Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 130gr | Speer Boat-Tail bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and Alliant Reloder-33.
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>> | 88% | 57,653 psi | 90% | 3235 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,681 psi | 89% | 3343 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 54,824 psi | 86% | 3271 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 88% | 57,217 psi | 90% | 3343 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 96% | 56,159 psi | 88% | 3314 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3432 fps | 97.9% |
| ADI AR 2225 | <<locked>> | 98% | 55,317 psi | 87% | 3337 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,578 psi | 86% | 3255 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,682 psi | 90% | 3337 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,637 psi | 87% | 3241 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,289 psi | 88% | 3317 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,637 psi | 89% | 3333 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,723 psi | 86% | 3330 fps | 97.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,621 psi | 86% | 3314 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,114 psi | 85% | 3228 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 57,043 psi | 89% | 3327 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 56,217 psi | 88% | 3327 fps | 99.7% |
| Bofors RP5 | <<locked>> | 88% | 57,682 psi | 90% | 3337 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 53,795 psi | 84% | 3274 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 86% | 56,318 psi | 88% | 3271 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,187 psi | 86% | 3251 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,056 psi | 86% | 3179 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,405 psi | 87% | 3406 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2162 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,927 psi | 89% | 3245 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,725 psi | 90% | 3248 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,536 psi | 89% | 3248 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 88% | 55,550 psi | 87% | 3323 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,302 psi | 85% | 3307 fps | 99.5% |
| Lovex S071 | <<locked>> | 92% | 55,724 psi | 87% | 3205 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,463 psi | 87% | 3330 fps | 100% |
| Norma MRP | <<locked>> | 84% | 53,940 psi | 85% | 3287 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,927 psi | 89% | 3346 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 55,521 psi | 87% | 3264 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 2215 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,637 psi | 89% | 3389 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,883 psi | 88% | 3343 fps | 99% |
| Rottweil R 904 | <<locked>> | 84% | 55,405 psi | 87% | 3235 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 84% | 54,143 psi | 85% | 3248 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,551 psi | 90% | 3307 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 56,855 psi | 89% | 3219 fps | 99.1% |
| Somchem S365 | <<locked>> | 82% | 57,188 psi | 90% | 3241 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,650 psi | 86% | 3215 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,737 psi | 86% | 3199 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 57,580 psi | 90% | 3278 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,276 psi | 90% | 3356 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 54,592 psi | 86% | 3278 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 94% | 56,405 psi | 88% | 3353 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 96% | 57,595 psi | 90% | 3415 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,956 psi | 88% | 3333 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,433 psi | 85% | 3209 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% | 43,888 psi | 69% | 2992 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 45,643 psi | 72% | 3123 fps | 96.5% |
| ADI AR 2209 | <<locked>> | 80% | 47,776 psi | 75% | 3136 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 43,033 psi | 67% | 3064 fps | 96.9% |
| ADI AR 2217 | <<locked>> | 84% | 36,796 psi | 58% | 2900 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 96% | 49,081 psi | 77% | 3264 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 31,589 psi | 50% | 2789 fps | 96% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,776 psi | 75% | 3130 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,816 psi | 69% | 3071 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,511 psi | 67% | 3009 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,811 psi | 58% | 2933 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,646 psi | 76% | 3196 fps | 100% |
| Alliant Reloder-33 | 99.9 gr | 92% | 46,978 psi | 74% | 3179 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 98% | 50,662 psi | 79% | 3238 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 47,442 psi | 74% | 3094 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 40,785 psi | 64% | 2999 fps | 97.3% |
| Bofors RP30 | <<locked>> | 82% | 36,999 psi | 58% | 2917 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 43,816 psi | 69% | 3071 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 82% | 37,536 psi | 59% | 2923 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 80% | 45,585 psi | 71% | 3064 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,817 psi | 70% | 3048 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,430 psi | 81% | 3120 fps | 100% |
| Hodgdon Retumbo | 80.5 gr | 80% | 35,998 psi | 56% | 2966 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 44% | 1942 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,359 psi | 84% | 3186 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 54,041 psi | 85% | 3189 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,557 psi | 73% | 3061 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 80% | 41,814 psi | 66% | 3045 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 90% | 38,319 psi | 60% | 2966 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 37,652 psi | 59% | 2851 fps | 98.7% |
| Norma 217 | <<locked>> | 86% | 33,533 psi | 53% | 2858 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 46,659 psi | 73% | 3153 fps | 99.6% |
| Ramshot Grand | <<locked>> | 80% | 41,901 psi | 66% | 3051 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 80% | 37,927 psi | 59% | 2913 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,964 psi | 45% | 1988 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,418 psi | 56% | 2936 fps | 97.7% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 41,104 psi | 64% | 3038 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 48,501 psi | 76% | 3107 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 47,253 psi | 74% | 3114 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,905 psi | 74% | 3110 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 49,748 psi | 78% | 3094 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 53,403 psi | 84% | 3182 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,776 psi | 75% | 3091 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 80% | 41,800 psi | 66% | 2949 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 47,181 psi | 74% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,282 psi | 73% | 3143 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 80% | 38,479 psi | 60% | 2933 fps | 95% |
| Vihtavuori N568 | <<locked>> | 88% | 45,281 psi | 71% | 3133 fps | 96.1% |
| Vihtavuori N570 | 96.1 gr | 92% | 49,864 psi | 78% | 3264 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,075 psi | 64% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,121 psi | 69% | 3012 fps | 98.3% |
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 59 powders for 7 mm KM Katzmaier loaded with the .284 | 130gr | Speer Boat-Tail. ADI AR 2218 delivers the highest muzzle velocity at 3,432 fps; across all powders the maximum-charge window runs from 2,162 fps to 3,432 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 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, ADI AR 2218, Alliant Reloder-50 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, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 130gr | Speer Boat-Tail 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.