bcbert-4
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Looks for Range (1/11)
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I will do this and report back. Thanks everyone for all the suggestions.
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Accuracy is seems to be fine, but then again all the shooting in the KKM pro barrel has just been over the chrono so far.
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All Fed Brass. All once fired by me.
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Here is the latest data. I was using a 13# spring before, went back to the stock spring and guide rod which is 15 or 16 # Load # 1 S&W M&P9 PRO - Stock Barrel Berrys 147gr 9mm Federal Primer VV N320 3.6 GRN COL 1.142 HI 929 FPS / Lo 876 FPS / AVG 902.9 / ES 62.7 / SD 15.6 / AVG PF 132 Load #2 S&W M&P9 PRO - Stock Barrel Berrys 147gr 9mm Federal Primer VV N320 3.7 GRN COL 1.142 HI 930 FPS / Lo 865 FPS / AVG 902.9 / ES 64.9/ SD 16.7 / AVG PF 133 Load #3 S&W M&P9 PRO - KKM Barrel Berrys 147gr 9mm Federal Primer VV N320 3.6 GRN COL 1.142 HI 937 FPS / Lo 818 FPS / AVG 878 / ES 119.4 / SD 36.7 / AVG PF 129 Load #4 S&W M&P9 PRO - KKM Barrel Berrys 147gr 9mm Federal Primer VV N320 3.7 GRN COL 1.142 HI 921 FPS / Lo 838 FPS / AVG 871 / ES 83.1/ SD 18.5 / AVG PF 128 Any thoughts? what worries me with the KKM barrel is the randomness of the velocities and the shots that end up below min PF.
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I haven't seen any evidence of vertical stringing. I will try the original barrel and stock spring. Hopefully tomorrow or tuesday. Thanks for the help.
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Looking for some insight. My primary production class gun has been a S&W M&P9 with a KKM barrel installed. I have been loading for this gun for about a year with fantastic results. My standard load for it is: Berry's 147gr VV N320 3.6gr C.O.L. 1.1500 I make PF 130 all day long with a SD in the low teens. I have been very happy with this load and it has been consistent. I recently picked up a S&W M&P9 PRO and have also added a KKM barrel to it. With the same load, my results are all over the place. Velocity ranges from 900 fps down to 790 fps and SD is quite high. I thought it might be the batch of reloads, but they were right on the money when I fed them through the standard size M&P over the chrono. Any thoughts on how to adjust the load for the PRO series gun?