I've changed my views on this due to Litz's research. I used to be in the camp of optimizing twist to the bullet weights I was going to shoot but now think the increased BC of a faster spinning bullet is going to benefit me more down range than a .1" smaller group at 100. I have an 8.5" twisted .260 and a 12" twisted .308. Both shoot very well with any bullets I care to put in them, up to 140gr VLDs in the .260 and up to 175gr VLDs in the .308. In fact, my best 10 shot group from my .308 was using 168gr VLDs. This one measured .662 MOA for 10 shots at 100m:

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Even with the slower twist shooting this well for me, with the quality of bullets nowadays I highly doubt that spinning them too fast is a concern. Next time I'll be going 8" in a 6.5 or 10" in .308.

John

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then I will hear from heaven, and I will forgive their sin and will heal their land. 2 Chronicles 7:14