the hammer 329 grain bullets if anyone has any
 

robert l

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Feb 28, 2016
Messages
447
Location
manatee county florida
While the bolt face is the same diameter as the standard belted magnum cartridges, the body diameters are different with the RUM body being decidedly larger in diameter. The Remington M700 action will handle the RUM cartridge (Remington Ultra Magnum), it's important to pay attention to the width of the opening in between the action rails. Action rails are cut to allow the cartridge to feed from the box by the follower up into the feed ramp. But there has to be enough material left to hold the remaining cartridges down. You may need to adjust the feed ramp as well.

.375 RUM
View attachment 138992

The RUM cartridges, like the WSM cartridges, require the magazine box with the triangular windows cut into them. Getting some cartridges to feed reliably is both skill and art.


From left to right: .376 Steyr, .375 Flanged Magnum, .375 H&H, .375 Ruger, .375 Weatherby Magnum, .375 Remington Ultra Magnum, .378 Weatherby Magnum.
I would have to disagree with the comment about having to use a window mag box. I use the wyatts cfe-09 4 inch box and have no problems feeding any ammo.
 

sable tireur

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Oct 8, 2010
Messages
1,523
I would have to disagree with the comment about having to use a window mag box. I use the wyatts cfe-09 4 inch box and have no problems feeding any ammo.
Except you have to cobble up the bottom of your action to make that box fit and now it's only use is with that box.
 

sable tireur

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Joined
Oct 8, 2010
Messages
1,523
If you buy a magnum bolt from PTG like I did, you negate that issue.
You really don't understand the comment since it has absolutely nothing to do with the bolt. It is milling out the bottom of the action to fit that extra long box.
 

robert l

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Joined
Feb 28, 2016
Messages
447
Location
manatee county florida
So it seems it’s doable I believe. I can’t find any bottom metal for the 375, would a 338 bottom metal work since they’re both the same parent case?
I believe that you will need to use the wyatts cfe-0 that box will give 3.90 lenght.Any thing longer like the 350 smk if loaded out to max will be single load. and the action will need some mods to fit the 700 action.
 

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