Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 158gr | Sellier & Bellot XRG 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, Hodgdon Retumbo 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 56,347 psi | 88% | 2969 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,257 psi | 82% | 3005 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 82% | 55,535 psi | 87% | 3081 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 57,087 psi | 89% | 3058 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,043 psi | 88% | 3081 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,550 psi | 87% | 3061 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,391 psi | 88% | 3196 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 94% | 55,463 psi | 87% | 3087 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,188 psi | 90% | 3054 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,188 psi | 90% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,623 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,637 psi | 89% | 3074 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,984 psi | 86% | 2976 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,753 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,404 psi | 85% | 3100 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,578 psi | 86% | 3094 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,130 psi | 88% | 3035 fps | 99% |
| Bofors RP15 | <<locked>> | 86% | 56,057 psi | 88% | 3061 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,767 psi | 87% | 3077 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,637 psi | 89% | 3074 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,942 psi | 89% | 3081 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,549 psi | 85% | 3005 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,392 psi | 90% | 3048 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,564 psi | 87% | 3150 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 60% | 1978 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,737 psi | 86% | 2982 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 54,592 psi | 86% | 3061 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,029 psi | 89% | 2992 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,447 psi | 85% | 3071 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 54,853 psi | 86% | 2949 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,941 psi | 88% | 3091 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,782 psi | 89% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,014 psi | 88% | 3084 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,563 psi | 86% | 3009 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,001 psi | 61% | 2024 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,420 psi | 88% | 3130 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,376 psi | 87% | 3100 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 57,261 psi | 90% | 3025 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,565 psi | 89% | 3038 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,114 psi | 85% | 3015 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,202 psi | 88% | 3038 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,811 psi | 89% | 3005 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,927 psi | 89% | 2992 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,507 psi | 89% | 3028 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 82% | 56,492 psi | 89% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,028 psi | 88% | 3091 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 57,537 psi | 90% | 3087 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,869 psi | 88% | 3107 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 57,305 psi | 90% | 3173 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,144 psi | 88% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,753 psi | 89% | 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% | 49,313 psi | 77% | 2861 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 45,005 psi | 71% | 2871 fps | 96% |
| Accurate MAGPRO | <<locked>> | 80% | 51,706 psi | 81% | 3018 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 80% | 53,301 psi | 84% | 2999 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,675 psi | 76% | 2949 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 80% | 36,434 psi | 57% | 2687 fps | 97.3% |
| ADI AR 2218 | 91.8 gr | 88% | 41,756 psi | 65% | 2890 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 33,794 psi | 53% | 2661 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,664 psi | 84% | 2999 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,664 psi | 84% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,156 psi | 83% | 2989 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,429 psi | 77% | 2949 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,240 psi | 76% | 2867 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,293 psi | 66% | 2825 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,410 psi | 68% | 2887 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 90% | 43,569 psi | 68% | 2877 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,108 psi | 72% | 2854 fps | 97.1% |
| Bofors RP15 | <<locked>> | 80% | 46,035 psi | 72% | 2887 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 39,624 psi | 62% | 2769 fps | 98.2% |
| Bofors RP5 | <<locked>> | 80% | 49,429 psi | 77% | 2949 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 39,668 psi | 62% | 2766 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 80% | 50,952 psi | 80% | 2943 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,082 psi | 78% | 2927 fps | 99.3% |
| Hodgdon Retumbo | 78.8 gr | 80% | 41,524 psi | 65% | 2890 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,572 psi | 45% | 1775 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,285 psi | 80% | 2923 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 47,543 psi | 75% | 2933 fps | 99.4% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,548 psi | 84% | 2933 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,707 psi | 53% | 2638 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 42,496 psi | 67% | 2736 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,865 psi | 50% | 2602 fps | 97.4% |
| Norma MRP | <<locked>> | 80% | 52,997 psi | 83% | 3025 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,356 psi | 76% | 2956 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 43,627 psi | 68% | 2818 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1814 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,162 psi | 65% | 2861 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,942 psi | 59% | 2749 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 80% | 53,722 psi | 84% | 2969 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 52,997 psi | 83% | 2982 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,005 psi | 69% | 2828 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,649 psi | 83% | 2979 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,171 psi | 83% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,833 psi | 73% | 2828 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 46,195 psi | 72% | 2841 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 52,968 psi | 83% | 2949 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,359 psi | 82% | 3028 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 80% | 43,888 psi | 69% | 2841 fps | 98.6% |
| Vihtavuori N568 | <<locked>> | 80% | 38,972 psi | 61% | 2769 fps | 96% |
| Vihtavuori N570 | 85.9 gr | 84% | 43,018 psi | 67% | 2897 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,254 psi | 76% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,269 psi | 77% | 2884 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 51 powders for 7 mm KM Katzmaier loaded with the .284 | 158gr | Sellier & Bellot XRG. ADI AR 2218 delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,196 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 60–90 %, leaving at least 10 % headroom. The 158.0 gr projectile in 0.284" calls for a 1:10.5 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, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for 7 mm KM Katzmaier with the .284 | 158gr | Sellier & Bellot XRG 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.