The LBT bullets sized at .411 or .412 would not chamber unless I flipped the bullet over and sized the nose to .410 down to the crimp groove.. Then I could seat them to the crimp groove and they would chamber perfectly. The crimp ring was catching them at .412 as well. With the body sized at .412 and seated the neck OD was .435, the chamber is .443. Now to get out and shoot them.