Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 150gr | Osprey Virtus bullet and 51 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>> | 86% | 55,767 psi | 87% | 3031 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 55,114 psi | 86% | 3143 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 57,101 psi | 89% | 3127 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,869 psi | 88% | 3146 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 54,940 psi | 86% | 3120 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 55,695 psi | 87% | 3248 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 96% | 54,404 psi | 85% | 3143 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 57,363 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,768 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,260 psi | 88% | 3136 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,491 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,129 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,042 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,522 psi | 90% | 3219 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3205 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,260 psi | 88% | 3100 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 55,666 psi | 87% | 3127 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,868 psi | 86% | 3133 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 56,260 psi | 88% | 3136 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,550 psi | 89% | 3146 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,694 psi | 86% | 3074 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,435 psi | 90% | 3117 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,130 psi | 90% | 3025 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,389 psi | 85% | 3209 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 59% | 2021 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,911 psi | 86% | 3048 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 54,215 psi | 85% | 3123 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3179 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 54,012 psi | 85% | 3005 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,592 psi | 86% | 3143 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,420 psi | 88% | 3153 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,651 psi | 87% | 3150 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 53,969 psi | 85% | 3068 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,696 psi | 61% | 2064 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,361 psi | 87% | 3192 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,404 psi | 85% | 3150 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 57,406 psi | 90% | 3097 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,347 psi | 88% | 3107 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2992 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,970 psi | 88% | 3100 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,100 psi | 86% | 3025 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 56,550 psi | 89% | 3071 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,782 psi | 89% | 3061 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,217 psi | 88% | 3084 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 84% | 56,057 psi | 88% | 3068 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,811 psi | 87% | 3156 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 90% | 56,855 psi | 89% | 3146 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 54,882 psi | 86% | 3156 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 94% | 56,449 psi | 88% | 3225 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,926 psi | 86% | 3130 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,652 psi | 89% | 3071 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% | 45,339 psi | 71% | 2858 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 47,688 psi | 75% | 3005 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 49,864 psi | 78% | 3005 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 45,005 psi | 71% | 2943 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 33,272 psi | 52% | 2661 fps | 95.1% |
| ADI AR 2218 | 94.8 gr | 92% | 44,251 psi | 69% | 3009 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 30,589 psi | 48% | 2625 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 50,111 psi | 79% | 3002 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,632 psi | 78% | 2995 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,672 psi | 72% | 2946 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,396 psi | 70% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,667 psi | 61% | 2815 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,952 psi | 80% | 3061 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,614 psi | 71% | 2995 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,397 psi | 71% | 2979 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,163 psi | 68% | 2851 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 42,395 psi | 66% | 2874 fps | 98.8% |
| Bofors RP30 | <<locked>> | 80% | 35,911 psi | 56% | 2740 fps | 96.4% |
| Bofors RP5 | <<locked>> | 80% | 45,672 psi | 72% | 2946 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 36,289 psi | 57% | 2746 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 80% | 47,456 psi | 74% | 2940 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,630 psi | 73% | 2927 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,606 psi | 84% | 2972 fps | 100% |
| Hodgdon Retumbo | 77.8 gr | 80% | 37,681 psi | 59% | 2864 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1811 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,283 psi | 76% | 2933 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,758 psi | 69% | 2927 fps | 98.4% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,867 psi | 55% | 2730 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,914 psi | 61% | 2726 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 30,400 psi | 48% | 2621 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 48,733 psi | 76% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,251 psi | 69% | 2940 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 80% | 39,755 psi | 62% | 2805 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,080 psi | 46% | 1854 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,202 psi | 58% | 2838 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 36,724 psi | 58% | 2782 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 50,372 psi | 79% | 2976 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 49,255 psi | 77% | 2982 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,064 psi | 72% | 2927 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,921 psi | 77% | 2979 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 51,416 psi | 81% | 2963 fps | 99.2% |
| Somchem S385 | <<locked>> | 80% | 49,487 psi | 78% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,381 psi | 68% | 2825 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 48,820 psi | 77% | 2953 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 49,052 psi | 77% | 2956 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,283 psi | 76% | 3018 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 80% | 40,074 psi | 63% | 2822 fps | 97.1% |
| Vihtavuori N568 | <<locked>> | 84% | 40,857 psi | 64% | 2877 fps | 96% |
| Vihtavuori N570 | 88.8 gr | 88% | 45,107 psi | 71% | 3005 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,468 psi | 68% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,905 psi | 72% | 2884 fps | 99.4% |
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 51 powders for 7 mm KM Katzmaier loaded with the .284 | 150gr | Osprey Virtus. ADI AR 2218 delivers the highest muzzle velocity at 3,248 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,248 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 51 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron 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 | Osprey Virtus 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.