In this video, Rex walks you through the process of logging your muzzle velocity variation (MVV) due to varying bore conditions and ammunition temperature variations. If you do not have access to Microsoft EXCEL, you may have to do this by hand. Either way, this video gives you the information you need to get started. The graph produced by this calculator will be the first page of your ballistics tables and will be used every time you calculate a new firing solution in the field. Failure to account for your MVV in the field will undoubtedly throw you off target. Evan at medium ranges, MVV due to ammo temperature can be huge! Your MV can change by over 200 fps due to varying ammo temperatures, and that will obviously have to be accounted for. NOTE: Even with the use of propellants designed to have limited burn rate changes over different temperatures, MVV due to ammo temperature will STILL exist due to numerous other factors (see previous video). Below is the link to the Ammo Temp MV Curve TABLES by TiborasaurusRex: https://docs.google.com/file/d/0Bzvx3RuRX1QTNzBkV3R2UE14WDA/edit?usp=sharing DOWNLOAD THE CURRENT VERSION by hitting the downward pointing arrow at the top left of the page and OPEN or SAVE the document so you can use it. This calculator was created on Microsoft Excel by TiborasaurusRex using brn rate data obtained from the "Ammunition Burn Rate Conversion Chart" figure in the book titled: "The Complete .50-Caliber Sniper Course Hard Target Interdiction" by Dean Michaelis, pages 175 and 176. ISBN 1-58160-068-2 This book is a great source of information, be sure to check it out at www.paladin-press.com All the music in this video was created by TiborasaurusRex, an unsigned artist. Song Title: Wadi Watir, Minefield Music and Lyrics by: TiborasaurusRex Instrumentation and Vocals by: TiborasaurusRex Recorded by: TiborasaurusRex