nickbfishn Posted June 20, 2017 Share Posted June 20, 2017 9mm 147 bayou bullets 1.130 oal mixed brass cci primers n320 2.8/2.9/3.0 16" barrel Ati milsport so today the 3 loads were tested. Prior to changing each powder level the loader was cycled several times than the grains measured 3x for accuracy. 2.8 of n320 ran a pf averaged to 130.6 2.9 of n320 ran a pf of 137 heres where things get weird... 3.0 of n320 ran a pf of 137.8 and with all rounds the brass is wicked dirty afterwards Link to comment
jlo86cj Posted June 20, 2017 Share Posted June 20, 2017 Sounds about right. I ran my production load through an ATI and got 141. Its 3.2 gr of n320 with an acme 147 at 1.100". How many rounds are you running through the chrono for your average? Link to comment
v1911 Posted June 20, 2017 Share Posted June 20, 2017 If you're running a Dillon press, it can vary as much as .1gr per throw. Also, mixed brass will have an effect on consistency. Link to comment
nickbfishn Posted June 21, 2017 Author Share Posted June 21, 2017 14 hours ago, jlo86cj said: Sounds about right. I ran my production load through an ATI and got 141. Its 3.2 gr of n320 with an acme 147 at 1.100". How many rounds are you running through the chrono for your average? 3 strings of 5 Link to comment
nickbfishn Posted June 21, 2017 Author Share Posted June 21, 2017 14 hours ago, v1911 said: If you're running a Dillon press, it can vary as much as .1gr per throw. Also, mixed brass will have an effect on consistency. True on the Dillon, and the brass was mixed, but it was once fired and ultrasonic cleaned and no military Link to comment
gatortommy Posted June 21, 2017 Share Posted June 21, 2017 14 hours ago, v1911 said: If you're running a Dillon press, it can vary as much as .1gr per throw. Also, mixed brass will have an effect on consistency. This. Internal case volumes vary greatly by manufacturer. Different case volumes will vary pressure. If you want precision, I'd start by using same headstamp brass for your testing. Link to comment
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