Vihtavouri N560 - Temp Sensitive?

Discussion in 'Reloading' started by azsugarbear, Aug 31, 2009.

  1. azsugarbear

    azsugarbear Well-Known Member

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    Looking at reloading some 95 gr. bullets for my .243 Model 7. The Nosler manual lists Vihtavouri N560 powder as being the most accurate in their tests. Somehow, I remember reading that the Vihtavouri powders are great, but very temp sensitive. I live in AZ where the day can start at 65 degress but climb to 105 degrees within several hours, so this becomes a big factor for me. Does anybody have experience with this powder, especially regarding temp sensitivity?
     
  2. far east

    far east Member

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    Mar 27, 2009
    hi, i use n560 with 7rem and i have best results , no change with temp, for your 243win, temp 65°f,you have press chamber 3150 bar, for v928m/s
    temp 105°f you have 3400 press chamber for v 951m/s.
    i l live in south france , i have same temp contraints,in the morning 18°c =65
    afternoon 42°=115.
    i stop vitha N160 very instable with high temp ,so dangerous surpressions.i use this only winter.
     

  3. eddybo

    eddybo Well-Known Member

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    I found similarly, N160 bad swings, N560 no problems. N160 while more accurate in the f-class rifle I was using would shoot great 20 shot strings in the morning, but would sometimes pop a primers by the last string of the day. Since I switched to 560 I have had no problems and my scores increased.