set [i v] to [1]
repeat (length of [array v] :: list)
if <[i] > [300]> then
delete (i) of [array v]
end
change [i v] by (1)
end

deck26 wrote:

Your question is unclear. You've made a project that adds to a list but don't want it to do so??

Do you mean deleting any item with a value over a certain limit or deleting any item after a certain item in the list?