Load Specifications
Load data in caliber .244 H&H Mag. with .243 | 90gr | Impala RNFP KO bullet and 46 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Hodgdon Retumbo.
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% | 54,998 psi | 87% | 3271 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 56,811 psi | 90% | 3428 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 82% | 54,665 psi | 87% | 3346 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 86% | 56,985 psi | 90% | 3425 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 94% | 56,159 psi | 89% | 3399 fps | 99.7% |
| ADI AR 2218 | <<locked>> | 96% | 53,171 psi | 84% | 3438 fps | 96.8% |
| ADI AR 2225 | <<locked>> | 96% | 55,753 psi | 88% | 3432 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,404 psi | 86% | 3337 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,201 psi | 86% | 3360 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,318 psi | 89% | 3330 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,652 psi | 90% | 3406 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,361 psi | 88% | 3432 fps | 97.2% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,057 psi | 89% | 3432 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 53,534 psi | 85% | 3301 fps | 97.1% |
| Bofors RP15 | <<locked>> | 86% | 53,693 psi | 85% | 3346 fps | 99.7% |
| Bofors RP30 | <<locked>> | 92% | 56,826 psi | 90% | 3422 fps | 99.7% |
| Bofors RP5 | <<locked>> | 84% | 54,201 psi | 86% | 3360 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 90% | 53,809 psi | 85% | 3356 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 84% | 55,825 psi | 88% | 3346 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,897 psi | 87% | 3330 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,724 psi | 88% | 3501 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,000 psi | 60% | 2221 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,043 psi | 89% | 3320 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 86% | 55,608 psi | 88% | 3409 fps | 99.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,201 psi | 87% | 3409 fps | 99.6% |
| Lovex S071 | <<locked>> | 90% | 56,898 psi | 90% | 3304 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,724 psi | 90% | 3438 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,317 psi | 86% | 3379 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,000 psi | 90% | 3432 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 88% | 55,767 psi | 88% | 3353 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,088 psi | 62% | 2274 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,753 psi | 90% | 3481 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,666 psi | 90% | 3445 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 82% | 55,201 psi | 87% | 3314 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 82% | 54,302 psi | 86% | 3327 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 53,925 psi | 85% | 3323 fps | 99.7% |
| Somchem S361 | <<locked>> | 82% | 56,579 psi | 90% | 3297 fps | 99.1% |
| Somchem S385 | <<locked>> | 82% | 54,897 psi | 87% | 3297 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,752 psi | 87% | 3281 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 82% | 54,781 psi | 87% | 3310 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 53,577 psi | 85% | 3369 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 88% | 55,361 psi | 88% | 3373 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 92% | 56,840 psi | 90% | 3445 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 92% | 54,201 psi | 86% | 3438 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,985 psi | 90% | 3432 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,563 psi | 86% | 3291 fps | 99.8% |
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% | 48,254 psi | 76% | 3150 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 49,632 psi | 79% | 3291 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 51,111 psi | 81% | 3278 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 46,630 psi | 74% | 3222 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 37,768 psi | 60% | 2995 fps | 95.6% |
| ADI AR 2218 | 73.1 gr | 94% | 49,400 psi | 78% | 3353 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 33,127 psi | 53% | 2904 fps | 96.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,010 psi | 81% | 3271 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,688 psi | 76% | 3228 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,543 psi | 74% | 3163 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,596 psi | 64% | 3097 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 90% | 47,892 psi | 76% | 3278 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 52,127 psi | 83% | 3353 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 47,340 psi | 75% | 3169 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 44,498 psi | 71% | 3156 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 38,392 psi | 61% | 3025 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 47,688 psi | 76% | 3228 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 38,348 psi | 61% | 3015 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 80% | 49,168 psi | 78% | 3215 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,254 psi | 76% | 3196 fps | 97.7% |
| Hodgdon Retumbo | 58.8 gr | 80% | 39,842 psi | 63% | 3150 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,660 psi | 45% | 1995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,559 psi | 79% | 3199 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 45,455 psi | 72% | 3202 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 86% | 37,536 psi | 59% | 3018 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 42,119 psi | 67% | 3022 fps | 99.5% |
| Norma 217 | <<locked>> | 82% | 33,344 psi | 53% | 2917 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 50,807 psi | 81% | 3314 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 46,035 psi | 73% | 3222 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 80% | 42,047 psi | 67% | 3084 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,501 psi | 47% | 2044 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,523 psi | 63% | 3123 fps | 99% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 42,525 psi | 67% | 3150 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 51,692 psi | 82% | 3248 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 51,082 psi | 81% | 3268 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,720 psi | 80% | 3261 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 52,953 psi | 84% | 3232 fps | 98.6% |
| Somchem S385 | <<locked>> | 80% | 51,706 psi | 82% | 3241 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 45,237 psi | 72% | 3097 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 51,561 psi | 82% | 3251 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,140 psi | 79% | 3304 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 42,685 psi | 68% | 3107 fps | 96.6% |
| Vihtavuori N568 | <<locked>> | 84% | 43,308 psi | 69% | 3163 fps | 95.4% |
| Vihtavuori N570 | 68.6 gr | 90% | 50,633 psi | 80% | 3366 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,716 psi | 72% | 3238 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,761 psi | 76% | 3159 fps | 99% |
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 | 90gr | Impala RNFP KO. Hodgdon Retumbo delivers the highest muzzle velocity at 3,501 fps; across all powders the maximum-charge window runs from 2,221 fps to 3,501 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 90.0 gr projectile in 0.243" calls for a 1:8.5 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for .244 H&H Mag. with the .243 | 90gr | Impala RNFP KO they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, IMR 7977 Enduron, Lovex D100 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.