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Rifles, Reloading, Optics, Equipment
Reloading
decision on chronograph
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<blockquote data-quote="MontanaRifleman" data-source="post: 855769" data-attributes="member: 11717"><p>The SuperChrono was inconsistent with the other two. I think the reason may have been because it was set up at 14' from the muzzles. After reading the directions more carefully, it is supposed to be set up 17' away from magnums and high velocity cartridges. The biggest inconsistencies were with the high velocity rounds. I did a little wright up on it in another Long Range forum which I'm pasting in below.</p><p></p><p>*********************</p><p></p><p>I processed the raw data that Broz recorded to calculate actual MV for the Oehler and SuperChrono. I threw out the first shot on the first string since the bayo had come loose. I added 9 fps to the Oehler readings and 8 fps to the SuperChrono readings to get actual muzzle velocites. Then I calculated the differences between the Oehler and Magneto and the Oehler and Super. Then I calculated the ES's for each string. I think the results were interesting.</p><p></p><p>ES' of the all the readings were fairly close, especially the last 3 strings.</p><p></p><p>The Super recorded lower readings than the Oehler with the 2 highest velocity strings. It recorded higher reading with the lower velocity strings.</p><p></p><p>The Magneto was the opposite of the above.</p><p></p><p>Both the Magneto and the Supper agreed more closely with the Oehler with the slower velocity strings with the Magneto being the closest.</p><p></p><p>The greatest Magneto/Oehler difference was 13 fps with many in the 1 fps category.</p><p></p><p>223</p><p> </p><p>Oehler........ Magneto................ Super ............ O>M......... O>S</p><p>3309..............error........ ...........3240 …………………………….... -69</p><p>3322..............3335......... ..........3230 …………….. +13…………. -92</p><p>3303..............3315......... ..........3256 …………….. +13…………. -47</p><p>3325..............3337......... ..........3259 …………….. +12…………. -67</p><p>23……........……..22……….......……….29</p><p> </p><p>6 BR</p><p> </p><p>2830..............2829......... ...........2859 …………….. -1………….+29</p><p>2833..............2832......... ...........2859 …………….. -1………….+26</p><p>2822..............2820......... ...........2839 …………….. -2………….+17</p><p>2814..............2810......... ...........2836 …………….. -4………….+22</p><p>2824..............2823......... ...........2849 …………….. -1………….+25</p><p>19……........……..22……..........………….23</p><p> </p><p>284 Win</p><p> </p><p>2843...............2837......... ...........2862…………….. -6………….+19</p><p>2851...............2855......... ...........2852 …………….. +4…………+1</p><p>2866...............2860......... ...........2878…………….. -6………….+11</p><p>2834...............2831......... ...........2845…………….. -3………….+11</p><p>2837...............2836......... ...........2865…………….. -1………….+28</p><p>32……........……..29………..........……….33 </p><p> </p><p>338 RUM</p><p> </p><p>3093...............3099......... ............3013…………….. +6………….-80</p><p>3109...............3117......... ............3036…………….. +8………….-73</p><p>3081...............3092......... ............3013…………….. +11…………-68</p><p>3097...............3105......... ............3009…………….. +8…………-88</p><p>3103...............3097......... ............3036…………….. -6………….-67</p><p>28…….........……..25……...........………….27</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 855769, member: 11717"] The SuperChrono was inconsistent with the other two. I think the reason may have been because it was set up at 14' from the muzzles. After reading the directions more carefully, it is supposed to be set up 17' away from magnums and high velocity cartridges. The biggest inconsistencies were with the high velocity rounds. I did a little wright up on it in another Long Range forum which I'm pasting in below. ********************* I processed the raw data that Broz recorded to calculate actual MV for the Oehler and SuperChrono. I threw out the first shot on the first string since the bayo had come loose. I added 9 fps to the Oehler readings and 8 fps to the SuperChrono readings to get actual muzzle velocites. Then I calculated the differences between the Oehler and Magneto and the Oehler and Super. Then I calculated the ES's for each string. I think the results were interesting. ES' of the all the readings were fairly close, especially the last 3 strings. The Super recorded lower readings than the Oehler with the 2 highest velocity strings. It recorded higher reading with the lower velocity strings. The Magneto was the opposite of the above. Both the Magneto and the Supper agreed more closely with the Oehler with the slower velocity strings with the Magneto being the closest. The greatest Magneto/Oehler difference was 13 fps with many in the 1 fps category. 223 Oehler........ Magneto................ Super ............ O>M......... O>S 3309..............error........ ...........3240 …………………………….... -69 3322..............3335......... ..........3230 …………….. +13…………. -92 3303..............3315......... ..........3256 …………….. +13…………. -47 3325..............3337......... ..........3259 …………….. +12…………. -67 23……........……..22……….......……….29 6 BR 2830..............2829......... ...........2859 …………….. -1………….+29 2833..............2832......... ...........2859 …………….. -1………….+26 2822..............2820......... ...........2839 …………….. -2………….+17 2814..............2810......... ...........2836 …………….. -4………….+22 2824..............2823......... ...........2849 …………….. -1………….+25 19……........……..22……..........………….23 284 Win 2843...............2837......... ...........2862…………….. -6………….+19 2851...............2855......... ...........2852 …………….. +4…………+1 2866...............2860......... ...........2878…………….. -6………….+11 2834...............2831......... ...........2845…………….. -3………….+11 2837...............2836......... ...........2865…………….. -1………….+28 32……........……..29………..........……….33 338 RUM 3093...............3099......... ............3013…………….. +6………….-80 3109...............3117......... ............3036…………….. +8………….-73 3081...............3092......... ............3013…………….. +11…………-68 3097...............3105......... ............3009…………….. +8…………-88 3103...............3097......... ............3036…………….. -6………….-67 28…….........……..25……...........………….27 [/QUOTE]
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