The 4 to 1 rule applies. If you wanted to gain 125 fps over the 223, you'd need around 16% more case capacity. I've had several 223 AIs to go along 223s, and never have seen anywhere close to 125 fps increase.
Who the hell pounded that sand up your a$$?
How the hell could someone post on this site for 14 years and not have heard of "The Rules"?
Cartridges aren't magic, as much as some guys want them to be.
