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#87 – AP CH6: Muzzle Velocity Effects

#87 - AP CH6: Muzzle Velocity Effects

01:00:21  | Accuracy and Precision Chapter 6 covers Muzzle Velocity effects. Bryan and Francis talk about various aspects of muzzle velocity that affect your hit percentage on target.  For example: How much does an extra 100 fps in average Muzzle Velocity improve your hit percentage on an IPSC target at 1000 yards and 1200 yards?  Also, how is your hit percentage affected as the Standard Deviation (SD) of your ammo goes from 10 to 15 to 20 fps on various targets at all ranges?  These questions are explored with analysis from the book as well as other related experiences from precision rifle competitions.

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  • John Frost says:

    Another very informative podcast! Especially enjoyed the discussion on twist rate vs environmental variables. Seems like a way to set the minimum twist rate…. is there a maximum limit?

  • Mohamed Ayob says:

    How does precision and muzzle velocity statistical indicators relate , is rifle precision based on SDs and the vertical spread based on that , and what dictates your distribution on target at distance, MV or Precision?

    • Francis Colon says:

      Hi Mohamed, this is a good question and is very closely related to the TOP Gun Theory in Modern Advancements Volume 3. The general link for a given system configuration is that higher speed will yield lower precision (worse groups). However, this is only a general rule and we have not directly tested long term effects of moderate MV changes and their effect on precision. In my personal experience, I have found that lower muzzle velocities produce much more consistent precision than higher charges in cases like the 6 Dasher, 65CM and 308.


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