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Rifles, Reloading, Optics, Equipment
Reloading
Tough Choice On Powder Selection 6.5 Crreedmoor
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<blockquote data-quote="Darkker" data-source="post: 1170649" data-attributes="member: 81406"><p>,So remember that lot variation CAN be very large, there is a real reason why the "drop 10%" warning when switching lots is there.</p><p>My first 8# of Superformance was slower than book data, my second was a wee faster, and this third is well slower. So start low and watch velocity to know where you are regarding Pressure, not "signs".</p><p>Temp stability with extruded powders is only such under design conditions. Dr. Denton Bramwell has done some very nice tests around this. As an example: Varget provides fine accuracy in the 223 with 55gr bullets. But is far more sensitive than H335. Considering Varget was designed around ball ammo in the 308, this isn't surprising. But the point is don't let " Extreme "claims alone sway you.</p><p></p><p>In the Creedmoor, we've Pressure Traced all of the powders mentioned when I was south in AZ in the winter. Superformance is stable. The catch with it, centers around what you want to accomplish.</p><p>4350 has a classic peaky burning curve. RL-17 is more progressive. Super is VERY progressive, but the curve shifts with Pressure. As you increase operating Pressure, the curve begins to peak like normal. The canister version of Superformance was designed around the 30-06, so again no real surprise it works well in the Creed.</p><p>I personally like it in the Creed, as I can take advantage of the curve, and give up a mere 50 fps, when only running 50,000 psi.</p><p>This gives me fine accuracy, and allows me to stretch my lots of powder.</p><p>Here are some examples of the burning curves, pressures, speed; all tested and fired from the same Ruger Predator.</p><p><img src="http://i78.photobucket.com/albums/j84/Darkker13/Mobile%20Uploads/Screenshot_2015-11-26-20-21-35_zps0ktikfds.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i78.photobucket.com/albums/j84/Darkker13/Mobile%20Uploads/Screenshot_2014-12-26-20-33-14_zpskz7cqnti.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i78.photobucket.com/albums/j84/Darkker13/Mobile%20Uploads/Screenshot_2014-12-26-14-36-09_zpsv6lwcels.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="http://i78.photobucket.com/albums/j84/Darkker13/Mobile%20Uploads/Screenshot_2014-12-26-14-35-27_zpsvfj221vz.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Darkker, post: 1170649, member: 81406"] ,So remember that lot variation CAN be very large, there is a real reason why the "drop 10%" warning when switching lots is there. My first 8# of Superformance was slower than book data, my second was a wee faster, and this third is well slower. So start low and watch velocity to know where you are regarding Pressure, not "signs". Temp stability with extruded powders is only such under design conditions. Dr. Denton Bramwell has done some very nice tests around this. As an example: Varget provides fine accuracy in the 223 with 55gr bullets. But is far more sensitive than H335. Considering Varget was designed around ball ammo in the 308, this isn't surprising. But the point is don't let " Extreme "claims alone sway you. In the Creedmoor, we've Pressure Traced all of the powders mentioned when I was south in AZ in the winter. Superformance is stable. The catch with it, centers around what you want to accomplish. 4350 has a classic peaky burning curve. RL-17 is more progressive. Super is VERY progressive, but the curve shifts with Pressure. As you increase operating Pressure, the curve begins to peak like normal. The canister version of Superformance was designed around the 30-06, so again no real surprise it works well in the Creed. I personally like it in the Creed, as I can take advantage of the curve, and give up a mere 50 fps, when only running 50,000 psi. This gives me fine accuracy, and allows me to stretch my lots of powder. Here are some examples of the burning curves, pressures, speed; all tested and fired from the same Ruger Predator. [IMG]http://i78.photobucket.com/albums/j84/Darkker13/Mobile%20Uploads/Screenshot_2015-11-26-20-21-35_zps0ktikfds.png[/IMG] [IMG]http://i78.photobucket.com/albums/j84/Darkker13/Mobile%20Uploads/Screenshot_2014-12-26-20-33-14_zpskz7cqnti.png[/IMG] [IMG]http://i78.photobucket.com/albums/j84/Darkker13/Mobile%20Uploads/Screenshot_2014-12-26-14-36-09_zpsv6lwcels.png[/IMG] [IMG]http://i78.photobucket.com/albums/j84/Darkker13/Mobile%20Uploads/Screenshot_2014-12-26-14-35-27_zpsvfj221vz.png[/IMG] [/QUOTE]
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Tough Choice On Powder Selection 6.5 Crreedmoor
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