Hello, I am new to the hobby of casting and reloading ammo and had a few questions. The question I did have incase anyone were to know the answer was the shells I bought came pre primed and are high brass 2 3/4 inch. The wads I bought are CB1138-12, I have a lee 1oz slug casting mold and the primers are regular Winchester 209. From my reloading book it only shows 1 1/8oz shot weight with the wads and primers that match and it calls for Blue Dot smokeless powder. My only concern is because the slugs are only 1oz will the powder load be to much without the extra 1/8oz it calls for?