Thank you for taking the time to reply but it was talking about for suppressors like the 708. My 280AI is 23” now will likely cut to 19”.
Sorry about the confusion. I was talking about a suppressed 280 and 280AI as well. If you cut your AI down to 19", what you will find is that you will be in same velocity range as the top end of the 7-08. If you handload, you can change to a faster powder that may help, but with the slower powders that the 280AI likes, I am not sure that 19" will give you enough tube to get the pressure (and therefore speed) up.
