Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Impala RNFP KO bullet and 49 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 ReloadSwiss RS 76.
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% | 56,695 psi | 89% | 3117 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,430 psi | 81% | 3120 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 82% | 55,056 psi | 86% | 3215 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 82% | 56,231 psi | 88% | 3189 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,187 psi | 86% | 3209 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 92% | 54,563 psi | 86% | 3189 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 96% | 55,288 psi | 87% | 3307 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 94% | 54,360 psi | 85% | 3219 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 56,608 psi | 89% | 3189 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,086 psi | 88% | 3182 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,115 psi | 88% | 3205 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,665 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,071 psi | 86% | 3189 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,711 psi | 90% | 3291 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,520 psi | 85% | 3222 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,259 psi | 87% | 3156 fps | 98.1% |
| Bofors RP15 | <<locked>> | 86% | 55,564 psi | 87% | 3199 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,245 psi | 87% | 3212 fps | 99.8% |
| Bofors RP5 | <<locked>> | 84% | 56,115 psi | 88% | 3205 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,883 psi | 88% | 3209 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,624 psi | 90% | 3192 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,695 psi | 89% | 3176 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,259 psi | 85% | 3284 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,116 psi | 60% | 2093 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,595 psi | 90% | 3166 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 86% | 57,566 psi | 90% | 3255 fps | 99.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,464 psi | 90% | 3261 fps | 99.9% |
| Lovex S071 | <<locked>> | 88% | 55,245 psi | 87% | 3094 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,347 psi | 87% | 3228 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,260 psi | 88% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,230 psi | 87% | 3215 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 86% | 54,099 psi | 85% | 3140 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,117 psi | 61% | 2139 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,245 psi | 87% | 3264 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,969 psi | 86% | 3232 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 82% | 56,565 psi | 89% | 3156 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 82% | 56,188 psi | 88% | 3176 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,751 psi | 84% | 3136 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,811 psi | 87% | 3173 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,681 psi | 89% | 3143 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,594 psi | 89% | 3127 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,289 psi | 88% | 3153 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 82% | 56,652 psi | 89% | 3150 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,419 psi | 87% | 3222 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 88% | 57,392 psi | 90% | 3228 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 90% | 55,245 psi | 87% | 3235 fps | 99% |
| Vihtavuori N570 | <<locked>> | 92% | 56,623 psi | 89% | 3301 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,347 psi | 87% | 3212 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,202 psi | 88% | 3136 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% | 49,893 psi | 78% | 3005 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 48,051 psi | 75% | 3051 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 51,416 psi | 81% | 3146 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 80% | 52,823 psi | 83% | 3130 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 48,254 psi | 76% | 3081 fps | 98.8% |
| ADI AR 2217 | <<locked>> | 80% | 36,666 psi | 57% | 2808 fps | 96.1% |
| ADI AR 2218 | 97.1 gr | 92% | 47,892 psi | 75% | 3153 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 34,258 psi | 54% | 2789 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,127 psi | 83% | 3127 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,678 psi | 83% | 3120 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,313 psi | 77% | 3087 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,153 psi | 75% | 3012 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,308 psi | 66% | 2963 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 46,499 psi | 73% | 3077 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 92% | 47,355 psi | 74% | 3084 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,687 psi | 72% | 2969 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 46,006 psi | 72% | 3018 fps | 99.1% |
| Bofors RP30 | <<locked>> | 80% | 39,972 psi | 63% | 2904 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 49,313 psi | 77% | 3087 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 39,784 psi | 62% | 2890 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 80% | 50,618 psi | 79% | 3071 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,835 psi | 78% | 3054 fps | 98.6% |
| Hodgdon Retumbo | 79.7 gr | 80% | 41,307 psi | 65% | 3018 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,689 psi | 45% | 1877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,995 psi | 80% | 3051 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 80% | 47,050 psi | 74% | 3061 fps | 98.6% |
| IMR 8133 Enduron | <<locked>> | 82% | 34,301 psi | 54% | 2772 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 43,468 psi | 68% | 2881 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 32,605 psi | 51% | 2746 fps | 96.7% |
| Norma MRP | <<locked>> | 80% | 52,707 psi | 83% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,921 psi | 75% | 3084 fps | 99% |
| Ramshot Magnum | <<locked>> | 80% | 43,714 psi | 69% | 2953 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,501 psi | 46% | 1923 fps | 100% |
| ReloadSwiss RS 76 | 85.3 gr | 80% | 41,133 psi | 64% | 2995 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,406 psi | 60% | 2884 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 53,243 psi | 83% | 3097 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 52,678 psi | 83% | 3117 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 50,357 psi | 79% | 3074 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,315 psi | 82% | 3110 fps | 99.8% |
| Somchem S385 | <<locked>> | 80% | 53,272 psi | 83% | 3087 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,789 psi | 73% | 2959 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 52,707 psi | 83% | 3087 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 53,330 psi | 84% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,938 psi | 81% | 3159 fps | 99% |
| Vihtavuori N565 | <<locked>> | 80% | 44,382 psi | 70% | 2979 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 82% | 42,105 psi | 66% | 2966 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 86% | 46,064 psi | 72% | 3091 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,950 psi | 75% | 3097 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,226 psi | 77% | 3015 fps | 99.6% |
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 49 powders for 7 mm KM Katzmaier loaded with the .284 | 140gr | Impala RNFP KO. ADI AR 2218 delivers the highest muzzle velocity at 3,307 fps; across all powders the maximum-charge window runs from 2,093 fps to 3,307 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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 140.0 gr projectile in 0.284" calls for a 1:11.0 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, ReloadSwiss RS 76 rank at the top here: for 7 mm KM Katzmaier with the .284 | 140gr | Impala RNFP KO 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.