Did my L3 with a Wildman Darkstar Extreme and it went about 14.4k AGL on a M1780T (
https://www.rocketryforum.com/threa...d-wildman-darkstar-extreme.57738/#post-604828). All told, my DSE has flown on three M motors, all went over 14k AGL, all went out of sight, and all required a tracker to recover. A lower, subsonic cert flight would be lower risk and in some ways more enjoyable to watch. YMMV.
If I were to do it all over again, I would buy a 5" or 6" project instead, like a Wildman Drago 5", Demon 5" or a smaller 6" using HED like the Demon 150 or Drago 6" (smaller is easier to transport & carry). Black Saturday and such sales are your friend if you can wait.