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300 RUM to 338 Lapua Mag?

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Unread 11-08-2012, 01:45 PM
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Location: Central AZ
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Re: 300 RUM to 338 Lapua Mag?

The 338 Lapua, 338 RUM and 338 Edge all have similar ballistics/velocities within 100 fps, or so. They all use slow burning powders such as H1000, Retumbo, etc. So barrel life will be about the same with all of them. How hot you load the round will have more bearing on barrel life than any of the three calibers.

What is true, is that you will get twice to three time the case life using Lapua brass. When you factor that into the cost of the brass, plus the inherent quality of the brass (read less case prep time), and the ability for Lapua brass to withstand higher pressures - the 338 Lapua is at least on par with the other two above.

Anymore, the calibers I shoot are determined in large part by whether or not Lapua makes brass for it.
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Unread 11-08-2012, 04:59 PM
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Join Date: Dec 2010
Location: Elizabeth, WV
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Re: 300 RUM to 338 Lapua Mag?

Lapua brass is much better, I agree with that. It is $2.50 a piece where remington is $1. $2.50 isn't bad though when you compare it to weatherby at around $4 a pop.

I went with the rum instead of the lapua because of the bolt face. I wanted to use my standard magnum action. I really haven't done much research on the edge. I don't know how much difference the .090" would make. It sure is easy to buy 338 rum brass that doesn't need any sizing or trimming.

I shoot a 250 match king at 3150 fps. My brother-in-law has a 338 lapua improved and he shoots the 250 at 3170. He probablly could go more, I can't but at 20fps its not worth it to me. Forming brass either wasting bullets or going through the cream of wheat hassle. I would like to see what a regular lapua would do with the 250.
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Unread 11-08-2012, 05:39 PM
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Re: 300 RUM to 338 Lapua Mag?

Barrel life is 6 one way and half a dozen the other. There is no fireforming involved in making 338 edge brass....... simply run 300 rum threw 338 expander add primer,powder,bullet and shoot. 338 rum vs 338edge is a toss up unless you already have 300 rum brass. Lapua brass lasts twice as long and cost twice as much, rem brass is very capable of .25moa with minimum prep and a forgiving cartridge like the edge.....again a toss up. 338 edge bushing dies are comparatively priced to 338 rum bushing dies. Both can be had in traditional fixed neck die fairly inexpensively, perhaps $25 more for a gutted 375rum fl body die for the edge............What ever you want out of these three will be awesome. Make no mistake...... There are different ways to skin a cat but these all end the same......... only some easier than others.
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Unread 11-09-2012, 12:57 PM
SMF SMF is offline
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Join Date: Apr 2011
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Re: 300 RUM to 338 Lapua Mag?

Okay so I'm leaning towards the .338 Edge. I've go a lot of Norma 300 RUM brass already and the stats on the cartridge are very impressive. I've also got a really large supply of Retumbo. Thank you for all the input gentlemen.

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Unread 11-09-2012, 02:27 PM
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Join Date: Jun 2007
Location: Wilmington NC
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Re: 300 RUM to 338 Lapua Mag?

700 actions are not good candidates for the Lapua as stated.

If looking for the LR ballistics look at the 300 RUM and the new 215-230 grain 30 cal bullets.

If set on a 338, then the Edge is the way to go.

On the new barrel Melonite coat it ($100) and it will last 2-3x longer. Google Melonite here or on web for info.

Melonite or Salt nitride barrels

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Unread 11-09-2012, 04:08 PM
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Location: Elizabeth, WV
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Re: 300 RUM to 338 Lapua Mag?

One load I played with was 97 grain retumbo in my 338 rum. It was a compressed load. Just wondering how much more retumbo will fit in the edge. Let us know what kind of velocity and loads you get with the edge. I am going to do some research on it. I'd like to rebarrel mine to go with 10 twist instead of 12 so that would be a great time to switch.
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Unread 11-09-2012, 11:46 PM
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Join Date: Nov 2007
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Re: 300 RUM to 338 Lapua Mag?

I have an edge, shooting 300 grns at 2830, my 10 year old son shoots it, so recoil should not be an issue for you..
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