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338 rum rifle build?

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Unread 07-17-2008, 03:36 PM
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Join Date: Mar 2008
Posts: 603
338 rum rifle build?

I am on the verge of getting a rifle built. I am really considering a 338 edge but I am a little nervous about it being a wildcat. I have been reloading for a long time but I am not sure I know enough for this load. I was reading the issues on the recent posts regarding the problems people are having with brass etc. I want a caliber that I can reload safely without having to much trouble. Am I reading into this correctly? Is the 338 edge easy to reload for, or will I constantly have trouble with it? If so, is the 338 rum a decent alternative? is it as accurate as the edge? I realize the the edge holds more powder, is a little faster etc, but is it worth the extra trouble?

your knowledge and opinions are appreciated greatly.
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Unread 07-17-2008, 03:49 PM
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Join Date: Mar 2002
Location: Wyoming
Posts: 2,612
Not any major trouble loading for the 338-300 ultramag other than necking up the parent 300 ultra to 338. You neck size after that anyway. A generic 338 caliber neck sizer is all I use. Hornady makes these for most all calibers. Not much difference either between it and the 338 ultra. On average maybe a hundred fps which is trivial with that much power. If you are getting a rifle built anyway I would go with the 3380300 if it were me. If you didn't want to spend that much money a good 338 ultra factory rifle would be cheaper and a good starter.

If your going to build a custom anyway why not do a 338-416 rigby and blow away the ultamag stuff by several hundred fps.
Predictions are difficult, especially when they involve the future
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Unread 07-17-2008, 04:47 PM
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Join Date: Aug 2007
Location: Bull Mtns MT
Posts: 593
The 338 Edge is quit easy to load for.
The 338 RUM lacks NOTHING comparing the two. The extra case capacity is of little use because you don't need to push either load for accuracy or distance.
The gunsmith who built my 338 Edge built a 338 RUM just to prove that point. You would never notice the difference behind the trigger.
Take your pick. If built by a good smith, you'll be in hog heaven
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Unread 07-17-2008, 06:31 PM
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Join Date: Aug 2005
Location: Back in the south -NW FL..
Posts: 1,160
I'm getting the parts together for a 338 edge? -338 rogue? or some variation of the 300 rum case , just stuff whatever powder/bullet Shawn or Nathan or other knowledgable gunsmith tells you and you'll be fine.
There are pretty much standard loads for the 300gr smk bullet ,i'm hoping berger comes through w/a 300gr vld should be an OK deer cartridge................
AIPAC for president !!!!!!!!!!!!!!!!!!!
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Unread 07-17-2008, 06:52 PM
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Join Date: Feb 2004
Location: Pennsyltucky
Posts: 2,633
if you want a little knock down power, just go with the 338-378 Weatherby. it's a caliber they chamber their guns in and brass, dies and loaded ammo are available.
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Unread 07-17-2008, 07:25 PM
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Join Date: Jul 2004
Location: Texas
Posts: 7,235
Hear's my take on this issue.

It is just a matter of choice because all of the big 338s
will do anything you want them to as Gamedog said .

So do you choose a wildcat,or a factory round that is available
with out fireforming or neck sizing up or down and is strait forward
to reload.

If you single load,the case capacity can make a little difference, but
if you load to fit the magazine the longer case may not help because
you have to sink the bullet deeper reducing powder capacity.

I built a 338 RUM on a Weatherby mk 5 because the magazine is 1/10
of an inch longer than the Remingtion an allowed the bullets to be seated
further out increasing powder capacity to that of the 300/338 in a standard
long action remingtion with the 300gr SMK.

The 338/378 is a huge case and will top all but the 338/408 and it,s a factory
round. It is expensive but still not as much as the big wildcats.

The 338 RUM is a fine,accurate cartrige and a powerfull one that is hard to
beat so the choice is up to you.

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Unread 07-18-2008, 10:07 PM
Join Date: Aug 2006
Location: Columbia, MO
Posts: 1,476
Why not go for the edge? I started loading for the 6mm Ackley only a couple of months after teaching myself to reload, and results have been fantastic once I found the right load.
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