Thanks for the replies fellas!
Eric, I did confirm my ID is .240.
Cory, thanks for the lead I will check on those at the range.
Nick, you know me I've always got crazy ideas about my arrows. Here is what I was toying with:
Brown is my CE shaft
Green is the 2" of 2215 that I'm already footing.
Yellow is the 1 piece brass adapter I already use.
Right now when I blast an arrow into something hard it breaks right at the end of the aluminum footing. I was thinking if I JB Welded extra footing inside the shaft it might deliver a little more energy before it snaps off. Red would be 3-4" of internal carbon footing and the adapter would become a 5/16ths version of what I use already.
Of course the other option is to double foot the exterior, but I like the current OD of the shaft sitting behind my broadheads.
Thom