First off your 260 will run out farther than the win mag. At 1k my 260 handloads have the a slight edge (fps or ft lbs) on any factory 300 win mag ammo. I would go .300 RUM if you want a 30 cal and .338 RUM or .338 edge if you want a 338.
First off your 260 will run out farther than the win mag. At 1k my 260 handloads have the a slight edge (fps or ft lbs) on any factory 300 win mag ammo. I would go .300 RUM if you want a 30 cal and .338 RUM or .338 edge if you want a 338.
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