Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 171gr | Barnes Match Burner BT bullet and 84 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-50.
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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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>> | 82% | 55,230 psi | 87% | 2854 fps | 100% |
| Accurate 3100 | <<locked>> | 82% | 55,448 psi | 87% | 2858 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,434 psi | 87% | 2969 fps | 99% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 2979 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 82% | 55,390 psi | 87% | 2979 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 82% | 55,390 psi | 87% | 2979 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 82% | 54,752 psi | 86% | 2956 fps | 100% |
| ADI AR 2213 | <<locked>> | 82% | 55,172 psi | 86% | 2966 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 54,752 psi | 86% | 2953 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 55,143 psi | 86% | 2956 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 55,259 psi | 87% | 3084 fps | 99.6% |
| ADI AR 2218 | <<locked>> | 94% | 55,811 psi | 87% | 3091 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 92% | 54,694 psi | 86% | 2972 fps | 100% |
| ADI AR 2225 | <<locked>> | 92% | 55,274 psi | 87% | 2982 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 55,419 psi | 87% | 2953 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 55,825 psi | 87% | 2959 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 57,551 psi | 90% | 2907 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 54,360 psi | 85% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 54,984 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 55,376 psi | 87% | 2943 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 57,522 psi | 90% | 3058 fps | 99.5% |
| Alliant Reloder-33 | <<locked>> | 90% | 53,954 psi | 85% | 2999 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 94% | 53,853 psi | 84% | 2989 fps | 98.7% |
| Alliant Reloder-50 | <<locked>> | 94% | 54,360 psi | 85% | 2999 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 54,795 psi | 86% | 2920 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,114 psi | 86% | 2927 fps | 99.3% |
| Bofors RP15 | <<locked>> | 84% | 55,042 psi | 86% | 2946 fps | 100% |
| Bofors RP15 | <<locked>> | 84% | 55,419 psi | 87% | 2953 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 54,911 psi | 86% | 2966 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 55,303 psi | 87% | 2969 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 55,419 psi | 87% | 2953 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 55,825 psi | 87% | 2959 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,318 psi | 88% | 2969 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 56,333 psi | 88% | 2969 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,319 psi | 90% | 2949 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 57,319 psi | 90% | 2949 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,970 psi | 88% | 2930 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 56,333 psi | 88% | 2936 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 54,853 psi | 86% | 3031 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 55,332 psi | 87% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,174 psi | 60% | 1909 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,218 psi | 60% | 1913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,826 psi | 89% | 2920 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 57,188 psi | 90% | 2927 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 57,145 psi | 90% | 3002 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 54,027 psi | 85% | 2953 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,753 psi | 87% | 2884 fps | 97% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,883 psi | 88% | 2887 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 96% | 57,508 psi | 90% | 3018 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 94% | 54,186 psi | 85% | 2966 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 57,261 psi | 90% | 2940 fps | 96.3% |
| Lovex D100 | <<locked>> | 92% | 57,537 psi | 90% | 2943 fps | 96.4% |
| Lovex S071 | <<locked>> | 88% | 57,319 psi | 90% | 2884 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 57,711 psi | 90% | 2890 fps | 100% |
| Norma 217 | <<locked>> | 94% | 55,419 psi | 87% | 2982 fps | 100% |
| Norma 217 | <<locked>> | 94% | 55,796 psi | 87% | 2989 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 55,390 psi | 87% | 2972 fps | 100% |
| Ramshot Magnum | <<locked>> | 82% | 54,607 psi | 86% | 2910 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 53,838 psi | 84% | 2897 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,218 psi | 61% | 1952 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,233 psi | 61% | 1955 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 55,477 psi | 87% | 3015 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 55,883 psi | 88% | 3018 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 54,491 psi | 85% | 2989 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 54,839 psi | 86% | 2995 fps | 99.9% |
| Shooters World 50 BMG | <<locked>> | 92% | 57,261 psi | 90% | 2940 fps | 96.3% |
| Shooters World 50 BMG | <<locked>> | 92% | 57,537 psi | 90% | 2943 fps | 96.4% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 57,029 psi | 89% | 2976 fps | 98.9% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 2982 fps | 99% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 50,372 psi | 79% | 2881 fps | 96.3% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 50,836 psi | 80% | 2890 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 84% | 55,811 psi | 87% | 2881 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 56,159 psi | 88% | 2884 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 55,303 psi | 87% | 2920 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 88% | 55,637 psi | 87% | 2923 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 86% | 56,594 psi | 89% | 2976 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 56,927 psi | 89% | 2982 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 54,969 psi | 86% | 2995 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 88% | 55,376 psi | 87% | 3002 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 90% | 56,536 psi | 89% | 3064 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 90% | 56,898 psi | 89% | 3068 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 82% | 55,419 psi | 87% | 2949 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 82% | 55,680 psi | 87% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 55,506 psi | 87% | 2890 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% | 51,561 psi | 81% | 2799 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 51,953 psi | 81% | 2805 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 41,263 psi | 65% | 2710 fps | 95.6% |
