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Rifles, Reloading, Optics, Equipment
Reloading
300 PRC Initial Load development, Looking for input.
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<blockquote data-quote="Lovellr653" data-source="post: 1883480" data-attributes="member: 113949"><p>Hey Guys/Gals, I'm looking for your input on the data I've collected so far, as you'll see I managed a couple good groups but can't figure out a rhyme or reason to them. I gathered my velocity data using a basic chronograph at 10' and plotted on a line graph a few different ways looking for this "node" everyone talks about. My inexperienced eyes are giving me inconclusive results. I'll also note I am not a great shooter and this is my first time working with a magnum rifle/cartridge. There's already a lot of material but i can provide more background if requested. Here goes...</p><p></p><p><u>Rifle Info:</u></p><p>Christensen Arms MPR: 300 PRC, 26" Steel Barrel (I believe 1:8)</p><p>Vortex Razor HD Gen II 4-27x56</p><p>Atlas Bipod</p><p></p><p><u>Load Info:</u></p><p>Brass: Hornady, once fired, annealed </p><p>Primer: GM215M</p><p>Bullet: 225g ELD-Match</p><p>Seating: 0.030" off lands</p><p>Powder: Retumbo (I started at 75.0gr and worked up to 79.0gr in 0.5gr increments)</p><p></p><p>[ATTACH=full]189114[/ATTACH]This chart shows the 3 shot velocity average for each charge weight</p><p>[ATTACH=full]189115[/ATTACH]This chart shows the 1st shot velocity for each charge weight</p><p>[ATTACH=full]189116[/ATTACH]This chart shows the 2nd shot velocity for each charge weight</p><p>[ATTACH=full]189117[/ATTACH]This chart shows the 3rd shot velocity for each charge weight</p><table style='width: 100%'><tr><td>Cycle 1</td><td></td><td></td><td>Cycle 2</td><td></td><td></td><td>Cycle 3</td><td></td><td></td><td></td></tr><tr><td>grains</td><td>Velocity</td><td></td><td></td><td>grains</td><td>Velocity</td><td></td><td></td><td>grains</td><td>Velocity</td></tr><tr><td><div style="text-align: right">75</div> </td><td><div style="text-align: right">2693</div> </td><td></td><td></td><td><div style="text-align: right">75</div> </td><td><div style="text-align: right">2693</div> </td><td></td><td></td><td><div style="text-align: right">75</div> </td><td><div style="text-align: right">2710</div> </td></tr><tr><td><div style="text-align: right">75.5</div> </td><td><div style="text-align: right">2726</div> </td><td></td><td></td><td><div style="text-align: right">75.5</div> </td><td><div style="text-align: right">2726</div> </td><td></td><td></td><td><div style="text-align: right">75.5</div> </td><td><div style="text-align: right">2726</div> </td></tr><tr><td><div style="text-align: right">76</div> </td><td><div style="text-align: right">2749</div> </td><td></td><td></td><td><div style="text-align: right">76</div> </td><td><div style="text-align: right">2737</div> </td><td></td><td></td><td><div style="text-align: right">76</div> </td><td><div style="text-align: right">2743</div> </td></tr><tr><td><div style="text-align: right">76.5</div> </td><td><div style="text-align: right">2766</div> </td><td></td><td></td><td><div style="text-align: right">76.5</div> </td><td><div style="text-align: right">2766</div> </td><td></td><td></td><td><div style="text-align: right">76.5</div> </td><td><div style="text-align: right">2754</div> </td></tr><tr><td><div style="text-align: right">77</div> </td><td><div style="text-align: right">2777</div> </td><td></td><td></td><td><div style="text-align: right">77</div> </td><td><div style="text-align: right">2766</div> </td><td></td><td></td><td><div style="text-align: right">77</div> </td><td><div style="text-align: right">2766</div> </td></tr><tr><td><div style="text-align: right">77.5</div> </td><td><div style="text-align: right">2789</div> </td><td></td><td></td><td><div style="text-align: right">77.5</div> </td><td><div style="text-align: right">2772</div> </td><td></td><td></td><td><div style="text-align: right">77.5</div> </td><td><div style="text-align: right">2818</div> </td></tr><tr><td><div style="text-align: right">78</div> </td><td><div style="text-align: right">2824</div> </td><td></td><td></td><td><div style="text-align: right">78</div> </td><td><div style="text-align: right">2818</div> </td><td></td><td></td><td><div style="text-align: right">78</div> </td><td><div style="text-align: right">2818</div> </td></tr><tr><td><div style="text-align: right">78.5</div> </td><td><div style="text-align: right">2867</div> </td><td></td><td></td><td><div style="text-align: right">78.5</div> </td><td><div style="text-align: right">2849</div> </td><td></td><td></td><td><div style="text-align: right">78.5</div> </td><td><div style="text-align: right">2830</div> </td></tr><tr><td><div style="text-align: right">79</div> </td><td><div style="text-align: right">2867</div> </td><td></td><td></td><td><div style="text-align: right">79</div> </td><td><div style="text-align: right">2898</div> </td><td></td><td></td><td><div style="text-align: right">79</div> </td><td><div style="text-align: right">2898</div> </td></tr></table><p>At 79.0 Grains I got my first signs of pressure in the form of light ejector marks on the case head. </p><p></p><p>Provided pics are of my two best groups. The first being at 76.0 grains and the second at 78.5 grains.</p><p>[ATTACH=full]189118[/ATTACH]76.0 grains [ATTACH=full]189119[/ATTACH]78.5 grains</p><p></p><p>Thoughts, opinions, constructive criticism, questions....Any input is welcome.</p></blockquote><p></p>
