Jason, I'm not familiar with china berry, but whenever you have some staves of a wood f unknown qualities as a bow,(especially a whitewood) build a bow 68" long 4" handle 2" fades 2" wide at the fades tapering to 1/2" tips. Go for 50# @ 28". If it makes a bow at that size that shoots well and shows little tendency to follow the string, make the next one 1 3/4" wide and 66" long.Again if it holds up well go for 1 1/2" wide and 64" long. Eventually you will find the limits of that wood which will show up in excessive string follow.