Sorry this is a question from a noob and I hope this belongs here. I am choosing a round for my Percision rifle....my question to you all is how do you go through the process.... what do you do to choose that perfect grain weight. Now just to preface this I will be using manufactured ammo most likely from Hornaday or Berger. The process I was going to use is Buying 300 WinMag from different manufacturers. Next process would be to chronograph the rounds comparing speeds extreme spreads And standard deviations. In my third process would be to analyze the groups. My question to you all is is this the correct process or what does everybody else do? Thank you in advance from a new guy.