Ak-Red
All the Remington Ultra Mags are based off a .404 Jeffery case. The case is as big around as .375 H&H case is at the belt. The .338 RUM is different from the rest because the case is shorter than the other RUM's. The .338 RUM has a standard case length of 2.760in and the rest are 2.850in. I asked Remington factory reps why this was and they told me that they got the best ballistics from the shortened case. So no the .338 RUM is not just a .300 RUM case necked up eventhow there is that wildcat available. Hope that aswered your question. I also have a .300 RUM and absolutely love to shoot it but not as much as my .338 RUM!
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hit em' hard and hit'em fast
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