http://castpics.net/dpl/index.php/reloaders-reference/twist-rate-calculation
I just stumbled on to this today. I've been fascinated with it and have been playing around to see what I can learn about my own bullets and barrels. Are other folks here using this? Does it seem to be accurate? Seems like a wonderful resource. I'm sure that there must be many people in this group who already know a lot about this subject, but it's new to me and I'm excited to learn about it.