@emma I did it, custom designed projectiles using estes parts! I've just started getting back into it and only have one rocket now, but at one time I'd worked my way up to aerotech G64 engines.
I eventually catastrophically misfired that aerotech G engine, and it ripped itself out of the rocket sideways while opening the parachute on ascent at ~40ft. Turns out greasing those o-rings is important and I needed a checklist.
OMG yes, assembling motors needs a checklist. I left a component out of an I and got very lucky I didn't destroy the rocket.
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