Japanese Ho-203 37 mm Cannon - What was the firerate?

Every since Update 1.99, when the Ho-203 37 mm autocannon had its rate of fire increased from 120 rounds/min to 300 rounds/min, I’ve been wonder as to the historicity of the new firerate. So far, I haven’t found a single source in my online search that mentions a 300 rounds/min firerate for the Ho-203; every source I’ve found states that the firerate was 120 rounds/min.

Does anyone have any information regarding this?

Yeah that’s definitely not correct. The Ho-203 had a modest ROF of about 120rpm.