Load Specifications
Load data in caliber .243 Ackley Improved with .243 | 91gr | Peregrine Glider GRM bullet and 66 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.
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 2495 | <<locked>> | 82% | 47,239 psi | 85% | 2917 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 49,676 psi | 90% | 2963 fps | 96.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,976 psi | 81% | 2966 fps | 97% |
| Accurate 4064 | <<locked>> | 84% | 47,688 psi | 86% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 47,616 psi | 86% | 3045 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 86% | 49,255 psi | 89% | 3002 fps | 99.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 47,108 psi | 85% | 3097 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 49,240 psi | 89% | 3025 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 84% | 49,458 psi | 90% | 3041 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 49,298 psi | 89% | 3117 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 90% | 49,980 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,641 psi | 77% | 2995 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,747 psi | 88% | 3189 fps | 99.1% |
| Bofors RP3 | <<locked>> | 86% | 49,211 psi | 89% | 3028 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 49,705 psi | 90% | 3005 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 84% | 46,789 psi | 85% | 2982 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 90% | 46,963 psi | 85% | 3035 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 49,081 psi | 89% | 3041 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 47,979 psi | 87% | 3038 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 65% | 1949 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 49,255 psi | 89% | 3005 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 48,602 psi | 88% | 2982 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 47,950 psi | 87% | 2946 fps | 96.6% |
| IMR 4350 | <<locked>> | 92% | 47,050 psi | 85% | 2972 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 48,269 psi | 87% | 2976 fps | 96.6% |
| IMR 4831 | <<locked>> | 94% | 48,428 psi | 88% | 3041 fps | 99.1% |
| IMR 4895 | <<locked>> | 82% | 47,572 psi | 86% | 3015 fps | 99.6% |
| Lovex S062 | <<locked>> | 84% | 48,182 psi | 87% | 2972 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 47,747 psi | 86% | 2972 fps | 97.9% |
| Lovex S070 | <<locked>> | 92% | 48,747 psi | 88% | 3009 fps | 97.1% |
| Norma 201 | <<locked>> | 82% | 49,835 psi | 90% | 2995 fps | 100% |
| Norma 203B | <<locked>> | 84% | 48,762 psi | 88% | 3028 fps | 99.7% |
| Norma MRPᴾ | <<locked>> | 100% | 48,080 psi | 87% | 3136 fps | 96.7% |
| Norma URP | <<locked>> | 92% | 47,036 psi | 85% | 3035 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 84% | 49,081 psi | 89% | 3048 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 94% | 49,255 psi | 89% | 3087 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 65% | 1991 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 47,079 psi | 85% | 2959 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 49,690 psi | 90% | 3107 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 49,530 psi | 90% | 3143 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 47,471 psi | 86% | 3064 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 46,731 psi | 85% | 3084 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 82% | 47,123 psi | 85% | 2936 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 88% | 49,443 psi | 89% | 3028 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 90% | 49,705 psi | 90% | 3005 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 47,747 psi | 86% | 2972 fps | 97.9% |
| Shooters World Precision | <<locked>> | 84% | 48,182 psi | 87% | 2972 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 48,747 psi | 88% | 3009 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 47,863 psi | 87% | 3031 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 49,487 psi | 90% | 3015 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 48,588 psi | 88% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 47,529 psi | 86% | 2917 fps | 96.6% |
| Somchem S355 | <<locked>> | 88% | 50,009 psi | 90% | 3028 fps | 99.9% |
| Somchem S365 | <<locked>> | 96% | 48,820 psi | 88% | 3100 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 48,124 psi | 87% | 3022 fps | 96.1% |
| Vihtavuori N135 | <<locked>> | 82% | 46,992 psi | 85% | 2910 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 47,863 psi | 87% | 2927 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 47,906 psi | 87% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 49,342 psi | 89% | 3038 fps | 99% |
