Some additional Cleanup

Screenshots of the shotgun

The beginning of the script, no changes from default.
The nested for loops.
The IntOffset function to add a "jitter" to the loop variable
The body of the nested for loops.
The function BuildShotgunPattern
The build final pattern spread function.

for(row=-1;row<=1;row++) {
   for(col=-1;col<=1;col++) {
       sourcePos = currentpos + rotate(WorldRotaion) X (1,Offset*(col+rand), Offset*(row+rand));
       destPos = currentpos x 2000 + rotate(WorldRotaion) X (1,Offset*(col+rand), Offset*(row+rand));
       MakeNewProjectile(sourcePos, destPos);
       
   }
}

Screenshots of the probability based dropper

float DropProbability[] = {0.2, 0.3, 0.5};
Actor* DropTypes[] = {*BP_Pickup_Child_Health, *BP_Pickup_Child_Damage, *BP_PIckup_Child_Ammo};

Drop() {
    ProbThisTime = rand() /float(RAND_MAX)
    TotalProb = DropProbability[0]
    i = 0
    while (i < DrpProbabilitiy.size() and TotalProb <= ProbThisTime)
        i++
        TotalProb = DropProbability[i]
    DropItem(DropTypes[i]
}

Constructor, set up arrays
Init i and ProbThisTime
Init TotalProb
Condition for while loop.
Loop body
Using i to get the proper item to spawn.