I just bought a military 7 mm 1908 Mauser in almost new condition, with all parts from bolt to trigger with the same number. I sended it to my gunsmith to be transformed in a custom hunting rifle, but I am in doubt about the best caliber for the action. The .308 Win seems to be a little shorty, meanwhile the .270 Win looks too long. Which one of those two is more adaptable for this action? Thank you for your help.