Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 77gr | Hasler ARIETE bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 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 2495 | <<locked>> | 84% | 48,196 psi | 87% | 3166 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 48,298 psi | 87% | 3209 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 47,703 psi | 86% | 3264 fps | 97.8% |
| ADI AR 2206H | <<locked>> | 82% | 48,559 psi | 88% | 3232 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 88% | 49,603 psi | 90% | 3228 fps | 98.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 47,892 psi | 87% | 3337 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 49,719 psi | 90% | 3258 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 84% | 46,775 psi | 85% | 3209 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 96% | 49,385 psi | 89% | 3337 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 90% | 46,789 psi | 85% | 3304 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,350 psi | 73% | 3143 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,455 psi | 82% | 3323 fps | 97% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 48,167 psi | 87% | 3232 fps | 98% |
| Bofors RP3 | <<locked>> | 88% | 49,951 psi | 90% | 3268 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 86% | 47,616 psi | 86% | 3212 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 82% | 49,037 psi | 89% | 3245 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 48,907 psi | 89% | 3261 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 48,138 psi | 87% | 3268 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,433 psi | 64% | 2123 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 47,094 psi | 85% | 3189 fps | 99% |
| IMR 3031 | <<locked>> | 82% | 48,863 psi | 88% | 3245 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 49,110 psi | 89% | 3215 fps | 98.6% |
| IMR 4831 | <<locked>> | 96% | 48,689 psi | 88% | 3264 fps | 98.1% |
| IMR 4895 | <<locked>> | 84% | 47,950 psi | 87% | 3248 fps | 98.8% |
| Lovex D073.6 | <<locked>> | 82% | 48,051 psi | 87% | 3209 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 48,167 psi | 87% | 3156 fps | 98.8% |
| Lovex S062 | <<locked>> | 86% | 49,037 psi | 89% | 3215 fps | 99.6% |
| Lovex S065 | <<locked>> | 92% | 48,457 psi | 88% | 3199 fps | 96.6% |
| Norma 201 | <<locked>> | 82% | 47,326 psi | 86% | 3173 fps | 99.4% |
| Norma 202 | <<locked>> | 82% | 47,718 psi | 86% | 3186 fps | 100% |
| Norma 203B | <<locked>> | 86% | 49,327 psi | 89% | 3261 fps | 99% |
| Norma URP | <<locked>> | 94% | 47,471 psi | 86% | 3261 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 86% | 49,661 psi | 90% | 3284 fps | 99% |
| Ramshot Hunter | <<locked>> | 96% | 49,516 psi | 90% | 3304 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 65% | 2169 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 46,804 psi | 85% | 3278 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 49,850 psi | 90% | 3383 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 47,659 psi | 86% | 3284 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 47,427 psi | 86% | 3304 fps | 97% |
| Rottweil R 902 | <<locked>> | 84% | 48,037 psi | 87% | 3176 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 88% | 46,746 psi | 85% | 3199 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 48,457 psi | 88% | 3199 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 48,051 psi | 87% | 3209 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 49,037 psi | 89% | 3215 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 48,153 psi | 87% | 3261 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 49,501 psi | 90% | 3219 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 47,108 psi | 85% | 3192 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 48,573 psi | 88% | 3127 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 49,226 psi | 89% | 3130 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 48,283 psi | 87% | 3123 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 49,052 psi | 89% | 3212 fps | 98.9% |
| Somchem S355 | <<locked>> | 88% | 47,166 psi | 85% | 3202 fps | 99% |
| Somchem S365 | <<locked>> | 98% | 48,617 psi | 88% | 3327 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 82% | 48,892 psi | 88% | 3117 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 47,747 psi | 86% | 3159 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 48,370 psi | 88% | 3166 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 48,631 psi | 88% | 3186 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 94% | 49,414 psi | 89% | 3255 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 86% | 49,980 psi | 90% | 3209 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 48,733 psi | 88% | 3258 fps | 97.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,353 psi | 80% | 3235 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 49,951 psi | 90% | 3235 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,245 psi | 66% | 3123 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 84% | 49,893 psi | 90% | 3258 fps | 99.4% |
