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PostPosted: Fri Dec 14, 2018 8:54 am 
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I have a 338 Lapua which groups at 1/4 MOA.
The problem I am having with the rifle is that the Point of impact changes by 2 inch at 200m when the temperature goes below 10 degrees.

Does someone know what the problem might be and how I can fix it?


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PostPosted: Fri Dec 14, 2018 8:55 am 
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The groups however stay constant just move around with the temperature changes


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PostPosted: Fri Dec 14, 2018 9:08 am 
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Ek dink nie die probleem lĂȘ by jou geweer as sulks nie tensy daar 'n drukpunt tussen die kolf en die loop is.

Hoe stoor jy jou ammo tydens die tyd wat jy skiet?
Probeer om die ammo in 'n koelsak te hou en laai dan enkelskoot uit die sak. Ammo se temperatuur sal dan meer konstant bly.

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PostPosted: Fri Dec 14, 2018 9:42 am 
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What bullet/propellant are you using?

Have you measured muzzle velocity of the groups that impact low?

Image

Streloc simulation with temp sensitivity of 5.8 gives you more or less the change in POI.

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PostPosted: Wed Jan 16, 2019 4:27 pm 
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Thanks for your advice - the POI changes with temperature which is directly linked to the change in Velocity. Will try the Vihatavori to see whether it is more consitent


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