Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 91gr | Peregrine VLR-4 bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and Alliant Reloder-26.
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% | 47,340 psi | 86% | 2920 fps | 100% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,614 psi | 83% | 2979 fps | 97.2% |
| Accurate 4064 | <<locked>> | 84% | 47,805 psi | 87% | 2972 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 47,979 psi | 87% | 3051 fps | 99% |
| ADI AR 2208 | <<locked>> | 86% | 49,255 psi | 89% | 3005 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 47,485 psi | 86% | 3110 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 49,617 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 49,835 psi | 90% | 3051 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 94% | 49,632 psi | 90% | 3127 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 46,775 psi | 85% | 3087 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,236 psi | 78% | 3012 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,327 psi | 89% | 3202 fps | 99.3% |
| Bofors RP3 | <<locked>> | 86% | 49,951 psi | 90% | 3045 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 50,009 psi | 90% | 3012 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 84% | 47,181 psi | 85% | 2989 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 90% | 47,645 psi | 86% | 3048 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 49,414 psi | 89% | 3048 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 48,370 psi | 88% | 3048 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 47,384 psi | 86% | 3071 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 65% | 1952 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 49,632 psi | 90% | 3015 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 48,950 psi | 89% | 2992 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 48,298 psi | 87% | 2956 fps | 96.7% |
| IMR 4350 | <<locked>> | 92% | 47,659 psi | 86% | 2986 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 88% | 48,892 psi | 88% | 2992 fps | 96.8% |
| IMR 4831 | <<locked>> | 94% | 48,747 psi | 88% | 3048 fps | 99.2% |
| IMR 4895 | <<locked>> | 82% | 47,979 psi | 87% | 3025 fps | 99.6% |
| Lovex S062 | <<locked>> | 84% | 48,573 psi | 88% | 2986 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 48,428 psi | 88% | 2989 fps | 98% |
| Lovex S070 | <<locked>> | 92% | 49,081 psi | 89% | 3018 fps | 97.2% |
| Norma 201 | <<locked>> | 82% | 49,864 psi | 90% | 2999 fps | 100% |
| Norma 203B | <<locked>> | 84% | 49,153 psi | 89% | 3035 fps | 99.7% |
| Norma MRPᴾ | <<locked>> | 100% | 48,660 psi | 88% | 3150 fps | 96.9% |
| Norma URP | <<locked>> | 92% | 47,413 psi | 86% | 3041 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 84% | 49,472 psi | 90% | 3054 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 94% | 49,516 psi | 90% | 3091 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 65% | 1995 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 47,732 psi | 86% | 2976 fps | 97.2% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 49,879 psi | 90% | 3153 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 47,834 psi | 87% | 3074 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 47,340 psi | 86% | 3100 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 82% | 47,514 psi | 86% | 2946 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 88% | 49,835 psi | 90% | 3035 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 90% | 50,009 psi | 90% | 3012 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 48,428 psi | 88% | 2989 fps | 98% |
| Shooters World Precision | <<locked>> | 84% | 48,573 psi | 88% | 2986 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 49,081 psi | 89% | 3018 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 48,225 psi | 87% | 3041 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 49,850 psi | 90% | 3025 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 48,950 psi | 89% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 48,211 psi | 87% | 2933 fps | 96.8% |
| Somchem S355 | <<locked>> | 86% | 47,282 psi | 86% | 2982 fps | 99.7% |
| Somchem S365 | <<locked>> | 96% | 49,182 psi | 89% | 3110 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 48,747 psi | 88% | 3038 fps | 96.3% |
| Vihtavuori N135 | <<locked>> | 82% | 47,427 psi | 86% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 48,225 psi | 87% | 2936 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 48,254 psi | 87% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 49,705 psi | 90% | 3045 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 84% | 49,443 psi | 89% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 48,762 psi | 88% | 3045 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,051 psi | 87% | 3094 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 49,443 psi | 89% | 3015 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 47,645 psi | 86% | 3048 fps | 96.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,725 psi | 70% | 3025 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 82% | 49,617 psi | 90% | 3028 fps | 99.9% |
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% | 44,280 psi | 80% | 2867 fps | 100% |
