The projectile was then rammed. The main projectiles carried by Colossus were Palliser armour piercing shell, weighing 714 lbs, common shell, or shrapnel.
The powder charges were supplied in hermetically sealed cases (type W), each holding four quarter charges, in silk bags of 73.75 lbs of Prismatic Brown powder.
A full (battering) charge used all four bags. Reduced charges of 2 or 3 charges reduced wear in the rifling and the cost of keeping the guns in serviceable condition.
5, 6 and 7 removed the lids from the case before placing it in the hoist's trough. Tthe rammer actually ran through the case, pushing the bags along the loading trays into the gun's chamber.
With the powder loaded, the trays were withdrawn.
The saddle was then moved to the right to line up the breech screw with the breech, and as the hydraulic ram moved forward, rotating drive bars and cog wheels pushed the breech screw fully home.
The saddle was then moved to the right, and as it did so, the lug on the breech screw was pushed to the left, thereby screwing the breech screw back into place. Finally, with the saddle fully to the left, a catch engaged to lock the breech screw in place. [If not locked in position, the pressure built up within the gun was sufficient to push the breech screw to the rear with such force that it could turn through the 30 degrees needed to blow it out completely. This could, as they say, ‘ruin your whole day’ if you were in the turret.]