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Why the 338 Lapua?

 
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  #1  
Old 03-10-2013, 01:41 PM
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Location: Maple Valley, Washington
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Why the 338 Lapua?

Iíve seen quite a few folks buying 338 Lapuas. I always wonder why when the 338 Edge or even a plain vanilla RUM seem to stack up better. The volume of the cases (per QuickLoad) in grains of water are:

108gr - 338 Lapua
110gr - 338 RUM
113gr - 338 Edge

Also, the bolt face is bigger on the Lapua which puts more force on the bolt at the same chamber pressure. Overall cartridge length for the Lapua is 3.681Ē per SAAMI standards versus 3.600 for the others so magazines and actions have to be slightly longer.

Lapua brass is hands down better than Remington brass, but that isnít an issue since Nosler came out with brass for the RUMs as it is excellent.

Also Nosler says in their latest handbook, ďThe 338 RUM delivers surprising accuracy for a large magnum cartridge. It has become the standard 338 caliber test round for the Nosler Ballistics Lab.Ē They could have picked a lot of others including the Lapua as their standard Ė but didnít.

The highest velocity that each can drive a 250 Accubond in equal length barrels is 2,941 fps for the Lapua and 2,990 fps for the 338 RUM. (Nosler reloading guide number 7.)

From what I can see the 338 Lapua has only disadvantages compared to the 338 RUM let alone the Edge so what gives? The disadvantages are not large but still, why do they sell? Savage for example doesnít offer a 338 RUM but they build more than one Lapua model. What am I missing?
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Old 03-10-2013, 02:33 PM
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Re: Why the 338 Lapua?

Well, I had a edge and while I liked it I got tired of brass issues (short life compaired to the lapua) so I sold it and built a Lapua. Nosler brass was just ok but Lapua brass is much better in my openion. SAAMI specs are for COAL and do not really mean much as the case length on the Lapua is shorter and easyer to to load in a mag and retain case capasity at the same COAL as the rum-edge. If the action used is a purpose built action than the bolt thrust is not really an issue. If you re building on a remington then the RUM and Edge obviously get the nod. I prefer the lapua only because of brass and the abilty to improve the case and gain performance. Now with Shawns brass the edge has an even more valid argument.
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Old 03-10-2013, 02:44 PM
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Re: Why the 338 Lapua?

I second the brass issues, Lapua Brass is second to non. the consistency between cases is in credible and if you research all the things Lapua does to make there brass the best Like neck thickness, drilled flash holes for the primer you will answer your question your self. and velocity isn't the key with Long to extreme range consistency is. So when you press a bullet into a lapua case and check run out and get less than a half of a thousandth your are a believer.
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Old 03-10-2013, 03:07 PM
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Re: Why the 338 Lapua?

What you both said makes perfect sense. I knew there had to be something going on that wasnít obvious and that guys that shoot Lapuas would know. Thanks for the explanation.
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Old 03-10-2013, 03:26 PM
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Re: Why the 338 Lapua?

AmmoGuide is showing

338 LM, 111.8
338 RUM, 104.8
300 RUM (EDGE), 107.2
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Old 03-10-2013, 04:37 PM
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Re: Why the 338 Lapua?

MontanaRifleman

There must be some apples and oranges going on here because Iíve measured my 338 RUM case volume at 110.7 grains H2O and my 300 RUM at 116 grains H2O.
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Old 03-10-2013, 04:42 PM
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Re: Why the 338 Lapua?

Interesting, is that before or after firing?
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