Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 145gr | Speer Grand Slam 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% | 55,042 psi | 86% | 3058 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 3074 fps | 96.8% |
| Accurate MAGPRO | <<locked>> | 82% | 54,085 psi | 85% | 3163 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 82% | 55,753 psi | 87% | 3146 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,636 psi | 86% | 3163 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 92% | 54,172 psi | 85% | 3143 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 96% | 54,853 psi | 86% | 3268 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 96% | 57,653 psi | 90% | 3225 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,317 psi | 87% | 3133 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,201 psi | 87% | 3156 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,232 psi | 90% | 3117 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,230 psi | 85% | 3136 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,000 psi | 89% | 3241 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,101 psi | 89% | 3232 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,940 psi | 86% | 3117 fps | 98.3% |
| Bofors RP15 | <<locked>> | 86% | 54,650 psi | 86% | 3146 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,172 psi | 85% | 3156 fps | 99.9% |
| Bofors RP5 | <<locked>> | 84% | 55,201 psi | 87% | 3156 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,361 psi | 87% | 3159 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,000 psi | 89% | 3150 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,043 psi | 88% | 3136 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,711 psi | 90% | 3294 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,884 psi | 59% | 2067 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,101 psi | 89% | 3127 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 57,116 psi | 90% | 3209 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,623 psi | 89% | 3209 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 57,058 psi | 89% | 3087 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,215 psi | 85% | 3169 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,216 psi | 87% | 3169 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,462 psi | 85% | 3166 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 57,334 psi | 90% | 3156 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,972 psi | 61% | 2116 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,592 psi | 86% | 3209 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 53,925 psi | 85% | 3173 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 82% | 56,086 psi | 88% | 3114 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 82% | 55,216 psi | 87% | 3127 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,736 psi | 83% | 3087 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,853 psi | 86% | 3123 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,551 psi | 90% | 3100 fps | 99.7% |
| Somchem S385 | <<locked>> | 82% | 55,448 psi | 87% | 3091 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,724 psi | 87% | 3081 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,201 psi | 87% | 3104 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 82% | 55,187 psi | 86% | 3094 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,563 psi | 86% | 3169 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 88% | 56,115 psi | 88% | 3169 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 90% | 54,259 psi | 85% | 3179 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 92% | 55,738 psi | 87% | 3248 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,259 psi | 85% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,332 psi | 87% | 3087 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% | 47,993 psi | 75% | 2940 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 47,181 psi | 74% | 3002 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 50,285 psi | 79% | 3091 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 52,112 psi | 82% | 3084 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 47,427 psi | 74% | 3025 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 35,331 psi | 55% | 2746 fps | 96% |
| ADI AR 2218 | 97.1 gr | 90% | 43,758 psi | 69% | 3025 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 32,808 psi | 51% | 2717 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,851 psi | 81% | 3074 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,196 psi | 76% | 3028 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,949 psi | 74% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,089 psi | 64% | 2897 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 45,397 psi | 71% | 3018 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 92% | 45,672 psi | 72% | 3012 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,063 psi | 71% | 2923 fps | 96% |
| Bofors RP15 | <<locked>> | 80% | 44,759 psi | 70% | 2959 fps | 99.1% |
| Bofors RP30 | <<locked>> | 80% | 38,363 psi | 60% | 2828 fps | 97.1% |
| Bofors RP5 | <<locked>> | 80% | 48,196 psi | 76% | 3028 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 38,551 psi | 60% | 2831 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 80% | 49,748 psi | 78% | 3022 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,892 psi | 77% | 3005 fps | 98.7% |
| Hodgdon Retumbo | 81.5 gr | 80% | 40,219 psi | 63% | 2956 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 45% | 1854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,285 psi | 79% | 3005 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 46,267 psi | 73% | 3012 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,925 psi | 55% | 2753 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 41,365 psi | 65% | 2812 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 30,690 psi | 48% | 2651 fps | 96% |
| Norma MRP | <<locked>> | 80% | 51,488 psi | 81% | 3107 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,833 psi | 73% | 3028 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 80% | 42,337 psi | 66% | 2887 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,240 psi | 46% | 1896 fps | 100% |
| ReloadSwiss RS 76 | 87.2 gr | 80% | 39,885 psi | 63% | 2930 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 39,711 psi | 62% | 2881 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 52,547 psi | 82% | 3054 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 51,648 psi | 81% | 3064 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 49,124 psi | 77% | 3018 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,300 psi | 80% | 3061 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 53,722 psi | 84% | 3038 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 51,982 psi | 81% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 45,600 psi | 71% | 2904 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 86% | 48,196 psi | 76% | 2972 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 51,634 psi | 81% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,894 psi | 80% | 3104 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 42,641 psi | 67% | 2907 fps | 97.6% |
| Vihtavuori N568 | <<locked>> | 82% | 40,611 psi | 64% | 2897 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 86% | 44,831 psi | 70% | 3028 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,688 psi | 73% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,225 psi | 76% | 2966 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 56 powders for 7 mm KM Katzmaier loaded with the .284 | 145gr | Speer Grand Slam. Hodgdon Retumbo delivers the highest muzzle velocity at 3,294 fps; across all powders the maximum-charge window runs from 2,067 fps to 3,294 fps. Accurate 8700 gives the best case fill at 100 %, and 56 of the 56 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 145.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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 | 145gr | Speer Grand Slam they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT 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.