[QUOTE="Lovellr653, post: 1883480, member: 113949"] Hey Guys/Gals, I'm looking for your input on the data I've collected so far, as you'll see I managed a couple good groups but can't figure out a rhyme or reason to them. I gathered my velocity data using a basic chronograph at 10' and plotted on a line graph a few different ways looking for this "node" everyone talks about. My inexperienced eyes are giving me inconclusive results. I'll also note I am not a great shooter and this is my first time working with a magnum rifle/cartridge. There's already a lot of material but i can provide more background if requested. Here goes... [U]Rifle Info:[/U] Christensen Arms MPR: 300 PRC, 26" Steel Barrel (I believe 1:8) Vortex Razor HD Gen II 4-27x56 Atlas Bipod [U]Load Info:[/U] Brass: Hornady, once fired, annealed Primer: GM215M Bullet: 225g ELD-Match Seating: 0.030" off lands Powder: Retumbo (I started at 75.0gr and worked up to 79.0gr in 0.5gr increments) [ATTACH type="full"]189114[/ATTACH]This chart shows the 3 shot velocity average for each charge weight [ATTACH type="full"]189115[/ATTACH]This chart shows the 1st shot velocity for each charge weight [ATTACH type="full"]189116[/ATTACH]This chart shows the 2nd shot velocity for each charge weight [ATTACH type="full"]189117[/ATTACH]This chart shows the 3rd shot velocity for each charge weight [TABLE] [TR] [TD]Cycle 1[/TD] [TD][/TD] [TD][/TD] [TD]Cycle 2[/TD] [TD][/TD] [TD][/TD] [TD]Cycle 3[/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD]grains[/TD] [TD]Velocity[/TD] [TD][/TD] [TD][/TD] [TD]grains[/TD] [TD]Velocity[/TD] [TD][/TD] [TD][/TD] [TD]grains[/TD] [TD]Velocity[/TD] [/TR] [TR] [TD][RIGHT]75[/RIGHT][/TD] [TD][RIGHT]2693[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]75[/RIGHT][/TD] [TD][RIGHT]2693[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]75[/RIGHT][/TD] [TD][RIGHT]2710[/RIGHT][/TD] [/TR] [TR] [TD][RIGHT]75.5[/RIGHT][/TD] [TD][RIGHT]2726[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]75.5[/RIGHT][/TD] [TD][RIGHT]2726[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]75.5[/RIGHT][/TD] [TD][RIGHT]2726[/RIGHT][/TD] [/TR] [TR] [TD][RIGHT]76[/RIGHT][/TD] [TD][RIGHT]2749[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]76[/RIGHT][/TD] [TD][RIGHT]2737[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]76[/RIGHT][/TD] [TD][RIGHT]2743[/RIGHT][/TD] [/TR] [TR] [TD][RIGHT]76.5[/RIGHT][/TD] [TD][RIGHT]2766[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]76.5[/RIGHT][/TD] [TD][RIGHT]2766[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]76.5[/RIGHT][/TD] [TD][RIGHT]2754[/RIGHT][/TD] [/TR] [TR] [TD][RIGHT]77[/RIGHT][/TD] [TD][RIGHT]2777[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]77[/RIGHT][/TD] [TD][RIGHT]2766[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]77[/RIGHT][/TD] [TD][RIGHT]2766[/RIGHT][/TD] [/TR] [TR] [TD][RIGHT]77.5[/RIGHT][/TD] [TD][RIGHT]2789[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]77.5[/RIGHT][/TD] [TD][RIGHT]2772[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]77.5[/RIGHT][/TD] [TD][RIGHT]2818[/RIGHT][/TD] [/TR] [TR] [TD][RIGHT]78[/RIGHT][/TD] [TD][RIGHT]2824[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]78[/RIGHT][/TD] [TD][RIGHT]2818[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]78[/RIGHT][/TD] [TD][RIGHT]2818[/RIGHT][/TD] [/TR] [TR] [TD][RIGHT]78.5[/RIGHT][/TD] [TD][RIGHT]2867[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]78.5[/RIGHT][/TD] [TD][RIGHT]2849[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]78.5[/RIGHT][/TD] [TD][RIGHT]2830[/RIGHT][/TD] [/TR] [TR] [TD][RIGHT]79[/RIGHT][/TD] [TD][RIGHT]2867[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]79[/RIGHT][/TD] [TD][RIGHT]2898[/RIGHT][/TD] [TD][/TD] [TD][/TD] [TD][RIGHT]79[/RIGHT][/TD] [TD][RIGHT]2898[/RIGHT][/TD] [/TR] [/TABLE] At 79.0 Grains I got my first signs of pressure in the form of light ejector marks on the case head. Provided pics are of my two best groups. The first being at 76.0 grains and the second at 78.5 grains. [ATTACH type="full" width="397px"]189118[/ATTACH]76.0 grains [ATTACH type="full" width="303px"]189119[/ATTACH]78.5 grains Thoughts, opinions, constructive criticism, questions....Any input is welcome. [/QUOTE]
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300 PRC Initial Load development, Looking for input.
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