3/27/10 Shooting Chrony

Today I bought a Beta Master Shooting Chrony.  I tested some of my loads and here are the results.

(In hindsight, I didn't get a large enough sample for most of these shots, so take it with a grain of salt.  The 308 group was only 3 shots, 243 group was 4 shots.  In later tests I ran 8-10 shots in the string and I think that is a better way to show actual performance.)

Savage .308 168 gr Sierra BTHP Match 42 grains IMR 4064:
     Low: 2620
     High: 2634
     Avg: 2624
     Extreme Spread: 13.69
     Standard Deviation: 7.54

Savage .308 Winchester Super X 180 Gr.
     Low: 2665
     High: 2691
     Avg: 2677
     Extreme Spread: 26.67
     Standard Deviation: 11.53

Ruger .243 Hornady 105 gr A-Max 41 grains IMR 4350:
 
     Low: 2856
     High: 2916
     Avg: 2879
     Extreme Spread: 59.19
     Standard Deviation: 26.24

Ruger .243 Winchester Super X 100 gr soft point

     Low: 3033
     High: 3077
     Avg: 3049
     Extreme Spread: 43.94
     Standard Deviation: 16.67

AR-15 .223 PMC 55 gr FMJ  ???

     Low:2722
     High2770
     Avg: 2749
     Extreme Spread: 47.99
     Standard Deviation: 18.35