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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Build advice for a modern safari rifle
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<blockquote data-quote="Nitroexpress" data-source="post: 737631" data-attributes="member: 47344"><p><u><strong>These are the loads I have been working on for the 7mm RUM:-</strong></u></p><p></p><ul> <li data-xf-list-type="ul">All loads are with Berger 180gr VLD's</li> </ul><p><em>I'm a big fan of Berger and I built this rifle especially to benefit from thier .659 high BC offering.</em></p><p> </p><p>The photo is with Retumbo - (I did a bit of research and it came up as a good mag / ultra mag powder)</p><p></p><ul> <li data-xf-list-type="ul">Nosler custom brass - new</li> <li data-xf-list-type="ul">Fed GM215M primmers - Large rifle-magnum-match</li> <li data-xf-list-type="ul">Berger 7mm 180gr VLD</li> </ul><p>.284" Ogive to the land was 3.3920" ~ my loads were seated 3.1410" </p><p>(251 tho freebore) this gave me what I felt was 'enough' bullet in the case mouth.</p><p> </p><p><strong><u>Powder Charges:-</u></strong></p><p> </p><p>Picutres Shown ~ <strong>Retumbo 86gr</strong> - this was the max charge!</p><p> </p><p><strong>Vitavori N170</strong> <strong>89gr</strong> faired much the same - I carefully loaded that way over the max and still got sooting (the max was 87gr - I loaded upto 89gr and still got sooting) Velocity was also very poor - around 3000fps</p><p> </p><p>I was hoping for 3100 -3200fps range (the rifle has a 32" barrel and I thought the cartridge is capable of much more - my friend loads a factory rifle in 30-06 with 180gr bullets nearly upto that speed with no issues - 2990 fps) </p><p> </p><p>I did beter with Vitavori N165 but its not listed on Walts data - the fastest powder he lists is H1000 at a burn rate of 118</p><p> </p><p><u>Powder Burn Rates:-</u></p><p> </p><p><strong>N170</strong> ~123 (heavy sooting)</p><p> </p><p><strong>Retumbo</strong> ~ 121 (very heavy sooting)</p><p> </p><p>Reloader 25 ~ 120</p><p> </p><p>H1000 ~ 118</p><p> </p><p>IMR7828 ~ 116 </p><p> </p><p>Reloader 22 ~ 113 (great in my .300wm loads)</p><p> </p><p><strong>N165</strong> ~ 112* this powder worked o.k, <em>I wanted to try some others but I may have to go back to using it if I dont get anywhere.</em></p><p> </p><p>With regards to the photo:-</p><p></p><ul> <li data-xf-list-type="ul">Crattering of the primer - is that high pressure?</li> <li data-xf-list-type="ul">Plunger mark on the head - is that high pressure?</li> <li data-xf-list-type="ul">Sooting to that level - is that really low pressure?</li> </ul><p>Is the fact the case is not expanding hard enough because of low pressue it is not gripping in the chamber and causing these misleading high pressure signs?</p></blockquote><p></p>
[QUOTE="Nitroexpress, post: 737631, member: 47344"] [U][B]These are the loads I have been working on for the 7mm RUM:-[/B][/U] [LIST] [*]All loads are with Berger 180gr VLD's [/LIST][I]I'm a big fan of Berger and I built this rifle especially to benefit from thier .659 high BC offering.[/I] The photo is with Retumbo - (I did a bit of research and it came up as a good mag / ultra mag powder) [LIST] [*]Nosler custom brass - new [*]Fed GM215M primmers - Large rifle-magnum-match [*]Berger 7mm 180gr VLD [/LIST].284" Ogive to the land was 3.3920" ~ my loads were seated 3.1410" (251 tho freebore) this gave me what I felt was 'enough' bullet in the case mouth. [B][U]Powder Charges:-[/U][/B] Picutres Shown ~ [B]Retumbo 86gr[/B] - this was the max charge! [B]Vitavori N170[/B] [B]89gr[/B] faired much the same - I carefully loaded that way over the max and still got sooting (the max was 87gr - I loaded upto 89gr and still got sooting) Velocity was also very poor - around 3000fps I was hoping for 3100 -3200fps range (the rifle has a 32" barrel and I thought the cartridge is capable of much more - my friend loads a factory rifle in 30-06 with 180gr bullets nearly upto that speed with no issues - 2990 fps) I did beter with Vitavori N165 but its not listed on Walts data - the fastest powder he lists is H1000 at a burn rate of 118 [U]Powder Burn Rates:-[/U] [B]N170[/B] ~123 (heavy sooting) [B]Retumbo[/B] ~ 121 (very heavy sooting) Reloader 25 ~ 120 H1000 ~ 118 IMR7828 ~ 116 Reloader 22 ~ 113 (great in my .300wm loads) [B]N165[/B] ~ 112* this powder worked o.k, [I]I wanted to try some others but I may have to go back to using it if I dont get anywhere.[/I] With regards to the photo:- [LIST] [*]Crattering of the primer - is that high pressure? [*]Plunger mark on the head - is that high pressure? [*]Sooting to that level - is that really low pressure? [/LIST]Is the fact the case is not expanding hard enough because of low pressue it is not gripping in the chamber and causing these misleading high pressure signs? [/QUOTE]
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