Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Speer TBBC 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.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 56,318 psi | 88% | 3123 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 54,418 psi | 85% | 3222 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 84% | 55,448 psi | 87% | 3228 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 57,130 psi | 90% | 3212 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,898 psi | 88% | 3228 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 55,085 psi | 86% | 3202 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 55,898 psi | 88% | 3323 fps | 98.3% |
| ADI AR 2225 | <<locked>> | 96% | 54,621 psi | 86% | 3228 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 57,406 psi | 90% | 3212 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,811 psi | 89% | 3202 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,463 psi | 88% | 3225 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,636 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,347 psi | 87% | 3202 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,274 psi | 87% | 3212 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 53,751 psi | 84% | 3228 fps | 97.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 53,853 psi | 84% | 3219 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,347 psi | 88% | 3179 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 55,869 psi | 88% | 3212 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,288 psi | 87% | 3222 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 56,463 psi | 88% | 3225 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,710 psi | 89% | 3228 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,868 psi | 86% | 3156 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,522 psi | 90% | 3202 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,305 psi | 90% | 3114 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,679 psi | 86% | 3297 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 59% | 2090 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,984 psi | 86% | 3133 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 86% | 54,520 psi | 85% | 3209 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3271 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 54,650 psi | 86% | 3094 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,027 psi | 86% | 3232 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,608 psi | 89% | 3238 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,840 psi | 88% | 3235 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 54,317 psi | 85% | 3153 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,812 psi | 61% | 2142 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,593 psi | 87% | 3274 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,882 psi | 86% | 3238 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 57,522 psi | 90% | 3179 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 56,710 psi | 89% | 3196 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,318 psi | 88% | 3189 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,274 psi | 87% | 3104 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,956 psi | 89% | 3159 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,116 psi | 90% | 3146 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,478 psi | 89% | 3163 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 84% | 56,478 psi | 89% | 3159 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,956 psi | 88% | 3241 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 57,334 psi | 90% | 3235 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 55,216 psi | 87% | 3241 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 56,710 psi | 89% | 3307 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,230 psi | 87% | 3219 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,797 psi | 89% | 3156 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% | 45,905 psi | 72% | 2943 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 50,676 psi | 79% | 3156 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 80% | 47,935 psi | 75% | 3087 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 80% | 50,009 psi | 78% | 3087 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 45,252 psi | 71% | 3025 fps | 98.2% |
| ADI AR 2217 | <<locked>> | 82% | 36,129 psi | 57% | 2805 fps | 95.8% |
| ADI AR 2218 | 99.7 gr | 94% | 48,182 psi | 76% | 3166 fps | 96.3% |
| ADI AR 2225 | <<locked>> | 80% | 31,154 psi | 49% | 2703 fps | 96.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 50,270 psi | 79% | 3084 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,792 psi | 78% | 3077 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,079 psi | 72% | 3031 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,773 psi | 70% | 2963 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,986 psi | 61% | 2897 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,358 psi | 80% | 3150 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 46,195 psi | 72% | 3077 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 96% | 49,806 psi | 78% | 3136 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,253 psi | 72% | 2989 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 42,888 psi | 67% | 2959 fps | 98.5% |
| Bofors RP30 | <<locked>> | 80% | 36,376 psi | 57% | 2822 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 46,079 psi | 72% | 3031 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 36,724 psi | 58% | 2825 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 80% | 47,718 psi | 75% | 3022 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,920 psi | 74% | 3005 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,737 psi | 84% | 3061 fps | 100% |
| Hodgdon Retumbo | 80.1 gr | 80% | 38,101 psi | 60% | 2946 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,443 psi | 76% | 3012 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 44,077 psi | 69% | 3005 fps | 97.9% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,331 psi | 55% | 2805 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 39,566 psi | 62% | 2812 fps | 99.5% |
| Norma 217 | <<locked>> | 82% | 31,038 psi | 49% | 2707 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 49,182 psi | 77% | 3110 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,469 psi | 70% | 3022 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 80% | 40,074 psi | 63% | 2884 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,080 psi | 46% | 1919 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,637 psi | 59% | 2917 fps | 99.1% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 40,422 psi | 63% | 2940 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 50,546 psi | 79% | 3058 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 49,472 psi | 78% | 3068 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,168 psi | 77% | 3064 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 51,735 psi | 81% | 3045 fps | 98.9% |
| Somchem S385 | <<locked>> | 80% | 49,937 psi | 78% | 3041 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 43,685 psi | 68% | 2907 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 52,881 psi | 83% | 3100 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 49,559 psi | 78% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,675 psi | 76% | 3104 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 40,640 psi | 64% | 2904 fps | 96.6% |
| Vihtavuori N568 | <<locked>> | 84% | 41,365 psi | 65% | 2956 fps | 95.5% |
| Vihtavuori N570 | 93.5 gr | 90% | 49,095 psi | 77% | 3163 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,830 psi | 69% | 3025 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,093 psi | 72% | 2966 fps | 99.2% |
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 | 140gr | Speer TBBC. ADI AR 2218 delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,323 fps. Hodgdon TrailBoss 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 140.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, IMR 8133 Enduron, 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 | 140gr | Speer TBBC 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.