Any mil-dot reticle. Zero at 100, and hold .5mil =200, 1mil=300, 2=400. Between 300 and 400, every 10 yards = 0.1mil, so 330=1.3, 380=1.8, etc.
For me this is far easier, and more accurate at odd yardages, than the unevenly spaced yardage-based reticles. A 270 wont need quite that much holdover, but you’ll be within a tenth or two (so realistic maximum error about .2mils or roughly 3” at 400 yards depending on what load, your personal guns velocity, etc). I personally prefer to dial especially past 350 or so, but this works well for moderately long ranges like you are talking about.
Trijicon has some good 3-9 and lower powered hunting scopes with mil-dot reticles, which would be my choice if you want 2fp scope, so you arent forced to be at too-much magnification to use the reticle. Or the S&B Klassik 3-12 with P3l reticle is a good FFP option with a good hunting mil-dot (ie still visible on lowest magnification).