I did a stutter step in my head and went back to read John's article on the twin 25-06's. Seems like a 1/9 twist is the ticket but it also seems getting a custom barrel in that twist is not all that easy either. All 1/10's at this site:

http://www.bugholes.com/

ER Shaw all 1/10

This thread from last year mentions Pacnors and Shilens in 1/9:

http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/7707234/2


Done in Convention by the Unanimous Consent of the States present the Seventeenth Day of September in the Year of our Lord one thousand seven hundred and Eighty seven.