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Rifles, Reloading, Optics, Equipment
Reloading
7mm Mag Norma Brass, too soft?
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<blockquote data-quote="wbm" data-source="post: 1009099" data-attributes="member: 14158"><p>It is indeed. Seems to me your problem may not be Norma brass but expectations. You have a rifle that is very accurate at certain velocity projectile combinations but you are not satisfied with the velocity so you up your powder charge rates to get more speed. When you do that you end up with serious extraction and accuracy problems. First of all you are putting the Bergers against the lands. This results in higher pressure spikes....sometimes very high pressure spikes. With high volumes of slow powder don't use non magnum primers....using non magnum primers in itself can sometimes cause pressure problems. Second you are assuming that you have a "normal" Remington barrel and chamber. You may not have that....you may have a tighter than average chamber and bore....nothing wrong with that it just means you have to adjust your loads and expectations of velocity accordingly. </p><p></p><p>Finally, a 168gr Berger VLD with a G7 BC=.313 moving at 2850fps (at sea level) is one flat shooting mutha and still has sufficient velocity and energy to drop a pachyderm at 800 yards! That gets it done for me. </p><p></p><p>The 7mm Remington Magnum is my favorite all around do it all cartridge. I have a Savage 110 with a 26" Criterion barrel that will shoot extremely well with 160gr Sierra Game Kings....the velocity is about 2900 fps and three shot groups commonly average less than .30"....why would I want more velocity at the expense of accuracy? To me, in long range shooting speed is important accuracy is everything. Personally I think you have a pretty outstanding rifle.</p></blockquote><p></p>
[QUOTE="wbm, post: 1009099, member: 14158"] It is indeed. Seems to me your problem may not be Norma brass but expectations. You have a rifle that is very accurate at certain velocity projectile combinations but you are not satisfied with the velocity so you up your powder charge rates to get more speed. When you do that you end up with serious extraction and accuracy problems. First of all you are putting the Bergers against the lands. This results in higher pressure spikes....sometimes very high pressure spikes. With high volumes of slow powder don't use non magnum primers....using non magnum primers in itself can sometimes cause pressure problems. Second you are assuming that you have a "normal" Remington barrel and chamber. You may not have that....you may have a tighter than average chamber and bore....nothing wrong with that it just means you have to adjust your loads and expectations of velocity accordingly. Finally, a 168gr Berger VLD with a G7 BC=.313 moving at 2850fps (at sea level) is one flat shooting mutha and still has sufficient velocity and energy to drop a pachyderm at 800 yards! That gets it done for me. The 7mm Remington Magnum is my favorite all around do it all cartridge. I have a Savage 110 with a 26" Criterion barrel that will shoot extremely well with 160gr Sierra Game Kings....the velocity is about 2900 fps and three shot groups commonly average less than .30"....why would I want more velocity at the expense of accuracy? To me, in long range shooting speed is important accuracy is everything. Personally I think you have a pretty outstanding rifle. [/QUOTE]
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7mm Mag Norma Brass, too soft?
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