find a flat wall and moderate ammount of room between you and the wall. fire about 5 bullets into the wall at the same place. take your current senitivity and write it down. now mulitply your sensititvty by 2. you now have 2 numbers. take your original sensiitivity and divide it by 2. now you have 3 different numbers. your original. 1 -mulitpilied by 2 and another divided by 2. take each sensitivyt and try them both out. strafe left and right and keep your crosshair on the bullet hole best you can. After u feel youve decided which one you could keep on the bullet hole better take that number and add it to your orignal sensittvy. then divide that new number by 2. you now have a new number. Take that number mulitply by 2 and divide by 2 to make 2 more numbers. now test out each sens and repeat the process. When you think you cant decide between the higher or lower sen of which is better take those 2 numbers , add them together, and divide by 2. you now have your perfect sensitivty. make sure to round to the nearest thousanth