Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 150gr | Sierra GameKing 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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 55,550 psi | 87% | 3022 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,503 psi | 81% | 3051 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 82% | 54,708 psi | 86% | 3133 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 56,391 psi | 88% | 3114 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,361 psi | 87% | 3133 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 54,926 psi | 86% | 3117 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,463 psi | 87% | 3238 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 94% | 54,650 psi | 86% | 3140 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,941 psi | 88% | 3100 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,970 psi | 88% | 3127 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,215 psi | 85% | 3031 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,085 psi | 86% | 3110 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,624 psi | 90% | 3215 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 53,795 psi | 84% | 3136 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,492 psi | 87% | 3087 fps | 98.6% |
| Bofors RP15 | <<locked>> | 86% | 55,390 psi | 87% | 3117 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,868 psi | 86% | 3127 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,970 psi | 88% | 3127 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,115 psi | 88% | 3133 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,711 psi | 90% | 3120 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,768 psi | 89% | 3107 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,534 psi | 85% | 3199 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,043 psi | 60% | 2034 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,725 psi | 90% | 3097 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 53,896 psi | 84% | 3114 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,492 psi | 89% | 3045 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,334 psi | 90% | 3182 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 57,609 psi | 90% | 3054 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,114 psi | 86% | 3143 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,014 psi | 88% | 3140 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,347 psi | 87% | 3140 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 53,824 psi | 84% | 3061 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,001 psi | 61% | 2080 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,535 psi | 87% | 3186 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,694 psi | 86% | 3150 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 56,652 psi | 89% | 3084 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 55,854 psi | 88% | 3094 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,301 psi | 84% | 3061 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,492 psi | 87% | 3094 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,101 psi | 88% | 3061 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,246 psi | 88% | 3048 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,898 psi | 88% | 3077 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 55,825 psi | 87% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,303 psi | 87% | 3146 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 56,797 psi | 89% | 3143 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 55,085 psi | 86% | 3156 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 56,637 psi | 89% | 3225 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,143 psi | 86% | 3123 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,057 psi | 88% | 3061 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 48,544 psi | 76% | 2910 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 44,280 psi | 69% | 2910 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 50,995 psi | 80% | 3068 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 80% | 52,707 psi | 83% | 3054 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,022 psi | 75% | 3002 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 35,926 psi | 56% | 2730 fps | 96.6% |
| ADI AR 2218 | 96 gr | 90% | 44,309 psi | 69% | 3005 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 33,272 psi | 52% | 2697 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,402 psi | 82% | 3041 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,776 psi | 76% | 3002 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,514 psi | 74% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,684 psi | 65% | 2874 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 42,627 psi | 67% | 2923 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 92% | 46,369 psi | 73% | 2992 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,600 psi | 71% | 2904 fps | 96.5% |
| Bofors RP15 | <<locked>> | 80% | 45,469 psi | 71% | 2936 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 38,899 psi | 61% | 2808 fps | 97.6% |
| Bofors RP5 | <<locked>> | 80% | 48,776 psi | 76% | 3002 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 39,088 psi | 61% | 2808 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 80% | 50,314 psi | 79% | 2995 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,443 psi | 77% | 2979 fps | 99% |
| Hodgdon Retumbo | 80.6 gr | 80% | 40,814 psi | 64% | 2936 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,529 psi | 45% | 1824 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,763 psi | 80% | 2979 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 46,862 psi | 73% | 2986 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,910 psi | 83% | 2982 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,127 psi | 52% | 2674 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 41,930 psi | 66% | 2785 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 31,198 psi | 49% | 2635 fps | 96.6% |
| Norma MRP | <<locked>> | 80% | 52,170 psi | 82% | 3077 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,558 psi | 75% | 3002 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 42,989 psi | 67% | 2867 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,298 psi | 46% | 1867 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,437 psi | 63% | 2907 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,260 psi | 58% | 2785 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 53,040 psi | 83% | 3022 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 52,243 psi | 82% | 3035 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 46,369 psi | 73% | 2930 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,895 psi | 81% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 52,562 psi | 82% | 3002 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,122 psi | 72% | 2874 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 48,776 psi | 76% | 2949 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 52,417 psi | 82% | 3005 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,547 psi | 81% | 3077 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 43,236 psi | 68% | 2887 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 38,363 psi | 60% | 2812 fps | 95.2% |
| Vihtavuori N570 | 89.9 gr | 86% | 45,498 psi | 71% | 3009 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,369 psi | 74% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,791 psi | 76% | 2936 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 49 powders for 7 mm KM Katzmaier loaded with the .284 | 150gr | Sierra GameKing. ADI AR 2218 delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 2,034 fps to 3,238 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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 7 mm KM Katzmaier with the .284 | 150gr | Sierra GameKing 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.