Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 100gr | Nosler Solid Base bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Bofors RP5.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 48,225 psi | 87% | 2917 fps | 98.8% |
| Accurate 4350 | <<locked>> | 86% | 46,978 psi | 85% | 2917 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 82% | 49,734 psi | 90% | 2900 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 92% | 47,790 psi | 86% | 2946 fps | 96.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 48,138 psi | 87% | 2949 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 47,848 psi | 87% | 2976 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 84% | 48,472 psi | 88% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 47,572 psi | 86% | 2940 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 48,298 psi | 87% | 3002 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 48,776 psi | 88% | 2999 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,136 psi | 82% | 2969 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 48,182 psi | 87% | 3064 fps | 99.8% |
| Bofors RP15 | <<locked>> | 98% | 47,239 psi | 85% | 2979 fps | 96.4% |
| Bofors RP5 | <<locked>> | 96% | 48,298 psi | 87% | 3002 fps | 96.8% |
| Bofors RP7 | <<locked>> | 84% | 47,587 psi | 86% | 2864 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 49,066 psi | 89% | 2966 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 84% | 48,747 psi | 88% | 2920 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 48,182 psi | 87% | 2907 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,382 psi | 80% | 3002 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 86% | 48,399 psi | 88% | 2986 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,521 psi | 66% | 1900 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 48,573 psi | 88% | 2900 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 49,211 psi | 89% | 2897 fps | 98.1% |
| IMR 4831 | <<locked>> | 88% | 47,761 psi | 86% | 2913 fps | 99.7% |
| Lovex S065 | <<locked>> | 86% | 49,197 psi | 89% | 2894 fps | 99.1% |
| Lovex S070 | <<locked>> | 86% | 47,384 psi | 86% | 2877 fps | 98.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,861 psi | 83% | 2871 fps | 98.4% |
| Norma 204 | <<locked>> | 88% | 48,631 psi | 88% | 2940 fps | 96.5% |
| Norma MRP | <<locked>> | 94% | 47,630 psi | 86% | 3022 fps | 98% |
| Norma URP | <<locked>> | 88% | 49,327 psi | 89% | 2959 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 88% | 47,892 psi | 87% | 2949 fps | 98.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,167 psi | 87% | 2976 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 67% | 1942 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 48,066 psi | 87% | 2992 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 46,775 psi | 85% | 2933 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 48,370 psi | 88% | 3009 fps | 99.6% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,266 psi | 80% | 2992 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 48,196 psi | 87% | 2887 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 49,835 psi | 90% | 2986 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 84% | 47,587 psi | 86% | 2864 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 49,197 psi | 89% | 2894 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 86% | 47,384 psi | 86% | 2877 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 49,327 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 49,066 psi | 89% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 48,588 psi | 88% | 2838 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 49,385 psi | 89% | 2979 fps | 97% |
| Somchem S355 | <<locked>> | 82% | 48,167 psi | 87% | 2881 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 48,559 psi | 88% | 2966 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 47,442 psi | 86% | 2907 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 84% | 49,110 psi | 89% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 47,979 psi | 87% | 2900 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 98% | 49,792 psi | 90% | 2933 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 86% | 47,224 psi | 85% | 2900 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 94% | 47,979 psi | 87% | 2969 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 47,253 psi | 86% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 49,066 psi | 89% | 2966 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,224 psi | 85% | 3114 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 46,949 psi | 85% | 2890 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>> | 86% | 34,461 psi | 62% | 2625 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 37,985 psi | 69% | 2730 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 46,891 psi | 85% | 2848 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 45,005 psi | 81% | 2890 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 45,049 psi | 82% | 2887 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,970 psi | 67% | 2740 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,901 psi | 76% | 2871 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,527 psi | 81% | 2877 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,163 psi | 76% | 2871 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,224 psi | 49% | 2477 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,911 psi | 63% | 2720 fps | 95.9% |
| Alliant Reloder-26 | 43.1 gr | 82% | 31,140 psi | 56% | 2654 fps | 95% |
| Bofors RP15 | <<locked>> | 96% | 44,179 psi | 80% | 2913 fps | 95.5% |
| Bofors RP5 | 45.5 gr | 92% | 42,163 psi | 76% | 2871 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 42,003 psi | 76% | 2749 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 39,856 psi | 72% | 2776 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 42,757 psi | 77% | 2799 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,432 psi | 62% | 2628 fps | 98.6% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,539 psi | 75% | 2930 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 39,015 psi | 71% | 2785 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,282 psi | 49% | 1696 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 40,190 psi | 73% | 2730 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,511 psi | 79% | 2782 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 36,651 psi | 66% | 2684 fps | 97.8% |
| Lovex S065 | <<locked>> | 80% | 41,002 psi | 74% | 2730 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 39,189 psi | 71% | 2707 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 35,433 psi | 64% | 2651 fps | 95.6% |
| Norma 204 | <<locked>> | 86% | 45,484 psi | 82% | 2877 fps | 95.6% |
| Norma MRP | 44.9 gr | 88% | 38,551 psi | 70% | 2818 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 37,811 psi | 68% | 2726 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 80% | 36,651 psi | 66% | 2707 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 41,756 psi | 76% | 2844 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 50% | 1736 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,512 psi | 81% | 2930 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,840 psi | 68% | 2746 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,753 psi | 67% | 2753 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,464 psi | 70% | 2844 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 45,034 psi | 81% | 2828 fps | 100% |
| Rottweil R 905 | <<locked>> | 90% | 43,743 psi | 79% | 2864 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,003 psi | 76% | 2749 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,002 psi | 74% | 2730 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 80% | 39,189 psi | 71% | 2707 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,166 psi | 84% | 2884 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,180 psi | 84% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,045 psi | 72% | 2667 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,337 psi | 78% | 2858 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 45,368 psi | 82% | 2828 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 34,243 psi | 62% | 2677 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 41,524 psi | 75% | 2785 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 43,236 psi | 78% | 2753 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,131 psi | 71% | 2723 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 40,886 psi | 74% | 2762 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 38,754 psi | 70% | 2726 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 30,066 psi | 54% | 2559 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,348 psi | 69% | 2694 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 40,132 psi | 73% | 2782 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,628 psi | 46% | 2500 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,787 psi | 79% | 2828 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 58 powders for .243 Ackley Improved loaded with the .243 | 100gr | Nosler Solid Base. Winchester StaBALL HD delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,900 fps to 3,114 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 58 of the 58 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 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Hodgdon Retumbo, Hodgdon TrailBoss 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. Norma MRP, Alliant Reloder-26, Bofors RP5 rank at the top here: for .243 Ackley Improved with the .243 | 100gr | Nosler Solid Base 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.