In reply to:

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7mm Rem Ultra loaded back Vs 7mm Rem with max loads
270 Weatherby loaded back Vs 270 with max loads
30/378 weatherby or 300 Rem Ultra loaded back Vs 300 Win with max loads
300 Win loaded back Vs 30/06 or 308 with max loads
378 Weatherby loaded back Vs 375 H&H with max loads
6mm/06 loaded back Vs 243 with max loads

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assuming you mean normal (and safe) factory loads as "max" loads in the above, IMO there ain't a pinch of $hit difference in any of them except the .375 H&H Vs the .378 Wby. In that comparison there's a quite a bit of difference at least in energy.

Even here however I'll stick with the .375 H&H

Further I'll take the .270 Win over the Weatherby, the .30-06 over any .30 cal magnum, the 280 Remington over any 7MM mag and yes.....I like the .243 Win over the wildcat.

Reason???...I can get all these guns in featherweight rifles, they're fully the equal of the others mentioned and ammo is almost everywhere.

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