Need some help, I traded for a browning a bolt 300 win mag and it is having issues with casings getting stuck. First round with a cold barrel fired fine and ejects normally. Second round loads fine and fires but is hard to eject. The bolt lifts but is hard to pull back. The 3rd round fed fine, but after firing, was very difficult to remove. Actually had to place the butt of the stock on the shooting bench and force the bolt back. The ammo is brand new browning nickel plated 155 grain. Any help or past experience with the same problem would be helpful.