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Re: Reloading help for .270 Win
Quote:
Originally Posted by John Galt
Please explain "velocity spreads"..........What is the barrel twist on the 165/175 grain Matrix VLD's?
Thanks
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Matrix recommends 1:9 for 165gr and 1:8 for the 175gr. I have a 30" barrel with 1:8 and getting these results while fire-forming brass to AIs:
165gr = 2981 FPS, SD = 17 FPS
175gr = 2919, SD = 16 FPS
see post #10 of My budget .270 AI ...
I use this to calculate my SD ...
Standard Deviation Calculator
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