Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Barnes MRX BT bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ADI AR 2218.
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% | 55,172 psi | 86% | 3107 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,331 psi | 85% | 3215 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 56,463 psi | 88% | 3205 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,201 psi | 87% | 3219 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 54,259 psi | 85% | 3192 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 55,114 psi | 86% | 3314 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 98% | 57,682 psi | 90% | 3278 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,144 psi | 88% | 3196 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,608 psi | 87% | 3212 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,392 psi | 90% | 3173 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,433 psi | 85% | 3189 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,230 psi | 85% | 3196 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,942 psi | 89% | 3284 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3268 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,753 psi | 87% | 3176 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 55,013 psi | 86% | 3199 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 54,244 psi | 85% | 3205 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,608 psi | 87% | 3212 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,854 psi | 88% | 3219 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 53,983 psi | 85% | 3143 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,811 psi | 89% | 3192 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,608 psi | 89% | 3107 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 53,563 psi | 84% | 3278 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 59% | 2093 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,389 psi | 85% | 3123 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 88% | 57,508 psi | 90% | 3264 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3251 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 57,130 psi | 90% | 3140 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 3274 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,695 psi | 87% | 3225 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,781 psi | 86% | 3219 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 57,537 psi | 90% | 3209 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 61% | 2142 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,578 psi | 86% | 3261 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,867 psi | 84% | 3219 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 84% | 56,913 psi | 89% | 3173 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 55,753 psi | 87% | 3182 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,376 psi | 87% | 3179 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,549 psi | 85% | 3097 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,101 psi | 88% | 3150 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,289 psi | 88% | 3136 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,651 psi | 87% | 3156 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 55,288 psi | 87% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,100 psi | 86% | 3228 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 90% | 56,246 psi | 88% | 3222 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 54,375 psi | 85% | 3228 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 94% | 55,622 psi | 87% | 3291 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,201 psi | 85% | 3202 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,014 psi | 88% | 3146 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% | 44,643 psi | 70% | 2923 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 47,007 psi | 74% | 3071 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 49,168 psi | 77% | 3077 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 44,411 psi | 70% | 3012 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 35,331 psi | 55% | 2785 fps | 95.4% |
| ADI AR 2218 | 100.2 gr | 94% | 47,181 psi | 74% | 3146 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 30,139 psi | 47% | 2674 fps | 96.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,921 psi | 77% | 3064 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,063 psi | 71% | 3015 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,758 psi | 69% | 2946 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,971 psi | 60% | 2874 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,314 psi | 79% | 3133 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,092 psi | 71% | 3054 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,530 psi | 76% | 3114 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,629 psi | 72% | 2979 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 41,901 psi | 66% | 2940 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 35,244 psi | 55% | 2792 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 45,063 psi | 71% | 3015 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 35,795 psi | 56% | 2802 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 46,862 psi | 73% | 3012 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,050 psi | 72% | 2995 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,823 psi | 83% | 3051 fps | 100% |
| Hodgdon Retumbo | 80.5 gr | 80% | 37,086 psi | 58% | 2920 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,282 psi | 44% | 1880 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,688 psi | 75% | 2999 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 43,149 psi | 68% | 2989 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,796 psi | 58% | 2848 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 38,348 psi | 60% | 2789 fps | 99.3% |
| Norma 217 | <<locked>> | 84% | 32,227 psi | 51% | 2740 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 48,109 psi | 75% | 3091 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,439 psi | 68% | 3002 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 80% | 39,117 psi | 61% | 2861 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 45% | 1923 fps | 100% |
| ReloadSwiss RS 76 | 86.1 gr | 80% | 36,492 psi | 57% | 2887 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,262 psi | 62% | 2913 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,734 psi | 78% | 3048 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 48,559 psi | 76% | 3054 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,211 psi | 76% | 3051 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,981 psi | 80% | 3035 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 48,907 psi | 77% | 3025 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,728 psi | 67% | 2890 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 51,880 psi | 81% | 3087 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 48,370 psi | 76% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,703 psi | 75% | 3087 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 39,450 psi | 62% | 2877 fps | 96.2% |
| Vihtavuori N568 | <<locked>> | 84% | 40,379 psi | 63% | 2936 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 90% | 48,051 psi | 75% | 3143 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,757 psi | 67% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,324 psi | 71% | 2953 fps | 99.1% |
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 | 140gr | Barnes MRX BT. ADI AR 2218 delivers the highest muzzle velocity at 3,314 fps; across all powders the maximum-charge window runs from 2,093 fps to 3,314 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 140.0 gr projectile in 0.284" calls for a 1:11.5 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. Hodgdon Retumbo, ReloadSwiss RS 76, ADI AR 2218 rank at the top here: for 7 mm KM Katzmaier with the .284 | 140gr | Barnes MRX BT 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.