Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 90gr | Hornady ELD-X bullet and 62 powders. The key underlying parameters are shown in the table above.
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 2495 | <<locked>> | 82% | 49,908 psi | 90% | 2972 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,211 psi | 87% | 2953 fps | 95.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,182 psi | 87% | 3038 fps | 97.7% |
| Accurate 4064 | <<locked>> | 82% | 47,137 psi | 85% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 46,789 psi | 85% | 3041 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 84% | 47,834 psi | 87% | 2992 fps | 99.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 49,429 psi | 89% | 3163 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 48,370 psi | 88% | 3025 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 82% | 48,573 psi | 88% | 3038 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 92% | 48,399 psi | 88% | 3114 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 88% | 48,747 psi | 88% | 3140 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,049 psi | 82% | 3058 fps | 99.7% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,624 psi | 72% | 2949 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 98% | 47,935 psi | 87% | 3189 fps | 99.1% |
| Bofors RP3 | <<locked>> | 84% | 48,428 psi | 88% | 3031 fps | 99.9% |
| Bofors RP7 | <<locked>> | 88% | 48,588 psi | 88% | 2999 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 84% | 49,298 psi | 89% | 3045 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 90% | 49,559 psi | 90% | 3100 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 48,225 psi | 87% | 3041 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 90% | 49,429 psi | 89% | 3123 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 65% | 1969 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 47,282 psi | 86% | 2976 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 82% | 49,792 psi | 90% | 2999 fps | 97.1% |
| IMR 4350 | <<locked>> | 92% | 49,414 psi | 89% | 3035 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 47,442 psi | 86% | 2979 fps | 96.5% |
| IMR 4831 | <<locked>> | 92% | 47,732 psi | 86% | 3045 fps | 99% |
| IMR 4895 | <<locked>> | 82% | 49,850 psi | 90% | 3071 fps | 99.8% |
| Lovex S062 | <<locked>> | 82% | 47,485 psi | 86% | 2976 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 47,166 psi | 85% | 2976 fps | 97.8% |
| Lovex S070 | <<locked>> | 90% | 48,080 psi | 87% | 3015 fps | 97% |
| Norma 203B | <<locked>> | 82% | 47,906 psi | 87% | 3025 fps | 99.6% |
| Norma MRP | <<locked>> | 98% | 47,311 psi | 86% | 3136 fps | 96.5% |
| Norma URP | <<locked>> | 92% | 49,443 psi | 89% | 3094 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 82% | 48,022 psi | 87% | 3045 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 92% | 48,269 psi | 87% | 3084 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,390 psi | 66% | 2014 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 49,342 psi | 89% | 3022 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 48,298 psi | 87% | 3136 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 46,804 psi | 85% | 3064 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 49,037 psi | 89% | 3146 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 82% | 49,472 psi | 90% | 2995 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 48,660 psi | 88% | 3028 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 88% | 48,588 psi | 88% | 2999 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 47,166 psi | 85% | 2976 fps | 97.8% |
| Shooters World Precision | <<locked>> | 82% | 47,485 psi | 86% | 2976 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 48,080 psi | 87% | 3015 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 46,891 psi | 85% | 3028 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 47,514 psi | 86% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 49,734 psi | 90% | 2976 fps | 97.1% |
| Somchem S355 | <<locked>> | 86% | 49,095 psi | 89% | 3028 fps | 99.9% |
| Somchem S365 | <<locked>> | 94% | 48,051 psi | 87% | 3100 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 47,601 psi | 86% | 3028 fps | 96% |
| Vihtavuori N135 | <<locked>> | 82% | 49,501 psi | 90% | 2966 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 49,661 psi | 90% | 2972 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 50,009 psi | 90% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 48,196 psi | 87% | 3031 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 48,153 psi | 87% | 2966 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 47,674 psi | 86% | 3038 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 98% | 47,166 psi | 85% | 3087 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 48,066 psi | 87% | 3005 fps | 99.9% |
| Winchester 760 | <<locked>> | 90% | 49,559 psi | 90% | 3100 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,712 psi | 74% | 3091 fps | 99.9% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 46,833 psi | 85% | 2920 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,411 psi | 82% | 2897 fps | 95.1% |
| Accurate 3100 | <<locked>> | 94% | 38,943 psi | 70% | 2848 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 44,324 psi | 80% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 35,607 psi | 64% | 2795 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 42,293 psi | 77% | 2877 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,079 psi | 83% | 3094 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,409 psi | 77% | 2907 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,368 psi | 82% | 2976 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 35,186 psi | 64% | 2805 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,072 psi | 67% | 2881 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,821 psi | 56% | 2700 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,333 psi | 68% | 2887 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,795 psi | 65% | 2897 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 42,366 psi | 77% | 2910 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 45,701 psi | 83% | 2940 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 42,917 psi | 78% | 2913 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 43,134 psi | 78% | 2969 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,400 psi | 55% | 2631 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 88% | 45,803 psi | 83% | 3051 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 48% | 1762 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,454 psi | 80% | 2917 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,920 psi | 85% | 2943 fps | 96.4% |
| IMR 4350 | <<locked>> | 90% | 46,238 psi | 84% | 2972 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,338 psi | 80% | 2917 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 34,258 psi | 62% | 2743 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 46,528 psi | 84% | 3009 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 44,599 psi | 81% | 2920 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 39,059 psi | 71% | 2802 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 42,293 psi | 77% | 2890 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 44,744 psi | 81% | 2963 fps | 99.3% |
| Norma MRP | <<locked>> | 96% | 44,396 psi | 80% | 3074 fps | 95.7% |
| Norma URP | <<locked>> | 82% | 35,418 psi | 64% | 2785 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 44,860 psi | 81% | 2982 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 39,566 psi | 72% | 2897 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,238 psi | 49% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,163 psi | 78% | 2894 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,436 psi | 71% | 2953 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,201 psi | 64% | 2805 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 37,260 psi | 67% | 2874 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 46,557 psi | 84% | 2940 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,914 psi | 72% | 2851 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 45,701 psi | 83% | 2940 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 39,059 psi | 71% | 2802 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 44,599 psi | 81% | 2920 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 42,293 psi | 77% | 2890 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,118 psi | 74% | 2907 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,901 psi | 76% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,685 psi | 79% | 2858 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 40,509 psi | 73% | 2858 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 29,805 psi | 54% | 2674 fps | 97.1% |
| Somchem S385 | <<locked>> | 94% | 44,382 psi | 80% | 2963 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 46,412 psi | 84% | 2913 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,659 psi | 84% | 2920 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,609 psi | 70% | 2785 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 34,548 psi | 63% | 2730 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 44,976 psi | 81% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,506 psi | 66% | 2792 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 86% | 31,618 psi | 57% | 2726 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,185 psi | 62% | 2703 fps | 97.7% |
| Winchester 760 | <<locked>> | 86% | 43,482 psi | 79% | 2976 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,109 psi | 53% | 2723 fps | 95.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 62 powders for .243 Ackley Improved loaded with the .243 | 90gr | Hornady ELD-X. Alliant Reloder-26 delivers the highest muzzle velocity at 3,189 fps; across all powders the maximum-charge window runs from 1,969 fps to 3,189 fps. Accurate 3100 gives the best case fill at 100 %, and 62 of the 62 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 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.