I went thru your dilemma, and after much thought i went with a 223 Wylde and it will shoot 55-80 gr no prob. 1-7.7 krieger. I have since dropped everything but the 80 smk's, they just shoot too darn good in that rifle, plus, i dont have to worry about burning out a barrel for a long time.
My 223w load with 80 gr is 3 MOA less than a 175 smk 308 mk118 at 1000. Whats not to like (on a calm day!)? I suspect your 75 grainers will be close to the same performance - if - your rifle likes them. I bought a couple hundred Berger 75's, and couldn't get them under 3/4 MOA...so stuck with what actually works rather than what looks good on paper. Big difference.
My 223w load with 80 gr is 3 MOA less than a 175 smk 308 mk118 at 1000. Whats not to like (on a calm day!)? I suspect your 75 grainers will be close to the same performance - if - your rifle likes them. I bought a couple hundred Berger 75's, and couldn't get them under 3/4 MOA...so stuck with what actually works rather than what looks good on paper. Big difference.