I've never tired to use WC852, but the popular data indicates that it is close to IMR4831 in burn speed. However, there are two formulations of WC852, one is faster than the other and is closer to H380 burn rate. They are differentiated as WC852 and WC852f. You've got to know which one you have.
Google is your friend here. Start low, go slow, and be safe.