My first custom rifle
was chambered in 6mm-284, I still have it & I wouldn't trade it for anything. I'm running a 1-8" twist 28" stainless Kreiger screwed to a 700 Long action.
If you're going to use a long action, the 6-284 is a fantastic cartridge with excellent components available. For a short action, not so much.
You can push the 107 smk somewhere between 3300-3500fps, the 115DTAC should be 3100-3300 & boasts an advertised G1 of ~.590 which is right where the 6.5 SMKs are with a 400fps advantage. (note, 28" or longer barrel).
Is it hard on throats, sure, you stuffin a good bit of powder down a purdy small hole. Then again, Lamborgini's aren't known for great brake life either. You pay for performance, period. If you want long barrel life buy a 308, if you want superflat trajectory coupled with light recoil & match winning accuracy, the 6-284 will do it all.
PS- stated above was a comment in regards to elk, I won't get in an ethical debate here but 6mm isn't what I would consider an "elk slayer". Will it do the job? sure, most of the time, sometimes it might not. For deer & 'lopes, it should do very well out to a good distance. That being said, I won't be packing mine out of elk camp.