| Accurate 3100 | <<locked>> | 96% | 39,407 psi | 71% | 2848 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 41,901 psi | 76% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,605 psi | 61% | 2733 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 40,959 psi | 74% | 2838 fps | 98.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,469 psi | 80% | 3045 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,596 psi | 73% | 2854 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,540 psi | 79% | 2927 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,663 psi | 61% | 2753 fps | 95.3% |
| Alliant Reloder-17 | 38.9 gr | 80% | 35,476 psi | 64% | 2828 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,341 psi | 53% | 2644 fps | 95% |
| Alliant Reloder-26 | 45.8 gr | 92% | 36,564 psi | 66% | 2910 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 40,379 psi | 73% | 2858 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 44,063 psi | 80% | 2894 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 41,104 psi | 74% | 2864 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 44,324 psi | 80% | 2982 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,790 psi | 52% | 2575 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,991 psi | 81% | 2982 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 44,106 psi | 80% | 3002 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 48% | 1745 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,572 psi | 84% | 2956 fps | 99.7% |
| IMR 4064 | <<locked>> | 80% | 43,033 psi | 78% | 2874 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,368 psi | 82% | 2897 fps | 96% |
| IMR 4350 | <<locked>> | 90% | 44,469 psi | 80% | 2923 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,873 psi | 78% | 2871 fps | 95.1% |
| IMR 4831 | <<locked>> | 84% | 34,737 psi | 63% | 2746 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 44,657 psi | 81% | 2959 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 42,714 psi | 77% | 2871 fps | 99.6% |
| Lovex S065 | <<locked>> | 82% | 37,333 psi | 68% | 2749 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 43,221 psi | 78% | 2900 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 46,804 psi | 85% | 2943 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 42,931 psi | 78% | 2913 fps | 99% |
| Norma MRP | <<locked>> | 98% | 45,223 psi | 82% | 3077 fps | 95.9% |
| Norma URP | <<locked>> | 82% | 33,968 psi | 61% | 2740 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 43,178 psi | 78% | 2936 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 40,553 psi | 73% | 2907 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 49% | 1785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,510 psi | 75% | 2844 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,782 psi | 68% | 2900 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 36,027 psi | 65% | 2818 fps | 95.8% |
| ReloadSwiss RS 70 | 42.4 gr | 86% | 38,189 psi | 69% | 2887 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 44,585 psi | 81% | 2890 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 37,913 psi | 69% | 2799 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 86% | 44,063 psi | 80% | 2894 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,333 psi | 68% | 2749 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 42,714 psi | 77% | 2871 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 43,221 psi | 78% | 2900 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,160 psi | 71% | 2851 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,528 psi | 84% | 2963 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,205 psi | 73% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,032 psi | 76% | 2808 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 38,653 psi | 70% | 2805 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 28,137 psi | 51% | 2612 fps | 96.3% |
| Somchem S385 | <<locked>> | 96% | 45,353 psi | 82% | 2972 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 44,382 psi | 80% | 2867 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,889 psi | 81% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,811 psi | 67% | 2733 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 35,433 psi | 64% | 2743 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 43,265 psi | 78% | 2864 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,838 psi | 63% | 2740 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 31,676 psi | 57% | 2720 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,793 psi | 59% | 2654 fps | 97.1% |
| Winchester 760 | <<locked>> | 88% | 44,657 psi | 81% | 2989 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,530 psi | 53% | 2730 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,572 psi | 84% | 2972 fps | 99.7% |
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 65 powders for .243 Ackley Improved loaded with the .243 | 91gr | Peregrine VLR-4. Alliant Reloder-26 delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,952 fps to 3,202 fps. Accurate 3100 gives the best case fill at 100 %, and 65 of the 65 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 91.0 gr projectile in 0.243" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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. ReloadSwiss RS 70, Alliant Reloder-17, Alliant Reloder-26 rank at the top here: for .243 Ackley Improved with the .243 | 91gr | Peregrine VLR-4 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.