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Rifles, Reloading, Optics, Equipment
Reloading
Help with new magneto speed numbers
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<blockquote data-quote="Tac-O" data-source="post: 1925077" data-attributes="member: 109994"><p>Here are some more numbers:</p><p></p><p></p><table style='width: 100%'><tr><td>charge</td><td>shot 1</td><td>shot 2</td><td>shot 3</td><td>shot 4</td><td>ES</td><td>SD</td></tr><tr><td>60.6</td><td>2905</td><td>2932</td><td>2912</td><td>2927</td><td>27</td><td>13</td></tr><tr><td>60.8</td><td>2918</td><td>2925</td><td>2924</td><td>2912</td><td>13</td><td>6</td></tr><tr><td>61</td><td>2934</td><td>2929</td><td>2962</td><td>2942</td><td>33</td><td>15</td></tr><tr><td>61.2</td><td>2972</td><td>2953</td><td>2954</td><td>2953</td><td>19</td><td>9</td></tr><tr><td>63</td><td>3017</td><td>2994</td><td>2951</td><td></td><td>66</td><td>34</td></tr><tr><td>63.1</td><td>3025</td><td>3024</td><td>3042</td><td></td><td>18</td><td>10</td></tr><tr><td>63.2</td><td>3033</td><td>3030</td><td>3040</td><td></td><td>10</td><td>5</td></tr><tr><td>63.3</td><td>3008</td><td>3033</td><td>3026</td><td></td><td>25</td><td>13</td></tr></table><p></p><p></p><p>I think there's a couple outliers in there due to issues I was having with my die which probably resulted in some inconsistent neck tension. Something I did notice, was that the case necks of 63.0-63.3 started looking a little cleaner. All the case necks of the lower charges were still very dirty. I will have to do some more annealing to see if this makes a difference, but I think it's likely just needing to hit higher pressure to get a good seal. Next time, I'll test 60.8, 61.0, and 63.2 for groups. </p><p></p><p>On this batch of brass, it was only neck sized and at it's maximum base to datum length. I'll have to bump the shoulders back before the next session. If my FL die is set to bump the shoulders back by 0.003, how will this affect my known velocity nodes and associated charges? Will I need to increase the charge by something like 0.1gr to hit the same velocity node since some of the pressure build will be going to stretching the brass?</p></blockquote><p></p>
[QUOTE="Tac-O, post: 1925077, member: 109994"] Here are some more numbers: [TABLE] [TR] [TD]charge[/TD] [TD]shot 1[/TD] [TD]shot 2[/TD] [TD]shot 3[/TD] [TD]shot 4[/TD] [TD]ES[/TD] [TD]SD[/TD] [/TR] [TR] [TD]60.6[/TD] [TD]2905[/TD] [TD]2932[/TD] [TD]2912[/TD] [TD]2927[/TD] [TD]27[/TD] [TD]13[/TD] [/TR] [TR] [TD]60.8[/TD] [TD]2918[/TD] [TD]2925[/TD] [TD]2924[/TD] [TD]2912[/TD] [TD]13[/TD] [TD]6[/TD] [/TR] [TR] [TD]61[/TD] [TD]2934[/TD] [TD]2929[/TD] [TD]2962[/TD] [TD]2942[/TD] [TD]33[/TD] [TD]15[/TD] [/TR] [TR] [TD]61.2[/TD] [TD]2972[/TD] [TD]2953[/TD] [TD]2954[/TD] [TD]2953[/TD] [TD]19[/TD] [TD]9[/TD] [/TR] [TR] [TD]63[/TD] [TD]3017[/TD] [TD]2994[/TD] [TD]2951[/TD] [TD][/TD] [TD]66[/TD] [TD]34[/TD] [/TR] [TR] [TD]63.1[/TD] [TD]3025[/TD] [TD]3024[/TD] [TD]3042[/TD] [TD][/TD] [TD]18[/TD] [TD]10[/TD] [/TR] [TR] [TD]63.2[/TD] [TD]3033[/TD] [TD]3030[/TD] [TD]3040[/TD] [TD][/TD] [TD]10[/TD] [TD]5[/TD] [/TR] [TR] [TD]63.3[/TD] [TD]3008[/TD] [TD]3033[/TD] [TD]3026[/TD] [TD][/TD] [TD]25[/TD] [TD]13[/TD] [/TR] [/TABLE] I think there's a couple outliers in there due to issues I was having with my die which probably resulted in some inconsistent neck tension. Something I did notice, was that the case necks of 63.0-63.3 started looking a little cleaner. All the case necks of the lower charges were still very dirty. I will have to do some more annealing to see if this makes a difference, but I think it's likely just needing to hit higher pressure to get a good seal. Next time, I'll test 60.8, 61.0, and 63.2 for groups. On this batch of brass, it was only neck sized and at it's maximum base to datum length. I'll have to bump the shoulders back before the next session. If my FL die is set to bump the shoulders back by 0.003, how will this affect my known velocity nodes and associated charges? Will I need to increase the charge by something like 0.1gr to hit the same velocity node since some of the pressure build will be going to stretching the brass? [/QUOTE]
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Help with new magneto speed numbers
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