Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 100gr | Norma ORYX bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and ReloadSwiss RS 70.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 98% | 48,979 psi | 89% | 2920 fps | 98.8% |
| Accurate 4350 | <<locked>> | 88% | 47,659 psi | 86% | 2920 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 82% | 48,124 psi | 87% | 2861 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 94% | 48,979 psi | 89% | 2959 fps | 96.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 49,240 psi | 89% | 2959 fps | 96.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 49,240 psi | 89% | 2959 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 48,646 psi | 88% | 2884 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 48,979 psi | 89% | 2989 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 86% | 49,559 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 48,602 psi | 88% | 2949 fps | 96.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 48,791 psi | 88% | 2999 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,487 psi | 90% | 3002 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,018 psi | 78% | 2910 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 49,052 psi | 89% | 3074 fps | 99.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,080 psi | 87% | 2982 fps | 96.3% |
| Bofors RP3 | <<locked>> | 82% | 48,878 psi | 88% | 2894 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 48,791 psi | 88% | 2999 fps | 96.7% |
| Bofors RP7 | <<locked>> | 86% | 49,023 psi | 89% | 2877 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 82% | 49,588 psi | 90% | 2910 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 88% | 49,937 psi | 90% | 2972 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 86% | 49,922 psi | 90% | 2930 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 49,008 psi | 89% | 2913 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 49,559 psi | 90% | 2999 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,201 psi | 66% | 1877 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 49,850 psi | 90% | 2910 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 47,471 psi | 86% | 2851 fps | 97.6% |
| IMR 4831 | <<locked>> | 90% | 48,515 psi | 88% | 2920 fps | 99.7% |
| Lovex S065 | <<locked>> | 86% | 47,413 psi | 86% | 2848 fps | 98.7% |
| Lovex S070 | <<locked>> | 88% | 48,501 psi | 88% | 2890 fps | 98.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,598 psi | 79% | 2822 fps | 97.8% |
| Norma MRP | <<locked>> | 96% | 48,457 psi | 88% | 3028 fps | 98% |
| Norma URP | <<locked>> | 88% | 47,065 psi | 85% | 2910 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 90% | 49,139 psi | 89% | 2963 fps | 98.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,745 psi | 83% | 2917 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,825 psi | 67% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 49,559 psi | 90% | 2894 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 49,066 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 47,558 psi | 86% | 2940 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 49,501 psi | 90% | 3022 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 49,124 psi | 89% | 2894 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 47,442 psi | 86% | 2930 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 86% | 49,023 psi | 89% | 2877 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 47,413 psi | 86% | 2848 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 88% | 48,501 psi | 88% | 2890 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 47,384 psi | 86% | 2897 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 47,384 psi | 86% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 49,893 psi | 90% | 2848 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,007 psi | 85% | 2923 fps | 96.2% |
| Somchem S355 | <<locked>> | 84% | 49,400 psi | 89% | 2894 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 49,240 psi | 89% | 2972 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 48,109 psi | 87% | 2907 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 84% | 47,239 psi | 85% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 48,776 psi | 88% | 2904 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 98% | 47,369 psi | 86% | 2881 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 88% | 48,037 psi | 87% | 2907 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 96% | 48,428 psi | 88% | 2972 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 48,356 psi | 88% | 2874 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 46,920 psi | 85% | 2917 fps | 97.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,585 psi | 81% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,892 psi | 87% | 2897 fps | 96.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 34,795 psi | 63% | 2628 fps | 95.1% |
| Accurate 4350 | <<locked>> | 80% | 36,274 psi | 66% | 2684 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 80% | 45,237 psi | 82% | 2805 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 45,963 psi | 83% | 2897 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,948 psi | 83% | 2897 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,948 psi | 83% | 2897 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,701 psi | 83% | 2831 fps | 100% |
| Alliant Reloder-16 | 36.6 gr | 80% | 35,476 psi | 64% | 2694 fps | 97.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,045 psi | 72% | 2822 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,397 psi | 82% | 2887 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,774 psi | 83% | 2940 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,702 psi | 50% | 2490 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,534 psi | 64% | 2726 fps | 95.9% |
| Alliant Reloder-26 | 42.4 gr | 84% | 31,691 psi | 57% | 2664 fps | 95% |
| Bofors RP15 | <<locked>> | 98% | 44,802 psi | 81% | 2917 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 45,890 psi | 83% | 2841 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 45,774 psi | 83% | 2940 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 40,495 psi | 73% | 2703 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,296 psi | 84% | 2851 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 38,348 psi | 69% | 2733 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 82% | 43,888 psi | 79% | 2812 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,098 psi | 60% | 2589 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 82% | 39,972 psi | 72% | 2799 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,195 psi | 49% | 1680 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 41,263 psi | 75% | 2740 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,756 psi | 76% | 2733 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 34,795 psi | 63% | 2631 fps | 97% |
| Lovex S065 | <<locked>> | 80% | 39,494 psi | 71% | 2687 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 37,695 psi | 68% | 2661 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 36,071 psi | 65% | 2657 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 39,218 psi | 71% | 2828 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 36,187 psi | 65% | 2680 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 82% | 37,550 psi | 68% | 2720 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 98% | 42,496 psi | 77% | 2848 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,543 psi | 50% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,354 psi | 84% | 2831 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,569 psi | 77% | 2884 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,013 psi | 65% | 2697 fps | 97% |
| ReloadSwiss RS 70 | 40 gr | 80% | 35,041 psi | 63% | 2697 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 43,265 psi | 78% | 2785 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 92% | 44,498 psi | 81% | 2871 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 40,495 psi | 73% | 2703 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,494 psi | 71% | 2687 fps | 97% |
| Shooters World SW4350 | <<locked>> | 80% | 37,695 psi | 68% | 2661 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,222 psi | 80% | 2838 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,469 psi | 80% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,667 psi | 70% | 2628 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,077 psi | 80% | 2864 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 43,656 psi | 79% | 2785 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 32,619 psi | 59% | 2635 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 42,206 psi | 76% | 2792 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 41,626 psi | 75% | 2713 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,565 psi | 68% | 2680 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 94% | 41,742 psi | 76% | 2769 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 37,014 psi | 67% | 2680 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 30,487 psi | 55% | 2572 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,666 psi | 66% | 2644 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 38,348 psi | 69% | 2733 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,194 psi | 47% | 2513 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,875 psi | 81% | 2838 fps | 95.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 60 powders for .243 Ackley Improved loaded with the .243 | 100gr | Norma ORYX. Alliant Reloder-26 delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,074 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 60 of the 60 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 66–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Reloder-26, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .243 Ackley Improved with the .243 | 100gr | Norma ORYX they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.