I have a Buckmaster 2000 a couple years old what is the max speed i can get from it doing everthing possible

Too many unknown variables here brother. Anyway, you should be able to see what the manufacturer says it will shoot IBO and what not. With my bow they advertised 300 fps at 30" and 60lbs. Every inch less seems to make about a 10 fps difference, and every pound over 1.5 difference. Of course, if you do the math you see that I rounded up my number below to the nearest 5. Make me feel tougher

Arrow weight and fletching type can make something of a difference also.