Can you have a SG that’s “too high”?
For example, with Berger 300NM 230 Hybrid ammunition (26” barrel, 2803 fps, 1:8 twist, 59°F, 0ft Altitude) gives an SG of 2.15 and would have a bullet rpm of 252,270.
That same situation with a 1:9 twist would have an SG of 1.68 with an rpm of 224,240...