| Accurate 8700 | <<locked>> | 92% | 41,698 psi | 65% | 2720 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 51,532 psi | 81% | 2913 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 80% | 51,532 psi | 81% | 2913 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 51,198 psi | 80% | 2900 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 51,430 psi | 81% | 2904 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 38,522 psi | 60% | 2651 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 38,711 psi | 61% | 2654 fps | 98.7% |
| ADI AR 2218 | 89.4 gr | 86% | 41,118 psi | 64% | 2795 fps | 96.2% |
| ADI AR 2218 | 87.3 gr | 84% | 38,464 psi | 60% | 2726 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 35,781 psi | 56% | 2625 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 80% | 36,114 psi | 57% | 2631 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,924 psi | 81% | 2897 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,156 psi | 82% | 2900 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 50,517 psi | 79% | 2805 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 50,923 psi | 80% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,788 psi | 70% | 2772 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,005 psi | 71% | 2776 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 82% | 39,668 psi | 62% | 2717 fps | 95.5% |
| Alliant Reloder-33 | <<locked>> | 82% | 40,001 psi | 63% | 2723 fps | 95.7% |
| Alliant Reloder-50 | 90.8 gr | 86% | 40,074 psi | 63% | 2713 fps | 95% |
| Alliant Reloder-50 | 90.8 gr | 86% | 40,538 psi | 64% | 2726 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,066 psi | 75% | 2802 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,385 psi | 76% | 2808 fps | 98.3% |
| Bofors RP15 | <<locked>> | 80% | 48,356 psi | 76% | 2831 fps | 100% |
| Bofors RP15 | <<locked>> | 80% | 48,588 psi | 76% | 2838 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 41,814 psi | 66% | 2726 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 42,177 psi | 66% | 2733 fps | 99.3% |
| Bofors RP5 | <<locked>> | 80% | 51,924 psi | 81% | 2897 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 52,156 psi | 82% | 2900 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,581 psi | 62% | 2677 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 42,206 psi | 66% | 2730 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 80% | 47,094 psi | 74% | 2779 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 80% | 53,548 psi | 84% | 2890 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,417 psi | 82% | 2874 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,649 psi | 83% | 2877 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 44,034 psi | 69% | 2844 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 44,483 psi | 70% | 2854 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 45% | 1709 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,718 psi | 45% | 1709 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,388 psi | 84% | 2864 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,592 psi | 84% | 2867 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 53,243 psi | 83% | 2940 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 50,343 psi | 79% | 2890 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 84% | 48,921 psi | 77% | 2762 fps | 95.3% |
| IMR 7977 Enduron | <<locked>> | 84% | 49,240 psi | 77% | 2769 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 80% | 33,359 psi | 52% | 2546 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 33,707 psi | 53% | 2552 fps | 96.9% |
| Lovex D100 | <<locked>> | 90% | 53,330 psi | 84% | 2874 fps | 95.4% |
| Lovex D100 | <<locked>> | 90% | 53,621 psi | 84% | 2877 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 44,585 psi | 70% | 2684 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 44,802 psi | 70% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,997 psi | 53% | 2572 fps | 98.9% |
| Norma 217 | <<locked>> | 80% | 34,374 psi | 54% | 2579 fps | 99% |
| Ramshot Grand | <<locked>> | 80% | 51,503 psi | 81% | 2913 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 50,647 psi | 79% | 2851 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 46,485 psi | 73% | 2779 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,602 psi | 46% | 1752 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,544 psi | 46% | 1752 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,932 psi | 69% | 2825 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 44,338 psi | 69% | 2831 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 40,393 psi | 63% | 2720 fps | 97.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 40,727 psi | 64% | 2726 fps | 98% |
| Shooters World 50 BMG | <<locked>> | 90% | 53,330 psi | 84% | 2874 fps | 95.4% |
| Shooters World 50 BMG | <<locked>> | 90% | 53,621 psi | 84% | 2877 fps | 95.5% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 43,410 psi | 68% | 2733 fps | 95.9% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 40,799 psi | 64% | 2674 fps | 95% |
| Vihtavuori 20N29 | <<locked>> | 98% | 46,949 psi | 74% | 2818 fps | 95.3% |
| Vihtavuori 20N29 | <<locked>> | 98% | 47,384 psi | 74% | 2828 fps | 95.4% |
| Vihtavuori N165 | <<locked>> | 80% | 48,907 psi | 77% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 49,269 psi | 77% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 45,165 psi | 71% | 2733 fps | 95.9% |
| Vihtavuori N170 | <<locked>> | 80% | 42,540 psi | 67% | 2680 fps | 95% |
| Vihtavuori N565 | <<locked>> | 80% | 46,151 psi | 72% | 2795 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 46,543 psi | 73% | 2805 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 80% | 41,263 psi | 65% | 2736 fps | 97.6% |
| Vihtavuori N568 | <<locked>> | 80% | 41,597 psi | 65% | 2743 fps | 97.7% |
| Vihtavuori N570 | 83.5 gr | 82% | 42,395 psi | 66% | 2792 fps | 96% |
| Vihtavuori N570 | 81.5 gr | 80% | 39,784 psi | 62% | 2733 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 51,285 psi | 80% | 2890 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 51,779 psi | 81% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,837 psi | 81% | 2831 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 84 powders for 7 mm KM Katzmaier loaded with the .284 | 171gr | Barnes Match Burner BT. ADI AR 2218 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,091 fps. Accurate 8700 gives the best case fill at 100 %, and 84 of the 84 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. Accurate 8700, Accurate 8700, Hodgdon TrailBoss 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-50 rank at the top here: for 7 mm KM Katzmaier with the .284 | 171gr | Barnes Match Burner BT 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.