If you lose 10 lbs you will be lucky if 5 of that is fat. When you first start to cut there will be significant glycogen and water loss before you really start digging into fat stores.
At your estimate (and trust me, everyone estimates wrong the first real cut they do), you have 22.4 pounds of fat. Losing 10 pounds of bodyweight (with 5 being fat and 5 other), will leave you at:
214 lbs bodyweight, 17.4 lbs fat, 8% bodyfat.
You will not be stage ready even for a physique competition. You may want to revisit your strategy just based on your suggested numbers.