Without a doubt 1-12 twist. It will stabilize 180's with possible exception to VLD's. 1-10 is faster than needed in most all 30 cals. 1-11.25 will do about everything.
Here's a blurb right off of Shilen's website...I think they underrate the 12 twist though as 180's will do fine in the 12.
.308
- 7" * for heavy VLD bullets and/or subsonic ammo.
- 8" for bullets heavier than 220 gr.
- 10" for bullets up to 220 gr.
- 12" for bullets up to 170 gr.
- 13" * Ratchet rifled 4 groove
- 14" * for bullets up to 168gr.
- 15" * for bullets up to 150 gr.
- 17" * for bullets up to 125 gr.
Last edited by msalm; 07/28/14.
