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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Mega
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<blockquote data-quote="cmcshooter" data-source="post: 2852946" data-attributes="member: 127179"><p>I have lurked and never posted, but Rich suggested I share all my data for the 338 Mega. I'm including all my powder tested, charges, and velocitiese. I'll also include a chart that might be close to accurate for energy and velocities, etc. My final loads for the 250 Berger OTM and the 250 SBD2 are at the end. FYI, I am on my 18th firing for my first 16 pieces of brass. This is exceptional brass life given the performance I'm getting out of my final loads. Hope this helps. </p><p></p><p>338 Sherman Mega</p><p>ADG Sherman 300 Mega Brass CCI 250 Primer</p><p>Case Length after Necking up=2.147 Case Length after Fire Forming-2.137</p><p>Fire Formed with 64 gr. RL19 (2540 FPS) with Spear 225 gr. Bullet jammed at .020"</p><p></p><p>Final Neck tension is .004 (364 bushing)</p><p></p><p></p><p><u>Pressure Testing</u></p><p>250 Berger OTM (.010" off lands) RL26</p><table style='width: 100%'><tr><td>75 gr.</td><td>2886</td></tr><tr><td>75.5</td><td>2892</td></tr><tr><td>76</td><td>2917</td></tr><tr><td>76.5</td><td>2955</td></tr><tr><td>77</td><td>2918</td></tr><tr><td>77.5</td><td>2928-No pressure but load feels compressed but not pushing the bullet out.</td></tr></table><p></p><p>250 Super Bulldozer 2 H4350</p><table style='width: 100%'><tr><td>65</td><td><div style="text-align: right">2707</div> </td></tr><tr><td>65.5</td><td><div style="text-align: right">2708</div> </td></tr><tr><td>66</td><td><div style="text-align: right">2738</div> </td></tr><tr><td>66.5</td><td><div style="text-align: right">2753</div> </td></tr><tr><td>67</td><td><div style="text-align: right">2770</div> </td></tr><tr><td>67.5</td><td><div style="text-align: right">2772</div> </td></tr><tr><td>68</td><td><div style="text-align: right">2789</div> </td></tr><tr><td>68.5</td><td><div style="text-align: right">2794</div> </td></tr><tr><td>69</td><td><div style="text-align: right">2820</div> </td></tr><tr><td>69.5</td><td><div style="text-align: right">2854</div> </td></tr><tr><td>70</td><td><div style="text-align: right">2861</div> </td></tr><tr><td>70.5</td><td><div style="text-align: right">2864</div> </td></tr><tr><td>71</td><td><div style="text-align: right">2909</div> </td></tr></table><p></p><p>250 Super Bulldozer 2 N550</p><table style='width: 100%'><tr><td>68</td><td>2892</td></tr><tr><td>68.5</td><td>2914</td></tr><tr><td>69</td><td>2918</td></tr><tr><td>69.5</td><td>2939</td></tr><tr><td>70</td><td>2943</td></tr><tr><td>70.5</td><td>2963</td></tr><tr><td>71</td><td>3003-Pressure Signs</td></tr></table><p></p><p>338 Sherman Mega 1000 Yard Data (250 Super Bulldozer 2)</p><p></p><p></p><p></p><table style='width: 100%'><tr><td><strong>Muzzle Vel</strong></td><td><strong>1K Vel</strong></td><td><strong>1K Energy</strong></td><td><strong>1K MOA</strong></td><td><strong>Supersonic (roughly)</strong></td></tr><tr><td>2770</td><td>1869</td><td>1939</td><td>24.6</td><td>1900</td></tr><tr><td>2800</td><td>1891</td><td>1986</td><td>24.0</td><td>1900</td></tr><tr><td>2850</td><td>1931</td><td>2072</td><td>23.0</td><td>1950</td></tr><tr><td>2900</td><td>1973</td><td>2159</td><td>22.1</td><td>2000</td></tr><tr><td>2950</td><td>2013</td><td>2249</td><td>21.3</td><td>2050</td></tr><tr><td>3000</td><td>2053</td><td>2341</td><td>20.5</td><td>2100</td></tr></table><p></p><p></p><p>Here are my final loads, but at least the info above can let you see the ballpark velocities for a few different powders with two different bullets. </p><p><strong><u>338 Sherman Mega (250 Berger OTM)</u></strong></p><p> <strong>250 Berger OTM</strong></p><p> <strong>ADG Brass</strong></p><p> <strong>Case Length=2.139"</strong></p><p> <strong>Shoulder set at 1.767" with E-420 Gauge</strong></p><p> <strong>Ogive=2.265" (.110" Off Lands)</strong></p><p> <strong>CCI 250 Primer</strong></p><p> <strong>68.5 gr. N550 @ 2940 fps</strong></p><p> <strong></strong></p><p> <strong></strong></p><p><strong><u>338 Sherman Mega (250 SBD2)</u></strong></p><p> <strong>250 Super Bulldozer 2</strong></p><p> <strong>ADG Brass</strong></p><p> <strong>Case Length=2.139"</strong></p><p> <strong>Shoulder set at 1.767" with E-420 Gauge</strong></p><p> <strong>Ogive=2.283" (.090" Off Lands)</strong></p><p> <strong>CCI 250 Primer</strong></p><p> <strong>67.8 gr. N550 @ 2860 fps</strong></p></blockquote><p></p>
