You could probably use a piston launched D12-3, but Estes has to recommend something a simpleton can do reliably. An E30 is a good way to get a flight with some authority. 800 feet is higher than my Saturn V's went with 2xD12 and 3xD12, but that just makes it a bit of a safer flight. One wonders if a 24" chute is enough. If it is strong from plastic parts I suppose it is. We will see by this Spring.

Also 800 feet is in calm wind and good conditions. I suspect the lower end of the band for most people will be only 600 feet due to wind, humidity, non-vertical flights, etc.

We used to aim the rocket a bit into the wind so it would land closer so we could catch it.

Jerry