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whats the diff. between 338RUM and 338 lap

 
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Old 10-15-2007, 08:15 PM
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whats the diff. between 338RUM and 338 lap

ballistics etc what the overall improvement
thanks
sid
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Old 10-15-2007, 09:19 PM
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1: Some smiths will not chamber the 338 Lapua on the Remington 700 due to the very large base which if you dont want a 700 it is no big deal. If you do want to use a 700 for a project, the 338 RUM is one of the next best things.

2: 338 Lapua brass is phenominal brass. They can take a pounding and still hold a primer. They last along time and can be reloaded many more times than RUM brass. The quality and concistency of the Lapua brass is much better.

3: Both are very accurate (inherently) and both produce good muzzle velocities. However, there are a number of improved versions of the 338 Lapua that will blow the RUM out of the water. Stock for stock, they are pretty close to eachother all being equal.

4: Lapua brass is more expensive and harder to come by. For some it is worth it and for others it isnt.

These are only a few points to concider. Some time ago I was faced with choosing between what caliber I wanted and the smith I wanted to use. I really wanted a 700 action and the most important thing was my smith choice. I also wanted a 30-338 LM improved. The smith would not build the LM on the 700 bolt. I would have rather used that particular smith than use another and get my LM. I settled for the 300 RUM instead. One of these days though, I will have a 338 LM based cartridge chambered rifle in my safe.
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Old 10-15-2007, 10:24 PM
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Michael summed it up very well.
If you use Norma brass in the Lapua I don't think ballistically there is a pennies worth of difference in the two, although dimensionally the Norma is much more consistant than the Rem.
Because of the harder more consistent Lapua brass I think the 338 Lapua is a far better choice if you are using a custom action and use Lapua brass. If you are going to use a commercial action such as a Rem 700 I would go with the 338 RUM or 338 Edge.
James
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