Team Icarus, a team under the SDSU Rocket Project, recently tested their in-house designed and built solid rocket motor. The motor is intended to launch a boosted dart to 100,000ft.
This particular motor was a 4″ dia (101.2mm) composite case, burning an APCP propellant blend, producing a chamber pressure of 760psi. The burn time was 5sec.
You can follow Team Icarus on Facebook to stay up to date on this project.