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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Introducing the Absolute Hammer
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<blockquote data-quote="speedengineer" data-source="post: 1986560" data-attributes="member: 112986"><p>I tried to simulate these new bullets in QuickLoad to see what it suggests. (Full disclosure, I am not a QL expert by any means, and it's totally possible I am missing something). I assumed that the increase in speed would be due to reduced engraving pressure of the bullet entering the rifling. QL suggests ~6500psi for a standard copper solid. So, I compared a simulation with 6500psi for the baseline, and a wild guess of 1000psi for the Absolute Hunter. No idea on the validity of that number, but I wanted to see what effect this magnitude of a change has on predicted muzzle velocity. Simulation is for a 6.5 PRC, limiting to 60k psi as that is more representative of bullet velocities I observe in real life.</p><p></p><p>Simulating "traditional HH" style bullet with 6500psi engraving pressure:</p><p>[CODE]119 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped.</p><p>Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time</p><p> % Grains Gramm fps % psi psi ms</p><p>--------------------------------- -----------------------------------------------------------------</p><p>Alliant Reloder-26 *C 92.7 61.3 3.97 3276 100.0 60000 12101 1.230 ! Near Maximum !</p><p>Alliant Reloder-25 *C 101.5 62.1 4.02 3266 100.0 60000 11829 1.213 ! Near Maximum !</p><p>PB Clermont PCL 517 98.8 64.8 4.20 3265 99.5 60000 12520 1.212 ! Near Maximum !</p><p>SNPE Vectan SP 12 98.6 64.7 4.19 3264 99.5 60000 12494 1.212 ! Near Maximum !</p><p>ReloadSwiss RS 70 *C 91.4 59.8 3.88 3259 100.0 60000 11952 1.205 ! Near Maximum !</p><p>Norma MRP *C 93.8 60.2 3.90 3258 100.0 60000 12304 1.224 ! Near Maximum ![/CODE]</p><p></p><p>Simulating "Absolute Hunter" style bullet using 1000psi engraving pressure:</p><p>[CODE]97 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped.</p><p>Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time</p><p> % Grains Gramm fps % psi psi ms</p><p>--------------------------------- -----------------------------------------------------------------</p><p>Alliant Reloder-26 *C 97.9 64.7 4.20 3333 100.0 60000 12781 1.215 ! Near Maximum !</p><p>Vihtavuori N560 *C 100.5 63.2 4.09 3323 99.0 60000 13352 1.200 ! Near Maximum !</p><p>Norma MRP *C 98.8 63.4 4.11 3320 100.0 60000 12924 1.207 ! Near Maximum !</p><p>Accurate MAGPRO 100.9 65.9 4.27 3314 98.1 60000 13462 1.208 ! Near Maximum !</p><p>IMR 7828 SSC 99.3 62.7 4.07 3312 99.3 60000 12928 1.190 ! Near Maximum !</p><p>ReloadSwiss RS 70 *C 95.8 62.8 4.07 3312 100.0 60000 12513 1.192 ! Near Maximum !</p><p>ADI AR 2213 100.3 62.3 4.04 3298 99.3 60000 12810 1.187 ! Near Maximum ![/CODE]</p><p></p><p></p><p>I'm seeing 50, maybe 60 fps advantage for the AH after optimizing for powder charge to the same peak pressure. Are there other reasons besides engraving pressure that would cause this bullet to achieve higher velocities? I don't see any setting for the amount of friction of the bullet after it's moving down the barrel. Would this even be a contributing factor, and if so, do any QL experts know if this setting is user adjustable? It doesn't appear to be. Any other thoughts?</p></blockquote><p></p>
[QUOTE="speedengineer, post: 1986560, member: 112986"] I tried to simulate these new bullets in QuickLoad to see what it suggests. (Full disclosure, I am not a QL expert by any means, and it's totally possible I am missing something). I assumed that the increase in speed would be due to reduced engraving pressure of the bullet entering the rifling. QL suggests ~6500psi for a standard copper solid. So, I compared a simulation with 6500psi for the baseline, and a wild guess of 1000psi for the Absolute Hunter. No idea on the validity of that number, but I wanted to see what effect this magnitude of a change has on predicted muzzle velocity. Simulation is for a 6.5 PRC, limiting to 60k psi as that is more representative of bullet velocities I observe in real life. Simulating "traditional HH" style bullet with 6500psi engraving pressure: [CODE]119 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped. Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time % Grains Gramm fps % psi psi ms --------------------------------- ----------------------------------------------------------------- Alliant Reloder-26 *C 92.7 61.3 3.97 3276 100.0 60000 12101 1.230 ! Near Maximum ! Alliant Reloder-25 *C 101.5 62.1 4.02 3266 100.0 60000 11829 1.213 ! Near Maximum ! PB Clermont PCL 517 98.8 64.8 4.20 3265 99.5 60000 12520 1.212 ! Near Maximum ! SNPE Vectan SP 12 98.6 64.7 4.19 3264 99.5 60000 12494 1.212 ! Near Maximum ! ReloadSwiss RS 70 *C 91.4 59.8 3.88 3259 100.0 60000 11952 1.205 ! Near Maximum ! Norma MRP *C 93.8 60.2 3.90 3258 100.0 60000 12304 1.224 ! Near Maximum ![/CODE] Simulating "Absolute Hunter" style bullet using 1000psi engraving pressure: [CODE]97 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped. Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time % Grains Gramm fps % psi psi ms --------------------------------- ----------------------------------------------------------------- Alliant Reloder-26 *C 97.9 64.7 4.20 3333 100.0 60000 12781 1.215 ! Near Maximum ! Vihtavuori N560 *C 100.5 63.2 4.09 3323 99.0 60000 13352 1.200 ! Near Maximum ! Norma MRP *C 98.8 63.4 4.11 3320 100.0 60000 12924 1.207 ! Near Maximum ! Accurate MAGPRO 100.9 65.9 4.27 3314 98.1 60000 13462 1.208 ! Near Maximum ! IMR 7828 SSC 99.3 62.7 4.07 3312 99.3 60000 12928 1.190 ! Near Maximum ! ReloadSwiss RS 70 *C 95.8 62.8 4.07 3312 100.0 60000 12513 1.192 ! Near Maximum ! ADI AR 2213 100.3 62.3 4.04 3298 99.3 60000 12810 1.187 ! Near Maximum ![/CODE] I'm seeing 50, maybe 60 fps advantage for the AH after optimizing for powder charge to the same peak pressure. Are there other reasons besides engraving pressure that would cause this bullet to achieve higher velocities? I don't see any setting for the amount of friction of the bullet after it's moving down the barrel. Would this even be a contributing factor, and if so, do any QL experts know if this setting is user adjustable? It doesn't appear to be. Any other thoughts? [/QUOTE]
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Introducing the Absolute Hammer
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