stikpusher
some styrene rod for the the charges themselves
At this scale, it's probably not an issue, but ASW had changed by the time these ships were in the fleet.
The K guns (and usuall the next two reloads) were set up with "streamlined" 350# DC, with straight 500# after those. (Stern cans were never streamlined--blowing off one's own stern made for complicated After Action Reports).
You wanted to drop an oval pattern of DC. So, you got up to 30 kts (about 3000'/minute; 50'second) rolled 2 from the stern, waited 2-3 seconds and popped two from K guns, waited 2-3 more seconds popped two more K's, then, 2-3 seconds, rolled two more. With Shallow Mid-depth, and Deep the basic three depth settings on 500# DC (later ones would gain a QA (Quick-Acting) and XD (extra Deep) settings).
So, this was pored out upon on paper with all of the vector match laid out to achieve Time-On-Target based on possible contact types.
The faster sinking side DC were because the most typical way for a sub to evade a DC attack is to turn to one side or the other, so as to take the length of the sub out of the long axis of the DC oval.
Knowing when to turn was part of the skill set of a sub CO. Sonar of the day shut down about 18-20kts from cavitation and water noise overcoming the listening head. And, you wanted speed laid on before 1.75 tons of (4x500 + 4x350) explosive detonated 50, 100, or 150' below your ship.