Just be careful...The orig. .338 A-Sq was formed from a 460 or 378 Wby and later on, when Wby released the 338-378, A-Sq began forming .338 A-Sq out of it (they are NOT interchangeable, as the dimensions are different, shoulders completely different, etc.) I've never tried it, but I doubt you could close the bolt on the A-Sq using Wby ammo. The other way around could be an issue. Although the heads were stamped .338-378 Wby, the cases were ink stamped A-Sq. 'Just didn't want to see another collector of oddballs get hurt! The Norma Wby cases also seem to fail a lot more in the A-Sq (worked too much, too hard for the Ps involved?) To complicate matters even further, A-Sq later released the .338 Excaliber (beltless) which uses a completely different, larger case. This one shoots great using A-Sq cases and <100 gr of powder in hot climates.
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