XP-100 7br loading problem -?
Bought Lapua 6br brass -expanded it to .284" w/an expander mandrel from Sinclair -checked each case to make sure it chambered right -they did.
So today I primed them -loaded two with 26gr of H-322 -seated a 139gr interlock -checked to see if they would chamber correctly -would not chamber .
I checked the outside neck diameter of a couple of non loaded cases -then measured the loaded ones -about 1K bigger when loaded .
Turned the bolt w/a bit of force and the round chambered but quite tightly -when opening the bolt it makes a "pop" at the end of the bolt opening cycle.
I looked for marks on the case and bullet finally finding a ring at the neck shoulder junction.
It's an extruding little ring that is not there before I chamber the round -it seems to make the ring after I worked the bolt up and down .
I did this to try and find a mark on the brass.
Any ideas why this is happening ?
AIPAC for president !!!!!!!!!!!!!!!!!!!
Last edited by ol mike; 12-23-2012 at 08:52 PM.