Load Specifications
Load data in caliber .244 H&H Mag. with .243 | 77gr | Lapua Open Tip bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 55,579 psi | 88% | 3094 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,459 psi | 82% | 3123 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 82% | 54,752 psi | 87% | 3205 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 56,246 psi | 89% | 3182 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,347 psi | 88% | 3205 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 54,636 psi | 87% | 3186 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,477 psi | 88% | 3317 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 94% | 54,549 psi | 86% | 3212 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,086 psi | 89% | 3176 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,956 psi | 89% | 3199 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,273 psi | 86% | 3100 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,868 psi | 87% | 3179 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 53,432 psi | 85% | 3219 fps | 98.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 53,650 psi | 85% | 3209 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,463 psi | 88% | 3159 fps | 98.6% |
| Bofors RP15 | <<locked>> | 86% | 55,434 psi | 88% | 3189 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,824 psi | 87% | 3202 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,956 psi | 89% | 3199 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,217 psi | 89% | 3209 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 53,911 psi | 85% | 3127 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,768 psi | 90% | 3176 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,476 psi | 86% | 3271 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,043 psi | 60% | 2073 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,012 psi | 86% | 3104 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 84% | 53,969 psi | 86% | 3189 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,347 psi | 89% | 3114 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 53,417 psi | 85% | 3189 fps | 99.9% |
| Lovex S071 | <<locked>> | 88% | 54,056 psi | 86% | 3071 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,013 psi | 87% | 3219 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,898 psi | 89% | 3212 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,245 psi | 88% | 3209 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 53,838 psi | 85% | 3133 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,943 psi | 62% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,274 psi | 88% | 3255 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,462 psi | 86% | 3222 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 82% | 56,507 psi | 90% | 3150 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 55,854 psi | 89% | 3166 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,200 psi | 84% | 3133 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,492 psi | 88% | 3163 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,144 psi | 89% | 3130 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,202 psi | 89% | 3117 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,637 psi | 88% | 3146 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 55,869 psi | 89% | 3130 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,230 psi | 88% | 3215 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 56,782 psi | 90% | 3215 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 54,911 psi | 87% | 3225 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 56,579 psi | 90% | 3301 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,201 psi | 87% | 3192 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,970 psi | 89% | 3127 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 48,544 psi | 77% | 2976 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 44,338 psi | 70% | 2982 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 51,068 psi | 81% | 3140 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 52,678 psi | 83% | 3120 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,138 psi | 76% | 3071 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 35,897 psi | 57% | 2789 fps | 96.6% |
| ADI AR 2218 | 69.1 gr | 90% | 44,353 psi | 70% | 3077 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 33,185 psi | 53% | 2756 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,402 psi | 83% | 3110 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,892 psi | 77% | 3071 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,572 psi | 75% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,669 psi | 66% | 2936 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 42,598 psi | 68% | 2989 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 92% | 46,253 psi | 73% | 3061 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,643 psi | 72% | 2969 fps | 96.6% |
| Bofors RP15 | <<locked>> | 80% | 45,440 psi | 72% | 3002 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 38,899 psi | 62% | 2871 fps | 97.6% |
| Bofors RP5 | <<locked>> | 80% | 48,892 psi | 77% | 3071 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 39,160 psi | 62% | 2874 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 80% | 50,285 psi | 80% | 3061 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,603 psi | 79% | 3048 fps | 99% |
| Hodgdon Retumbo | 57.9 gr | 80% | 40,741 psi | 65% | 2999 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 45% | 1854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,763 psi | 80% | 3045 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 46,905 psi | 74% | 3054 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,866 psi | 84% | 3051 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,127 psi | 53% | 2733 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 41,959 psi | 67% | 2848 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 31,169 psi | 49% | 2690 fps | 96.6% |
| Norma MRP | <<locked>> | 80% | 52,141 psi | 83% | 3146 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,529 psi | 75% | 3071 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 42,917 psi | 68% | 2930 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 47% | 1900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,466 psi | 64% | 2972 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,246 psi | 59% | 2851 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 53,040 psi | 84% | 3091 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 52,330 psi | 83% | 3107 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 46,456 psi | 74% | 3002 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,967 psi | 82% | 3100 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 52,678 psi | 83% | 3074 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,137 psi | 73% | 2940 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 48,602 psi | 77% | 3015 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 52,373 psi | 83% | 3074 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,517 psi | 82% | 3146 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 43,265 psi | 69% | 2953 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 38,232 psi | 61% | 2871 fps | 95.2% |
| Vihtavuori N570 | 64.6 gr | 86% | 45,353 psi | 72% | 3071 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,369 psi | 75% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,631 psi | 77% | 2999 fps | 99.8% |
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 55 powders for .244 H&H Mag. loaded with the .243 | 77gr | Lapua Open Tip. ADI AR 2218 delivers the highest muzzle velocity at 3,317 fps; across all powders the maximum-charge window runs from 2,073 fps to 3,317 fps. Accurate 8700 gives the best case fill at 100 %, and 55 of the 55 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (435 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 105.0 gr projectile in 0.243" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for .244 H&H Mag. with the .243 | 77gr | Lapua Open Tip they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.