In the first place, one doesn`t buy an Accumark for the purpose as a handier or lighter rifle. It is a long ranged, flatter terrained and open country rifle.
The 30-378 imo, is more overbored than is the 338-378. Hence imo, the 338-378 will have somewhat a better barrel life.
The choice of either the 30-378 or 338-378 depends on what the OP has now or what he feels he needs.
28 Nosler,,,,300WSM,,,,338-378 Wby,,,,375 Ruger
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