Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 150gr | Swift Scirocco bullet and 50 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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 53,998 psi | 85% | 3002 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,501 psi | 78% | 3015 fps | 96.7% |
| Accurate MAGPRO | <<locked>> | 84% | 56,985 psi | 89% | 3173 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 54,824 psi | 86% | 3087 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,566 psi | 90% | 3169 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 56,884 psi | 89% | 3150 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,667 psi | 90% | 3281 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 96% | 56,304 psi | 88% | 3169 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,607 psi | 86% | 3077 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,230 psi | 85% | 3100 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,159 psi | 88% | 3061 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,000 psi | 89% | 3140 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,145 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,419 psi | 87% | 3179 fps | 98.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,680 psi | 87% | 3173 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,070 psi | 85% | 3061 fps | 98.3% |
| Bofors RP15 | <<locked>> | 88% | 57,435 psi | 90% | 3153 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,797 psi | 89% | 3159 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,230 psi | 85% | 3100 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,230 psi | 85% | 3107 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,086 psi | 88% | 3094 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,158 psi | 86% | 3077 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,362 psi | 88% | 3235 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,971 psi | 60% | 2024 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,347 psi | 88% | 3074 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 55,985 psi | 88% | 3153 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,376 psi | 87% | 3153 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,115 psi | 88% | 3035 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,753 psi | 89% | 3173 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,230 psi | 85% | 3114 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,551 psi | 90% | 3176 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,072 psi | 88% | 3097 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,928 psi | 61% | 2070 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,435 psi | 90% | 3219 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,652 psi | 89% | 3189 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 55,143 psi | 86% | 3058 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 82% | 54,447 psi | 85% | 3071 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,343 psi | 80% | 3028 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,740 psi | 90% | 3127 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,637 psi | 89% | 3048 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 54,607 psi | 86% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,839 psi | 86% | 3025 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,215 psi | 85% | 3048 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 82% | 54,288 psi | 85% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,580 psi | 90% | 3182 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 54,998 psi | 86% | 3114 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 92% | 57,014 psi | 89% | 3189 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 54,433 psi | 85% | 3189 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,174 psi | 90% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,462 psi | 85% | 3031 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% | 47,210 psi | 74% | 2887 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,832 psi | 72% | 2946 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 49,342 psi | 77% | 3035 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 51,314 psi | 80% | 3028 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,644 psi | 73% | 2976 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 34,795 psi | 55% | 2700 fps | 96% |
| ADI AR 2218 | 93.5 gr | 90% | 42,786 psi | 67% | 2969 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 32,068 psi | 50% | 2664 fps | 97.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,082 psi | 80% | 3018 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,413 psi | 74% | 2976 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,064 psi | 72% | 2900 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,292 psi | 63% | 2848 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,026 psi | 83% | 3087 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,237 psi | 69% | 2963 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,324 psi | 69% | 2953 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,469 psi | 70% | 2877 fps | 96% |
| Bofors RP15 | <<locked>> | 80% | 44,121 psi | 69% | 2910 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 37,608 psi | 59% | 2779 fps | 97.1% |
| Bofors RP5 | <<locked>> | 80% | 47,413 psi | 74% | 2976 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 37,898 psi | 59% | 2779 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 80% | 49,052 psi | 77% | 2969 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,211 psi | 76% | 2953 fps | 98.7% |
| Hodgdon Retumbo | 78.4 gr | 80% | 39,276 psi | 62% | 2900 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1814 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,559 psi | 78% | 2953 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 45,455 psi | 71% | 2956 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,113 psi | 53% | 2707 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 40,727 psi | 64% | 2762 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 29,950 psi | 47% | 2605 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 50,575 psi | 79% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,919 psi | 72% | 2972 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 80% | 41,394 psi | 65% | 2835 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 46% | 1857 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,001 psi | 61% | 2877 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,667 psi | 61% | 2825 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 51,721 psi | 81% | 2995 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,836 psi | 80% | 3009 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,906 psi | 75% | 2963 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,488 psi | 79% | 3005 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,924 psi | 83% | 2986 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 51,256 psi | 80% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,875 psi | 70% | 2854 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 50,560 psi | 79% | 2982 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 80% | 50,879 psi | 80% | 2982 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,038 psi | 78% | 3048 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,800 psi | 66% | 2858 fps | 97.6% |
| Vihtavuori N568 | <<locked>> | 82% | 39,798 psi | 62% | 2848 fps | 95.7% |
| Vihtavuori N570 | 89.5 gr | 88% | 47,021 psi | 74% | 3045 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,600 psi | 71% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,413 psi | 74% | 2910 fps | 99.6% |
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 57 powders for 7 mm KM Katzmaier loaded with the .284 | 150gr | Swift Scirocco. ADI AR 2218 delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 2,024 fps to 3,281 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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 1:9.5 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 7 mm KM Katzmaier with the .284 | 150gr | Swift Scirocco 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.