[QUOTE="cmcshooter, post: 2852946, member: 127179"] I have lurked and never posted, but Rich suggested I share all my data for the 338 Mega. I'm including all my powder tested, charges, and velocitiese. I'll also include a chart that might be close to accurate for energy and velocities, etc. My final loads for the 250 Berger OTM and the 250 SBD2 are at the end. FYI, I am on my 18th firing for my first 16 pieces of brass. This is exceptional brass life given the performance I'm getting out of my final loads. Hope this helps. 338 Sherman Mega ADG Sherman 300 Mega Brass CCI 250 Primer Case Length after Necking up=2.147 Case Length after Fire Forming-2.137 Fire Formed with 64 gr. RL19 (2540 FPS) with Spear 225 gr. Bullet jammed at .020" Final Neck tension is .004 (364 bushing) [U]Pressure Testing[/U] 250 Berger OTM (.010" off lands) RL26 [TABLE] [TR] [TD]75 gr.[/TD] [TD]2886[/TD] [/TR] [TR] [TD]75.5[/TD] [TD]2892[/TD] [/TR] [TR] [TD]76[/TD] [TD]2917[/TD] [/TR] [TR] [TD]76.5[/TD] [TD]2955[/TD] [/TR] [TR] [TD]77[/TD] [TD]2918[/TD] [/TR] [TR] [TD]77.5[/TD] [TD]2928-No pressure but load feels compressed but not pushing the bullet out.[/TD] [/TR] [/TABLE] 250 Super Bulldozer 2 H4350 [TABLE] [TR] [TD]65[/TD] [TD][RIGHT]2707[/RIGHT][/TD] [/TR] [TR] [TD]65.5[/TD] [TD][RIGHT]2708[/RIGHT][/TD] [/TR] [TR] [TD]66[/TD] [TD][RIGHT]2738[/RIGHT][/TD] [/TR] [TR] [TD]66.5[/TD] [TD][RIGHT]2753[/RIGHT][/TD] [/TR] [TR] [TD]67[/TD] [TD][RIGHT]2770[/RIGHT][/TD] [/TR] [TR] [TD]67.5[/TD] [TD][RIGHT]2772[/RIGHT][/TD] [/TR] [TR] [TD]68[/TD] [TD][RIGHT]2789[/RIGHT][/TD] [/TR] [TR] [TD]68.5[/TD] [TD][RIGHT]2794[/RIGHT][/TD] [/TR] [TR] [TD]69[/TD] [TD][RIGHT]2820[/RIGHT][/TD] [/TR] [TR] [TD]69.5[/TD] [TD][RIGHT]2854[/RIGHT][/TD] [/TR] [TR] [TD]70[/TD] [TD][RIGHT]2861[/RIGHT][/TD] [/TR] [TR] [TD]70.5[/TD] [TD][RIGHT]2864[/RIGHT][/TD] [/TR] [TR] [TD]71[/TD] [TD][RIGHT]2909[/RIGHT][/TD] [/TR] [/TABLE] 250 Super Bulldozer 2 N550 [TABLE] [TR] [TD]68[/TD] [TD]2892[/TD] [/TR] [TR] [TD]68.5[/TD] [TD]2914[/TD] [/TR] [TR] [TD]69[/TD] [TD]2918[/TD] [/TR] [TR] [TD]69.5[/TD] [TD]2939[/TD] [/TR] [TR] [TD]70[/TD] [TD]2943[/TD] [/TR] [TR] [TD]70.5[/TD] [TD]2963[/TD] [/TR] [TR] [TD]71[/TD] [TD]3003-Pressure Signs[/TD] [/TR] [/TABLE] 338 Sherman Mega 1000 Yard Data (250 Super Bulldozer 2) [TABLE] [TR] [TD][B]Muzzle Vel[/B][/TD] [TD][B]1K Vel[/B][/TD] [TD][B]1K Energy[/B][/TD] [TD][B]1K MOA[/B][/TD] [TD][B]Supersonic (roughly)[/B][/TD] [/TR] [TR] [TD]2770[/TD] [TD]1869[/TD] [TD]1939[/TD] [TD]24.6[/TD] [TD]1900[/TD] [/TR] [TR] [TD]2800[/TD] [TD]1891[/TD] [TD]1986[/TD] [TD]24.0[/TD] [TD]1900[/TD] [/TR] [TR] [TD]2850[/TD] [TD]1931[/TD] [TD]2072[/TD] [TD]23.0[/TD] [TD]1950[/TD] [/TR] [TR] [TD]2900[/TD] [TD]1973[/TD] [TD]2159[/TD] [TD]22.1[/TD] [TD]2000[/TD] [/TR] [TR] [TD]2950[/TD] [TD]2013[/TD] [TD]2249[/TD] [TD]21.3[/TD] [TD]2050[/TD] [/TR] [TR] [TD]3000[/TD] [TD]2053[/TD] [TD]2341[/TD] [TD]20.5[/TD] [TD]2100[/TD] [/TR] [/TABLE] Here are my final loads, but at least the info above can let you see the ballpark velocities for a few different powders with two different bullets. [B][U]338 Sherman Mega (250 Berger OTM)[/U] 250 Berger OTM ADG Brass Case Length=2.139" Shoulder set at 1.767" with E-420 Gauge Ogive=2.265" (.110" Off Lands) CCI 250 Primer 68.5 gr. N550 @ 2940 fps [U]338 Sherman Mega (250 SBD2)[/U] 250 Super Bulldozer 2 ADG Brass Case Length=2.139" Shoulder set at 1.767" with E-420 Gauge Ogive=2.283" (.090" Off Lands) CCI 250 Primer 67.8 gr. N550 @ 2860 fps[/B] [/QUOTE]
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