I have a 1905 MkII Ross sporting rifle that I'm trying to get going, and the last thing I need to do is check the headspace. The reason I'd like to check it is because when I got the gun it didn't have a bolt so I had to get one off ebay. I know checking headspace on a regular bolt action is pretty simple, if the bolt handle goes all the way down then the bolt is fully closed on the gauge, if it only closes part way then it's not fully closed on the gauge. But with a straight pull how do you tell if the bolt is closed on the no-go gauge enough to be out of tolerance? Is it just determined by how far forward the bolt is? Any help would be appreciated.