I have to agree with bigpappascout 100% start short until you start to get your form together ,when you start to consistantly put some group's together at 10yrds then move your pin to 20yrds and do the same ,once you start putting some group's together at this range, you can move on to your 2nd pin ,you could set it at 25yrds and work it to 30yrds as soon as your group's start to tighten up and then move to your next pin and use the same process for it .It won't take long and you'll have it set at 40yrds .

nubo