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I just had a 243 built and did a 8 twist to shoot the heavier bullets down to the 90-87 grain range. I would not do any other twist than that except a 7.5 for those range of bullet weights. I had a old box of 58 grain Winchester and was really surprised at how well it grouped them.
Just a "FWIW" and "It's worth exactly what you've paid for it" but an acquaintance has a 7.5 and can't shoot the 110's. The holes in the target at 200 aren't round. I'd go (and am going) 1:7 for that bullet.
As to the OP, an 8 should do well depending on where you are.