speed VS Pressure question

Discussion in 'Reloading' started by dragman, Apr 2, 2013.

  1. dragman

    dragman Well-Known Member

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    Dec 6, 2011
    In all my reloading exsperiences the closer to the max you get the more speed you gain as you add powder EXAMPLE:
    50 grains of powder gives you 2900FPS and for ever .5 grains you add 30-35fps until it gets close to max then it usually jumps so that your getting the same speed increase with .2 or .3 that you were with .5

    I found my guns sweet spot and it was up at max and it shoots REALLY well. but when the temp goes up I have to back it off a little to stay safe for me and the gun. My Max load is shooting 3125 FPS with 50.3 grains of powder. on the same day I found my sweet spot with a smaller charge of 49.0 grains and it chrono's 3085 FPS. I just don't understand how I can take a max load back it off 1.3 grains and it only dropped 40fps??? anyone have an answer or am I looking into this way to much??
     
  2. 375fan

    375fan Well-Known Member

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    May 3, 2010
    Quit over thinking it.:D If shooting good enjoy it. Over the years have seen some odd things in reloading, I think sometimes it is just the culmination of the combination of gun, barrel, caliber, bullet, powder, etc. that gives oddities to scratch our heads over.
     

  3. Lefty7mmstw

    Lefty7mmstw Well-Known Member

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    May 13, 2012
    Some combo's will plateau in velocity when you hit max. pressure. Powder burn often gets less efficient.
    375's right... quit overthinking it. Get a big enough caliber that you can allow for temp. swings in your loading and shoot the pipe.