standard deviation

  1. Shot my first load development, results not great

    I am new to reloading for precision rifle. The rifle is a ruger precision rifle in 6.5CM. I watched a bunch of ultimate reloader's videos on load development and followed it to the best as I could and my numbers weren't that good. Is there something I'm not taking into consideration that can...

  2. Std Dev question

    Are there any other factors besides the consistency of the brass that contribute to low standard deviation? I'm trying to work up accurate .223 loads. Between two different factory loads and my reloads, I'm getting a similarly high std. dev. of about 25. SIG match grade gave me 15 for a 5...

  3. Pistol Good SD numbers

    What do you expect or consider a good and decent range for standard deviations on a pistol cartridge? I have been watching a bunch of reloading videos and powder reviews, with most loads having sd numbers way over a hundred. I have also watched some factory loads over a crono be about 15-20...

  4. Extreme Spread, Standard Deviation

    After reading a few of the threads here, there are three things that strike me when considering the standard deviation and extreme spread of muzzle velocities when reloading. One is that they do not measure accuracy, they measure consistency. (Some have called it precision.) Two is that while...

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