Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 130gr | Speer Hot-Cor bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, 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.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 54,694 psi | 86% | 3186 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 53,809 psi | 84% | 3287 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 84% | 55,651 psi | 87% | 3281 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 86% | 54,389 psi | 85% | 3291 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 96% | 57,537 psi | 90% | 3333 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 54,143 psi | 85% | 3369 fps | 97.3% |
| ADI AR 2225 | <<locked>> | 98% | 56,666 psi | 89% | 3353 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,376 psi | 87% | 3271 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,926 psi | 86% | 3287 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,724 psi | 89% | 3255 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,363 psi | 90% | 3330 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,519 psi | 84% | 3278 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,159 psi | 88% | 3353 fps | 97.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 3337 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,042 psi | 86% | 3241 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 54,346 psi | 85% | 3278 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 57,377 psi | 90% | 3343 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 54,926 psi | 86% | 3287 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 92% | 54,955 psi | 86% | 3287 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 86% | 57,261 psi | 90% | 3284 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,130 psi | 88% | 3268 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,014 psi | 88% | 3189 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,739 psi | 89% | 3422 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 59% | 2169 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,725 psi | 90% | 3258 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,435 psi | 90% | 3264 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 88% | 56,768 psi | 89% | 3340 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,651 psi | 87% | 3327 fps | 99.7% |
| Lovex S071 | <<locked>> | 92% | 56,724 psi | 89% | 3219 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 3353 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,998 psi | 86% | 3304 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,041 psi | 85% | 3294 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 90% | 56,898 psi | 89% | 3284 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,624 psi | 61% | 2218 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,664 psi | 84% | 3333 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,421 psi | 90% | 3366 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 56,173 psi | 88% | 3248 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 84% | 55,216 psi | 87% | 3264 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,824 psi | 86% | 3258 fps | 99.8% |
| Somchem S361 | <<locked>> | 82% | 54,012 psi | 85% | 3169 fps | 98.8% |
| Somchem S385 | <<locked>> | 84% | 55,463 psi | 87% | 3225 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,651 psi | 87% | 3212 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 54,766 psi | 86% | 3228 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,375 psi | 85% | 3304 fps | 99% |
| Vihtavuori N565 | <<locked>> | 90% | 55,709 psi | 87% | 3294 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 94% | 57,711 psi | 90% | 3369 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 54,824 psi | 86% | 3360 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,435 psi | 90% | 3346 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,332 psi | 87% | 3219 fps | 99.8% |
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% | 44,570 psi | 70% | 3002 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 46,572 psi | 73% | 3140 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 48,631 psi | 76% | 3150 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 43,845 psi | 69% | 3077 fps | 97.2% |
| ADI AR 2217 | <<locked>> | 84% | 37,594 psi | 59% | 2917 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 50,285 psi | 79% | 3287 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 30,095 psi | 47% | 2740 fps | 95.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,443 psi | 76% | 3140 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,643 psi | 70% | 3087 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,424 psi | 68% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,623 psi | 59% | 2949 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,559 psi | 78% | 3209 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 48,167 psi | 75% | 3199 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 52,011 psi | 82% | 3258 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 48,341 psi | 76% | 3114 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 41,597 psi | 65% | 3015 fps | 97.6% |
| Bofors RP30 | <<locked>> | 82% | 37,768 psi | 59% | 2933 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 44,643 psi | 70% | 3087 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 35,520 psi | 56% | 2864 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 80% | 46,514 psi | 73% | 3081 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,585 psi | 71% | 3064 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,359 psi | 82% | 3133 fps | 100% |
| Hodgdon Retumbo | 81.8 gr | 80% | 36,767 psi | 58% | 2986 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1946 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,157 psi | 85% | 3199 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,253 psi | 74% | 3071 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 42,656 psi | 67% | 3058 fps | 96.9% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,535 psi | 57% | 2913 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 38,334 psi | 60% | 2864 fps | 98.9% |
| Norma 217 | <<locked>> | 84% | 32,010 psi | 50% | 2805 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 47,674 psi | 75% | 3166 fps | 99.7% |
| Ramshot Grand | <<locked>> | 80% | 42,946 psi | 67% | 3074 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 80% | 38,827 psi | 61% | 2933 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,964 psi | 45% | 1991 fps | 100% |
| ReloadSwiss RS 76 | 87.5 gr | 80% | 36,216 psi | 57% | 2956 fps | 98% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,134 psi | 66% | 3058 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 49,298 psi | 77% | 3120 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 48,124 psi | 75% | 3130 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,776 psi | 75% | 3127 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 50,415 psi | 79% | 3104 fps | 98.2% |
| Somchem S385 | <<locked>> | 80% | 48,573 psi | 76% | 3104 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 80% | 42,424 psi | 66% | 2963 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 48,095 psi | 75% | 3114 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,239 psi | 74% | 3159 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 39,378 psi | 62% | 2953 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 86% | 42,989 psi | 67% | 3074 fps | 95.3% |
| Vihtavuori N570 | 97.6 gr | 92% | 50,981 psi | 80% | 3281 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,105 psi | 66% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,889 psi | 70% | 3025 fps | 98.6% |
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 57 powders for 7 mm KM Katzmaier loaded with the .284 | 130gr | Speer Hot-Cor. Hodgdon Retumbo delivers the highest muzzle velocity at 3,422 fps; across all powders the maximum-charge window runs from 2,169 fps to 3,422 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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 130.0 gr projectile in 0.284" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm KM Katzmaier with the .284 | 130gr | Speer Hot-Cor they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.