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 2495 | <<locked>> | 80% | 42,090 psi | 76% | 3048 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 39,755 psi | 72% | 3035 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 38,783 psi | 70% | 3061 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 45,382 psi | 82% | 3163 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,638 psi | 70% | 2986 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,437 psi | 75% | 3182 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,319 psi | 69% | 3009 fps | 97.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,089 psi | 74% | 3084 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 38,435 psi | 70% | 3074 fps | 95.2% |
| Alliant Reloder-17 | 41.3 gr | 82% | 35,563 psi | 64% | 3022 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 96% | 35,491 psi | 64% | 3012 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 42,337 psi | 77% | 3248 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,744 psi | 81% | 3159 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 37,971 psi | 69% | 3009 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 82% | 41,510 psi | 75% | 3077 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 45,832 psi | 83% | 3179 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 33,185 psi | 60% | 2890 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,901 psi | 76% | 3136 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,194 psi | 47% | 1896 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,005 psi | 80% | 3123 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 45,484 psi | 82% | 3182 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,509 psi | 73% | 3028 fps | 96.7% |
| IMR 4831 | <<locked>> | 90% | 39,740 psi | 72% | 3071 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,119 psi | 76% | 3120 fps | 97.6% |
| Lovex D073.6 | <<locked>> | 80% | 44,802 psi | 81% | 3146 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 45,411 psi | 82% | 3100 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 40,567 psi | 73% | 3038 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 45,658 psi | 83% | 3140 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 44,556 psi | 81% | 3117 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 44,875 psi | 81% | 3127 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,480 psi | 73% | 3068 fps | 97.2% |
| Norma URP | <<locked>> | 88% | 38,725 psi | 70% | 3061 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,190 psi | 73% | 3077 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 94% | 46,296 psi | 84% | 3238 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 48% | 1946 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,497 psi | 79% | 3205 fps | 97.3% |
| ReloadSwiss RS 60 | 40.3 gr | 80% | 35,317 psi | 64% | 3035 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 41,379 psi | 75% | 3150 fps | 95.8% |
| ReloadSwiss RS 70 | 47.1 gr | 92% | 44,338 psi | 80% | 3228 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 42,206 psi | 76% | 3054 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 35,752 psi | 65% | 2946 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 45,658 psi | 83% | 3140 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,802 psi | 81% | 3146 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 40,567 psi | 73% | 3038 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,854 psi | 67% | 2999 fps | 95.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,948 psi | 83% | 3146 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,092 psi | 80% | 3127 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,600 psi | 83% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,029 psi | 69% | 2907 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 45,455 psi | 82% | 3071 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,556 psi | 82% | 3143 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 36,622 psi | 66% | 2956 fps | 96.5% |
| Somchem S365 | <<locked>> | 84% | 30,298 psi | 55% | 2864 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 45,934 psi | 83% | 3064 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,713 psi | 75% | 3045 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,438 psi | 77% | 3051 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,809 psi | 63% | 2881 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 40,611 psi | 73% | 3068 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 41,147 psi | 74% | 3035 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 40,030 psi | 72% | 3064 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 94% | 36,260 psi | 66% | 3041 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 33,214 psi | 60% | 2844 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 33,895 psi | 61% | 3041 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,598 psi | 79% | 3130 fps | 98.5% |
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 64 powders for .243 Ackley Improved loaded with the .243 | 77gr | Hasler ARIETE. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,383 fps; across all powders the maximum-charge window runs from 2,123 fps to 3,383 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 64 of the 64 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (381 MPa), the top charges use 64–90 %, leaving at least 10 % headroom. The 77.0 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-26, 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-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .243 Ackley Improved with the .243 | 77gr | Hasler ARIETE 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.