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300 PRC Velocity decreases every 100 rounds

Dry powder will be faster, so no
Like i said the powder i loaded the last tome with was freshly opened with more moisture
 
Mahziar said:
It wasn’t the same cbto, due to throat erosion I had to increase the length
From first to the third test it was about 0.030 difference in cbto
I will send you the excel sheet
Thank you
Click to expand...
Sounds like you’ve found your culprit.
 
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