Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 155gr | Frontier PH HPFB bullet and 51 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% | 54,868 psi | 86% | 2972 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,401 psi | 79% | 2995 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 82% | 53,969 psi | 85% | 3081 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 55,767 psi | 87% | 3061 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,491 psi | 85% | 3077 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 53,911 psi | 84% | 3061 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,462 psi | 85% | 3182 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 96% | 57,363 psi | 90% | 3140 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,912 psi | 88% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,376 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,085 psi | 86% | 3071 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,203 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,099 psi | 85% | 3054 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,521 psi | 89% | 3159 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,695 psi | 89% | 3153 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,853 psi | 86% | 3035 fps | 98.6% |
| Bofors RP15 | <<locked>> | 86% | 54,723 psi | 86% | 3068 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 53,983 psi | 85% | 3074 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,085 psi | 86% | 3071 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,303 psi | 87% | 3081 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,913 psi | 89% | 3064 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,956 psi | 88% | 3051 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,609 psi | 90% | 3209 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1991 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,087 psi | 89% | 3045 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,942 psi | 89% | 3123 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,782 psi | 87% | 2992 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,333 psi | 88% | 3127 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 56,985 psi | 89% | 3005 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,012 psi | 85% | 3091 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,143 psi | 86% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,491 psi | 85% | 3084 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,985 psi | 89% | 3071 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,059 psi | 61% | 2041 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,360 psi | 85% | 3130 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 53,548 psi | 84% | 3094 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 82% | 56,057 psi | 88% | 3028 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 55,245 psi | 87% | 3041 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,330 psi | 82% | 3009 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,882 psi | 86% | 3038 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,435 psi | 90% | 3018 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 55,564 psi | 87% | 3009 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,666 psi | 87% | 2999 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,969 psi | 86% | 3025 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 55,100 psi | 86% | 3005 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,505 psi | 85% | 3091 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 55,999 psi | 88% | 3087 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 54,056 psi | 85% | 3100 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 55,434 psi | 87% | 3166 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,201 psi | 85% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,288 psi | 87% | 3005 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% | 48,066 psi | 75% | 2864 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 43,468 psi | 68% | 2861 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 50,198 psi | 79% | 3012 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 80% | 52,011 psi | 82% | 2999 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,398 psi | 74% | 2949 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 35,375 psi | 55% | 2680 fps | 96.6% |
| ADI AR 2218 | 92.8 gr | 90% | 43,511 psi | 68% | 2953 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 32,750 psi | 51% | 2651 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,417 psi | 82% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,924 psi | 81% | 2992 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,153 psi | 75% | 2953 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,905 psi | 74% | 2871 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,002 psi | 64% | 2822 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 41,814 psi | 66% | 2874 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 92% | 45,266 psi | 71% | 2936 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,107 psi | 71% | 2851 fps | 96.5% |
| Bofors RP15 | <<locked>> | 80% | 44,802 psi | 70% | 2884 fps | 99.4% |
| Bofors RP30 | <<locked>> | 80% | 38,435 psi | 60% | 2762 fps | 97.6% |
| Bofors RP5 | <<locked>> | 80% | 48,153 psi | 75% | 2953 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 38,537 psi | 60% | 2759 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 80% | 49,719 psi | 78% | 2943 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,863 psi | 77% | 2927 fps | 99% |
| Hodgdon Retumbo | 77.9 gr | 80% | 40,205 psi | 63% | 2884 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 45% | 1785 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,183 psi | 79% | 2923 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 46,180 psi | 72% | 2930 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 88% | 52,315 psi | 82% | 2930 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 32,547 psi | 51% | 2628 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 41,336 psi | 65% | 2736 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 30,705 psi | 48% | 2592 fps | 96.7% |
| Norma MRP | <<locked>> | 80% | 51,416 psi | 81% | 3025 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,775 psi | 73% | 2949 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 42,206 psi | 66% | 2815 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,312 psi | 46% | 1827 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,711 psi | 62% | 2858 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,593 psi | 57% | 2740 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 52,533 psi | 82% | 2969 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 51,706 psi | 81% | 2982 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 45,629 psi | 72% | 2881 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,358 psi | 80% | 2979 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,635 psi | 84% | 2956 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 51,953 psi | 81% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,672 psi | 72% | 2828 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 48,066 psi | 75% | 2897 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 51,634 psi | 81% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,836 psi | 80% | 3022 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 42,670 psi | 67% | 2838 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 37,608 psi | 59% | 2759 fps | 95.2% |
| Vihtavuori N570 | 86.9 gr | 86% | 44,701 psi | 70% | 2953 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,615 psi | 73% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,080 psi | 75% | 2884 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 51 powders for 7 mm KM Katzmaier loaded with the .284 | 155gr | Frontier PH HPFB. Hodgdon Retumbo delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,991 fps to 3,209 fps. Accurate 8700 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 155.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, 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, Hodgdon Retumbo rank at the top here: for 7 mm KM Katzmaier with the .284 | 155gr | Frontier PH HPFB 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.