As stated it is very easy to cast a Savage barrel when it is off the rifle/receiver. I do lightly oil the chamber but I also use a heat gun to gently warm the barrel, as this is suppose to make for a better cast. I did try casting a chamber with the barrel on the rifle and poured too much Cerrosafe in the chamber over flowing into the receiver and locking it into the receiver. I then had to heat it up again ad pour it back out. My thought was if I were to try casting a chamber again with the barrel installed I would first cast/fill the interior of a piece of brass to get the right volume of Cerrosafe to use. Then I would melt it out and recast it into the chamber insuring I would not have an excess of Cerrosafe to lock the casting.