The 338LE ammunition is more seasonal than the 308LE is, the latter is run twice per year while the former is once per year. Hornady usually runs it in the spring so it should be showing up in abundance fairly soon. You can always call Hornady and inquire when they expect to ship 338LE and be ready.
32SPC is the same, one run per year while there is rarely a shortage of 30-30 year around.
If you wish to be put on the notify list when I launch the bullets here on MO, just let me know.