Re: RUM based longrange caliber choice.
I'm not bashing your experience, I'm just saying that a cursory look at the manuals, for a general and basic reference to indicate what a chambering can do, reveals a substantial difference between the .340 and 338 RUM. Take a look at Nosler.com for their 225g bullets as well as the earlier mentioned Hodgdon data. Somewhat under 200fps difference. Unfortunately, Nosler doesn't have data for the 250g bullets for the 338RUM. There's another step up to the EDGE and another step up to the EDGE AI. From what I've seen over the years here, and I've been watching closely for several years trying to decide which .338 I want, guys here are typically reporting a fairly wide range in fps with these different chamberings, as one would expect based on case capacity.
If you want a long range hammer for good sized critters and are going to the expense to build a custom and don't mind a wildcat and a brake, go big! JMHO.
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