In the old Campfire tradition of beating a defunct horse, as Brad pointed out the 9,3x62 will indeed fit in a "standard" .30-06 action.
In fact it was specifically developed around 1905 to fit in the standard K98 Mauser action designed around the 8x57, to provide German settlers in Africa with a pretty powerful round in a relatively cheap rifle. It's basically am 8x57 with a shorter neck and longer body; as a result it has about the same case capacity as "improved" .30-06 based rounds.
I have yet to encounter a .30-06-based action that won't feed the 9,3x62 very slickly.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
