Load Specifications
Load data in caliber .243 Ackley Improved with .2425 | 90gr | Prvi Partizan SP bullet and 54 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Norma MRP.
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% | 47,427 psi | 86% | 3031 fps | 97.8% |
| Accurate 4064 | <<locked>> | 82% | 49,530 psi | 90% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 49,603 psi | 90% | 3100 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 84% | 49,821 psi | 90% | 3041 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 47,268 psi | 86% | 3012 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 47,311 psi | 86% | 3104 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 47,935 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,601 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,640 psi | 75% | 3012 fps | 97.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 47,355 psi | 86% | 3182 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 47,630 psi | 86% | 3025 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 47,529 psi | 86% | 2989 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 82% | 48,008 psi | 87% | 3028 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 88% | 48,428 psi | 88% | 3087 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 86% | 48,762 psi | 88% | 3054 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 47,471 psi | 86% | 3035 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 48,153 psi | 87% | 3110 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 65% | 1991 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 49,429 psi | 89% | 3025 fps | 99.7% |
| IMR 4350 | <<locked>> | 90% | 48,196 psi | 87% | 3022 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 49,168 psi | 89% | 3025 fps | 97.1% |
| IMR 4831 | <<locked>> | 90% | 47,036 psi | 85% | 3038 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 49,313 psi | 89% | 3018 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 49,298 psi | 89% | 3028 fps | 98.4% |
| Lovex S070 | <<locked>> | 88% | 47,021 psi | 85% | 3002 fps | 97% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,076 psi | 76% | 2923 fps | 96.5% |
| Norma 203B | <<locked>> | 82% | 49,734 psi | 90% | 3071 fps | 99.8% |
| Norma MRP | <<locked>> | 96% | 46,789 psi | 85% | 3133 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 48,689 psi | 88% | 3087 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 90% | 47,456 psi | 86% | 3074 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,608 psi | 66% | 2037 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 48,269 psi | 87% | 3012 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 47,645 psi | 86% | 3133 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 49,356 psi | 89% | 3120 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 48,240 psi | 87% | 3140 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 84% | 47,819 psi | 87% | 3022 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 47,529 psi | 86% | 2989 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 49,298 psi | 89% | 3028 fps | 98.4% |
| Shooters World Precision | <<locked>> | 82% | 49,313 psi | 89% | 3018 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 47,021 psi | 85% | 3002 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 49,197 psi | 89% | 3081 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 49,298 psi | 89% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 48,776 psi | 88% | 2969 fps | 97.2% |
| Somchem S355 | <<locked>> | 84% | 47,921 psi | 87% | 3018 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 47,413 psi | 86% | 3094 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 46,920 psi | 85% | 3025 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 86% | 49,226 psi | 89% | 2999 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 47,442 psi | 86% | 3025 fps | 99% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,168 psi | 89% | 3051 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 90% | 49,763 psi | 90% | 3084 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 96% | 46,760 psi | 85% | 3087 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 47,007 psi | 85% | 2995 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 48,718 psi | 88% | 3094 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,076 psi | 78% | 3159 fps | 100% |
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>> | 92% | 38,667 psi | 70% | 2848 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 46,369 psi | 84% | 2963 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,056 psi | 63% | 2782 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 44,019 psi | 80% | 2927 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,266 psi | 80% | 2953 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,301 psi | 62% | 2792 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,841 psi | 70% | 2936 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 30,414 psi | 55% | 2694 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,811 psi | 67% | 2884 fps | 95.2% |
| Alliant Reloder-26 | 46.7 gr | 88% | 35,433 psi | 64% | 2897 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 44,512 psi | 81% | 2963 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 44,802 psi | 81% | 2933 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 44,933 psi | 81% | 2969 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 42,380 psi | 77% | 2959 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 84% | 45,687 psi | 83% | 2989 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,937 psi | 58% | 2684 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 86% | 44,802 psi | 81% | 3041 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,948 psi | 49% | 1785 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,238 psi | 84% | 2966 fps | 99.3% |
| IMR 4350 | <<locked>> | 88% | 45,455 psi | 82% | 2966 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 43,555 psi | 79% | 2910 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 33,721 psi | 61% | 2733 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 46,485 psi | 84% | 2966 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,276 psi | 69% | 2792 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 41,553 psi | 75% | 2887 fps | 95.5% |
| Lovex S071 | <<locked>> | 98% | 39,508 psi | 71% | 2867 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 46,847 psi | 85% | 3015 fps | 99.6% |
| Norma MRP | 48.4 gr | 94% | 43,729 psi | 79% | 3064 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 34,853 psi | 63% | 2779 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 84% | 38,856 psi | 70% | 2887 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,514 psi | 50% | 1831 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,991 psi | 81% | 2946 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,307 psi | 75% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,577 psi | 63% | 2792 fps | 95.4% |
| ReloadSwiss RS 70 | 43.1 gr | 82% | 36,521 psi | 66% | 2864 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 41,771 psi | 76% | 2900 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 44,802 psi | 81% | 2933 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,276 psi | 69% | 2792 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 46,485 psi | 84% | 2966 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 41,553 psi | 75% | 2887 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,801 psi | 77% | 2953 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,410 psi | 79% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 42,728 psi | 77% | 2848 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 42,279 psi | 77% | 2904 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 31,328 psi | 57% | 2726 fps | 98% |
| Somchem S385 | <<locked>> | 92% | 43,903 psi | 79% | 2963 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 40,263 psi | 73% | 2828 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 36,390 psi | 66% | 2785 fps | 96.3% |
| Vihtavuori N165 | <<locked>> | 98% | 45,963 psi | 83% | 2989 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 35,824 psi | 65% | 2779 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 84% | 31,227 psi | 57% | 2717 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,810 psi | 65% | 2756 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 42,656 psi | 77% | 2966 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,761 psi | 52% | 2723 fps | 95.7% |
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 54 powders for .243 Ackley Improved loaded with the .2425 | 90gr | Prvi Partizan SP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,991 fps to 3,182 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 54 of the 54 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.2425" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, 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. Alliant Reloder-26, ReloadSwiss RS 70, Norma MRP rank at the top here: for .243 Ackley Improved with the .2425 | 90gr | Prvi Partizan SP 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.