Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 158gr | Prvi Partizan Grom 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 Alliant Reloder-33.
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% | 56,869 psi | 89% | 2976 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 3018 fps | 98% |
| Accurate MAGPRO | <<locked>> | 82% | 56,014 psi | 88% | 3091 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 57,609 psi | 90% | 3068 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,550 psi | 89% | 3087 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,231 psi | 88% | 3071 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,985 psi | 89% | 3205 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 94% | 56,173 psi | 88% | 3097 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,711 psi | 90% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,145 psi | 90% | 3054 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,145 psi | 90% | 3081 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,521 psi | 87% | 2979 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,463 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,027 psi | 86% | 3110 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,405 psi | 87% | 3104 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,681 psi | 89% | 3045 fps | 99.1% |
| Bofors RP15 | <<locked>> | 86% | 56,550 psi | 89% | 3071 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,289 psi | 88% | 3084 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,145 psi | 90% | 3081 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,667 psi | 90% | 3091 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,042 psi | 86% | 3012 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,099 psi | 85% | 2995 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,130 psi | 88% | 3156 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,072 psi | 60% | 1985 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,201 psi | 87% | 2992 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 55,114 psi | 86% | 3068 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,435 psi | 90% | 3002 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,114 psi | 86% | 3081 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,332 psi | 87% | 2956 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,623 psi | 89% | 3104 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,305 psi | 90% | 3091 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,768 psi | 89% | 3097 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,259 psi | 87% | 3018 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,059 psi | 61% | 2028 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,956 psi | 89% | 3140 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,043 psi | 88% | 3110 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 57,740 psi | 90% | 3035 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,116 psi | 90% | 3048 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 3028 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,739 psi | 89% | 3045 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,319 psi | 90% | 3012 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,377 psi | 90% | 2999 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,101 psi | 89% | 3038 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 82% | 57,043 psi | 89% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,536 psi | 89% | 3100 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 54,462 psi | 85% | 3041 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 56,304 psi | 88% | 3110 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 54,085 psi | 85% | 3117 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,782 psi | 89% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,203 psi | 90% | 3012 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% | 49,647 psi | 78% | 2864 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 42,351 psi | 66% | 2815 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 80% | 52,199 psi | 82% | 3025 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 80% | 53,824 psi | 84% | 3005 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,168 psi | 77% | 2959 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 36,840 psi | 58% | 2697 fps | 97.5% |
| ADI AR 2218 | 92.6 gr | 88% | 42,264 psi | 66% | 2900 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 34,229 psi | 54% | 2667 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 54,012 psi | 85% | 3002 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,490 psi | 84% | 2995 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,908 psi | 78% | 2959 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,602 psi | 76% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,830 psi | 67% | 2831 fps | 100% |
| Alliant Reloder-33 | 90 gr | 84% | 40,683 psi | 64% | 2822 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,179 psi | 69% | 2890 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,470 psi | 73% | 2861 fps | 97.2% |
| Bofors RP15 | <<locked>> | 80% | 46,528 psi | 73% | 2897 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 39,958 psi | 63% | 2776 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 49,908 psi | 78% | 2959 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,132 psi | 63% | 2776 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 51,401 psi | 81% | 2953 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,546 psi | 79% | 2936 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,032 psi | 66% | 2900 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,558 psi | 45% | 1775 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,721 psi | 81% | 2930 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 48,051 psi | 75% | 2946 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,940 psi | 85% | 2940 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,720 psi | 50% | 2579 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 42,830 psi | 67% | 2743 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,213 psi | 50% | 2608 fps | 97.6% |
| Norma MRP | <<locked>> | 80% | 53,534 psi | 84% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,921 psi | 77% | 2963 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 44,106 psi | 69% | 2828 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,356 psi | 46% | 1818 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,655 psi | 65% | 2871 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,392 psi | 60% | 2759 fps | 96.4% |
| Rottweil R 904 | <<locked>> | 80% | 54,056 psi | 85% | 2976 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 53,374 psi | 84% | 2989 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,527 psi | 70% | 2838 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,026 psi | 83% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,693 psi | 84% | 2956 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,137 psi | 74% | 2835 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 46,557 psi | 73% | 2848 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 53,563 psi | 84% | 2956 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,866 psi | 83% | 3038 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 44,338 psi | 69% | 2851 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 39,378 psi | 62% | 2779 fps | 96.2% |
| Vihtavuori N570 | 86.6 gr | 84% | 43,511 psi | 68% | 2907 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,878 psi | 77% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,748 psi | 78% | 2890 fps | 99.9% |
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 50 powders for 7 mm KM Katzmaier loaded with the .284 | 158gr | Prvi Partizan Grom. ADI AR 2218 delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,205 fps. Accurate 8700 gives the best case fill at 100 %, and 50 of the 50 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 158.0 gr projectile in 0.284" calls for a 1:11.0 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. ADI AR 2218, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 158gr | Prvi Partizan Grom 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.