Can a bullet be over spun? I'm now looking at a .223 for mid-range, 500yds. I have a choice of 1/9 or 1/7 with the Savages I'm looking at.
I called Savage on this and they said 69gr needs a 1/9 twist, but the 77gr needs 1/7. Berger says 1/8 for the 69's and doesn't recommend 1/7 until you get to 90gr bullets.
I seem to think that a 1/8 would be best, but Savage doesn't make it. I'm hoping to use either/both the 69's and 77's. So, which is the lesser of two evils? Being under spun or over spun? Will the 1/7 over spin a 69gr bullet? Totally confused why Savage doesn't make 1/8 twist. From 1/9 > 1/7 seems like a big jump.