The J300 is a 7% J 38mm 5-grain reloadable composite motor from Cesaroni Technology Incorporated (CTI).
This motor uses an E-Match igniter.
This reload fits a Pro38-5G motor case.
CTI's Classic propellant burns cleanly with a mild flame and little smoke.
| Average Thrust: | 302.4070 N | 
| Casing: | Pro38-5G | 
| Certified By: | Tripoli Rocketry Association | 
| Class: | 7% J | 
| Delays: | 6,8,10,12,15 seconds | 
| Diameter: | 38.0000 mm | 
| Formula: | Classic | 
| Igniter: | E-Match | 
| Length: | 360.0000 mm | 
| Letter: | J | 
| Manufacturer: | CTI | 
| Name: | J300 | 
| Peak Thrust: | 436.5860 N | 
| Propellant: | APCP | 
| Status: | Out-Of-Production | 
| Thrust Duration: | 2.2700 s | 
| Total Impulse: | 687.9750 Ns | 
| Total Weight: | 606.5920 g | 
| Type: | Reloadable | 
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