| Vihtavuori N540 | <<locked>> | 84% | 49,081 psi | 89% | 2966 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 48,443 psi | 88% | 3035 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,340 psi | 86% | 3081 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 49,240 psi | 89% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 47,297 psi | 86% | 3041 fps | 96.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,261 psi | 69% | 3009 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 82% | 49,255 psi | 89% | 3022 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% | 44,135 psi | 80% | 2864 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,325 psi | 84% | 2897 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 39,102 psi | 71% | 2841 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 41,800 psi | 76% | 2858 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,243 psi | 60% | 2723 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 40,611 psi | 73% | 2825 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,092 psi | 80% | 3035 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,495 psi | 73% | 2851 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,497 psi | 79% | 2923 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,359 psi | 60% | 2740 fps | 95.1% |
| Alliant Reloder-17 | 38.6 gr | 80% | 35,157 psi | 64% | 2818 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,777 psi | 56% | 2687 fps | 95.8% |
| Alliant Reloder-26 | 45.4 gr | 92% | 36,056 psi | 65% | 2894 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 40,292 psi | 73% | 2854 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 46,615 psi | 84% | 2943 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 41,031 psi | 74% | 2858 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 43,976 psi | 80% | 2972 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,487 psi | 55% | 2625 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,599 psi | 81% | 2972 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,527 psi | 48% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,166 psi | 84% | 2946 fps | 99.6% |
| IMR 4064 | <<locked>> | 80% | 42,670 psi | 77% | 2864 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,020 psi | 81% | 2887 fps | 95.8% |
| IMR 4350 | <<locked>> | 90% | 44,164 psi | 80% | 2913 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,554 psi | 77% | 2861 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 34,403 psi | 62% | 2736 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 44,585 psi | 81% | 2956 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 42,627 psi | 77% | 2867 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 39,740 psi | 72% | 2805 fps | 95.8% |
| Lovex S070 | <<locked>> | 88% | 42,902 psi | 78% | 2890 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 46,702 psi | 85% | 2936 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 42,830 psi | 78% | 2910 fps | 99% |
| Norma MRP | <<locked>> | 98% | 44,962 psi | 81% | 3071 fps | 95.8% |
| Norma URP | <<locked>> | 84% | 35,998 psi | 65% | 2792 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 42,830 psi | 78% | 2927 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 39,987 psi | 72% | 2890 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,760 psi | 48% | 1781 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,176 psi | 75% | 2835 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,456 psi | 84% | 3041 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,449 psi | 68% | 2890 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,433 psi | 64% | 2799 fps | 95.5% |
| ReloadSwiss RS 70 | 42.1 gr | 86% | 37,942 psi | 69% | 2877 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 44,164 psi | 80% | 2881 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,811 psi | 68% | 2792 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 46,615 psi | 84% | 2943 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,740 psi | 72% | 2805 fps | 95.8% |
| Shooters World Precision | <<locked>> | 80% | 42,627 psi | 77% | 2867 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 42,902 psi | 78% | 2890 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,073 psi | 71% | 2851 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,485 psi | 84% | 2959 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,132 psi | 73% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,727 psi | 76% | 2802 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 38,537 psi | 70% | 2799 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 28,050 psi | 51% | 2608 fps | 96.2% |
| Somchem S385 | <<locked>> | 96% | 45,049 psi | 82% | 2963 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 44,237 psi | 80% | 2861 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,831 psi | 81% | 2874 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,767 psi | 67% | 2730 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 35,085 psi | 63% | 2733 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 43,250 psi | 78% | 2861 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,519 psi | 62% | 2730 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 90% | 33,620 psi | 61% | 2776 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,547 psi | 59% | 2648 fps | 97% |
| Winchester 760 | <<locked>> | 88% | 43,976 psi | 80% | 2972 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,095 psi | 53% | 2710 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,195 psi | 84% | 2966 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 66 powders for .243 Ackley Improved loaded with the .243 | 91gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 3,189 fps; across all powders the maximum-charge window runs from 1,949 fps to 3,189 fps. Accurate 3100 gives the best case fill at 100 %, and 66 of the 66 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 Glider GRM 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.