Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 173gr | Sellier & Bellot SPCE bullet and 41 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>> | 82% | 56,507 psi | 89% | 2858 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 2986 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 56,304 psi | 88% | 2966 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,318 psi | 88% | 2959 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 57,319 psi | 90% | 3100 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 56,681 psi | 89% | 2986 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,942 psi | 89% | 2959 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,303 psi | 87% | 2858 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,579 psi | 89% | 2943 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,274 psi | 87% | 3005 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,869 psi | 88% | 3005 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,159 psi | 88% | 2930 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 56,521 psi | 89% | 2953 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,420 psi | 88% | 2972 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,942 psi | 89% | 2959 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,696 psi | 90% | 2972 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,377 psi | 90% | 2940 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,666 psi | 89% | 3041 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,159 psi | 60% | 1903 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,201 psi | 87% | 2956 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,942 psi | 89% | 2890 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,506 psi | 87% | 2972 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 54,665 psi | 86% | 2884 fps | 96% |
| Lovex S071 | <<locked>> | 86% | 55,201 psi | 87% | 2838 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,232 psi | 90% | 2992 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,666 psi | 89% | 2979 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,710 psi | 89% | 3025 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 84% | 55,172 psi | 86% | 2904 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,349 psi | 62% | 1949 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,377 psi | 90% | 3025 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,376 psi | 88% | 3002 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,665 psi | 86% | 2884 fps | 96% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,042 psi | 86% | 2930 fps | 98.7% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,156 psi | 82% | 2900 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 84% | 57,174 psi | 90% | 2884 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,768 psi | 89% | 2930 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 84% | 54,331 psi | 85% | 2927 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,695 psi | 89% | 3009 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 54,389 psi | 85% | 3012 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,116 psi | 90% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,536 psi | 89% | 2887 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% | 52,837 psi | 83% | 2802 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,885 psi | 63% | 2664 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 80% | 52,504 psi | 82% | 2907 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,668 psi | 62% | 2661 fps | 99% |
| ADI AR 2218 | 88.3 gr | 84% | 39,465 psi | 62% | 2740 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 37,086 psi | 58% | 2641 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,258 psi | 83% | 2904 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,866 psi | 81% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,122 psi | 72% | 2779 fps | 100% |
| Alliant Reloder-33 | 85.6 gr | 80% | 38,058 psi | 60% | 2661 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 86% | 41,684 psi | 65% | 2736 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,226 psi | 77% | 2812 fps | 98.6% |
| Bofors RP15 | <<locked>> | 80% | 49,632 psi | 78% | 2841 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,047 psi | 67% | 2736 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 53,258 psi | 83% | 2904 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,265 psi | 68% | 2733 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,650 psi | 84% | 2877 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,701 psi | 72% | 2861 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 45% | 1706 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,459 psi | 81% | 2894 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 46,876 psi | 73% | 2713 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,534 psi | 54% | 2559 fps | 97.3% |
| Lovex D100 | <<locked>> | 88% | 50,981 psi | 80% | 2818 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 45,687 psi | 72% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,259 psi | 55% | 2585 fps | 99.2% |
| Ramshot Grand | <<locked>> | 80% | 52,721 psi | 83% | 2917 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,808 psi | 83% | 2959 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 47,543 psi | 75% | 2782 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,602 psi | 46% | 1745 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,513 psi | 71% | 2835 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,771 psi | 65% | 2736 fps | 98.3% |
| Shooters World 50 BMG | <<locked>> | 88% | 50,981 psi | 80% | 2818 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,829 psi | 66% | 2684 fps | 95.6% |
| Vihtavuori 20N29 | <<locked>> | 98% | 48,660 psi | 76% | 2838 fps | 96% |
| Vihtavuori N165 | <<locked>> | 80% | 50,082 psi | 78% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,395 psi | 68% | 2687 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 80% | 47,543 psi | 75% | 2805 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 42,612 psi | 67% | 2749 fps | 98.1% |
| Vihtavuori N570 | 82.4 gr | 80% | 40,814 psi | 64% | 2743 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,156 psi | 83% | 2900 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,852 psi | 83% | 2835 fps | 100% |
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 41 powders for 7 mm KM Katzmaier loaded with the .284 | 173gr | Sellier & Bellot SPCE. ADI AR 2218 delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,100 fps. Accurate 8700 gives the best case fill at 100 %, and 41 of the 41 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 173.0 gr projectile in 0.284" calls for a 1:11.5 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, Alliant Reloder-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 173gr | Sellier & Bellot SPCE 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.