Yes the 28 is smaller diameter than a 30 cal but few 30 cals out perform one. .......................Yep!......At the 500 yard mark in terms of retained velocity and energy, the 28 Nosler using a 175 ABLR is just about even with the 30-378 using a 180 gr AB......Beyond that the 28 Nosler begins to take over.
28 Nosler,,,,300WSM,,,,338-378 Wby,,,,375 Ruger
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