Musket Man
Veteran member
If the bolt wont close on FL sized brass it sounds like a headspacing or case length issue and possibally your chamber is to tight in 1 of these areas. You could try shortening a case a bit and see if the bolt will close. If you color the neck and shoulder of a case with a black marker and then try to chamber it you will be able to see where it is tight by where it rubs the marker off of the case. Is this a new unfired rifle?