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Long Range Hunting & Shooting
Extreme spread and standard deviation vs accuracy
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<blockquote data-quote="Hugnot" data-source="post: 2925936" data-attributes="member: 115658"><p>This is of some interest to me as a will be shooting a 6.5PRC soon. I expect better velocities than the 6.5-06 using 140 grain bullets. There must be a good reason to spend more money and time looking for brass. I also have a good supply of CCI 34 primers that provide good results with ball powders. Extruded powders are not made in the USA and periodic shortages of extruded powders occur.</p><p></p><p>Playing with the data:</p><p></p><p>This is the data for my 6.5-06 loads using Staball HD. I can buy SBHD at 2 LGS for about $40 / pound. Accuracy is real good, like 4 in same hole & 1 about 3/8 out. Extreme spread needs more work. My LGS has lots of CCI 34's selling for about $85 / 1,000. Periodic shoots have produced equal accuracy. I plan shooting at 1,000 and at long range rodents next spring with the 6,5 PRC. Running the Hornady 4DOF number stuff shows the 6.5 140 ELDM outperforming other lighter 6.5 ELDM bullets at ranges greater than 400-500 yards.</p><p></p><p>[ATTACH]502515[/ATTACH]</p><p></p><p>OP's data.</p><p>This shows promise. Toss out the last value of 2905 and that difference of 14 fps between average hi-low would be less. I combined data for both groups as the same 52.7 grain powder charge was used for both. Velocities are similar to cheap to shoot 6.5-06.</p><p></p><p>[ATTACH]502516[/ATTACH]</p><p></p><p>OP's Data</p><p></p><p>This is data from the 51.6 grain IMR 4831 load with 143 HELDX bullets. Appears to group good but not enough data to provide consistency as shown by hi Tval & big diffs between hi-low averages. This is because only 4 samples were used.</p><p></p><p>[ATTACH]502517[/ATTACH]</p><p></p><p>My humble suggestion would be to migrate to another powder like VN 165, H1000, Staball HD- whatever can be had. Double base powders would provide higher velocities per weight.</p><p></p><p>My plans for my new 6.5 PRC are to buy whatever is the cheapest & most available to provide optimum velocities, accuracy & narrow average velocity differences. The goal being production of a batch of 200-300 rounds with minimum extreme spreads and acceptable accuracy. If velocities are not greater than 100 fps with more accuracy and consistency than the 6.5-06 there would not be any logical reason to spend more money on 6.5 PRC brass & a new rifle build. I plan to start my 6.5 PRC ammo production with SBHD, 140 ELDM bullets, CCI 34 primers & Hornady 6.5 PRC brass. My LGS has all of this.</p><p></p><p>I like the way SBHD goes thru my powder measure.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2925936, member: 115658"] This is of some interest to me as a will be shooting a 6.5PRC soon. I expect better velocities than the 6.5-06 using 140 grain bullets. There must be a good reason to spend more money and time looking for brass. I also have a good supply of CCI 34 primers that provide good results with ball powders. Extruded powders are not made in the USA and periodic shortages of extruded powders occur. Playing with the data: This is the data for my 6.5-06 loads using Staball HD. I can buy SBHD at 2 LGS for about $40 / pound. Accuracy is real good, like 4 in same hole & 1 about 3/8 out. Extreme spread needs more work. My LGS has lots of CCI 34's selling for about $85 / 1,000. Periodic shoots have produced equal accuracy. I plan shooting at 1,000 and at long range rodents next spring with the 6,5 PRC. Running the Hornady 4DOF number stuff shows the 6.5 140 ELDM outperforming other lighter 6.5 ELDM bullets at ranges greater than 400-500 yards. [ATTACH alt="Screenshot (748).png"]502515[/ATTACH] OP's data. This shows promise. Toss out the last value of 2905 and that difference of 14 fps between average hi-low would be less. I combined data for both groups as the same 52.7 grain powder charge was used for both. Velocities are similar to cheap to shoot 6.5-06. [ATTACH alt="Screenshot (749).png"]502516[/ATTACH] OP's Data This is data from the 51.6 grain IMR 4831 load with 143 HELDX bullets. Appears to group good but not enough data to provide consistency as shown by hi Tval & big diffs between hi-low averages. This is because only 4 samples were used. [ATTACH alt="Screenshot (750).png"]502517[/ATTACH] My humble suggestion would be to migrate to another powder like VN 165, H1000, Staball HD- whatever can be had. Double base powders would provide higher velocities per weight. My plans for my new 6.5 PRC are to buy whatever is the cheapest & most available to provide optimum velocities, accuracy & narrow average velocity differences. The goal being production of a batch of 200-300 rounds with minimum extreme spreads and acceptable accuracy. If velocities are not greater than 100 fps with more accuracy and consistency than the 6.5-06 there would not be any logical reason to spend more money on 6.5 PRC brass & a new rifle build. I plan to start my 6.5 PRC ammo production with SBHD, 140 ELDM bullets, CCI 34 primers & Hornady 6.5 PRC brass. My LGS has all of this. I like the way SBHD goes thru my powder measure. [/QUOTE]
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