I see a drop in the climb rate...say for eg 1000/min to 700/min but of course it varies
Whilst the a/c is accelerating from 250 kt to enroute climb (say 300 kt) you would expect to see a reduction in rate of climb as the kinetic energy is increasing compared to potential energy (height gained) - once the enroute climb is established the rate of climb will increase again - as has been stated above the actual rate of climb depends on factors such as weight etc.