If the resized brass which has been trimmed can be loaded into the chamber and the bolt closed. It sounds like you have the bullet seated out too far and it is hitting the lands. What is the MOL of your rifle for this bullet.? You can measure it easily. Take a bullet and put it in the bore at the chamber, push it in with a pencil until it touches the lands. Hold it there. Have some one else put a cleaning rod down the muzzle until it touches the tip of the bullet, mark the rod at the end of the muzzle. remove bullet and close the bolt, put rod down the muzzle until it touches the boly face. Mark the rod. Measure the distance between these two marks that will be your max OAL for that bullet. This length may not fit in your clip , so you might not be able to load that long. Also be sure when you use the rod against the bullet tip that you have a flat tip on the rod. a pointed bullet could go into the threaded hole a bit and give a false reading. The ony other thing I can think of is are you using the correct diameter of bullets? they would hang up in the throat if not the right cal.