If you go .30 mag, go big fat heavy projectiles. That's the difference. You "fire" .270 and 308 cased bullets. You "hurl" big fat heavy .30 cal mag bullets. Bullets that are hurled really really hurt.
Ive tried them all, and really like my 270wsm and use it a lot because its nicely in between and is not offensive. But of everything Ive owned and tried nothing has killed stuff like a decent weight .30 cal bullet with lots of grunt.
My favourite favourite is my 300SAUM shooting 168 grn NBT at 3100 fps. 20" barrel. Light. Great big holes. Near identical performance to the 300wsm you are considering.
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