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The limit for most O/U is usually 9.3X74R or a 375 H&H such as in my Merkel 323E. The ones you see in 458 are pushing the limits, and one should also recall that the 458 is a fairly compact cartridge.

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I'm still not sure that I understand your logic. Correct me if I misunderstand, but by your argument, the .375 is at the limit of practicality for an O/U and a .458 is pushing beyond it. However, if cartridge length is the determining factor, then surely the opposite should be true - the shorter .458 round should require less gape than the .375 which is longer? I can't see why the case length matters - they both have the same headsize and once the action is opened far enough for the case to be ejected clear, I can't see what difference the case length makes.
What am I missing?

Edited by JabaliHunter (26/03/08 04:13 AM)

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