Thanks for that. It helps explain things some. My only question is where you wrote

"now if you increase the velocity it reduces the twist if you lower the velocity it requires a faster twist.
A 40 caliber bullet traveling 1800 fps 1 inch long exactly matches with a twist of 24 but a 40 caliber bullet 1 inch long traveling 2800 fps exactly matches a twist of 24."

I'm going to assume that one of those is a misprint, though it's possible I'm just reading it wrong. But I would assume the same bullet at faster speed would require the faster twist?

But then I was think I would be better to go with 1:24 twist than would be to go with a 1:30.