Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 120gr | Barnes X 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, Alliant Reloder-33 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% | 55,230 psi | 87% | 3284 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 56,101 psi | 88% | 3435 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 86% | 57,188 psi | 90% | 3442 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 84% | 55,027 psi | 86% | 3360 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 88% | 57,276 psi | 90% | 3435 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 96% | 56,188 psi | 88% | 3402 fps | 99.4% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3510 fps | 97.1% |
| ADI AR 2225 | <<locked>> | 98% | 55,434 psi | 87% | 3428 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,926 psi | 86% | 3353 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,491 psi | 85% | 3373 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,173 psi | 88% | 3346 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,507 psi | 89% | 3415 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,276 psi | 90% | 3438 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,158 psi | 86% | 3425 fps | 96.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 3415 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,624 psi | 90% | 3373 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 57,493 psi | 90% | 3425 fps | 99.7% |
| Bofors RP30 | <<locked>> | 94% | 56,739 psi | 89% | 3425 fps | 99.4% |
| Bofors RP5 | <<locked>> | 86% | 54,491 psi | 85% | 3373 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 92% | 53,954 psi | 85% | 3363 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 86% | 56,376 psi | 88% | 3360 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,448 psi | 87% | 3340 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,608 psi | 87% | 3281 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,463 psi | 87% | 3504 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,797 psi | 59% | 2238 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,174 psi | 90% | 3337 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,739 psi | 89% | 3337 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 88% | 55,666 psi | 87% | 3412 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,911 psi | 86% | 3406 fps | 99.2% |
| Lovex S071 | <<locked>> | 92% | 57,014 psi | 89% | 3314 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 3435 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,476 psi | 85% | 3392 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 57,000 psi | 89% | 3438 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 90% | 55,970 psi | 88% | 3363 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,870 psi | 61% | 2290 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,710 psi | 89% | 3491 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,449 psi | 88% | 3442 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 84% | 55,695 psi | 87% | 3327 fps | 99% |
| Rottweil R 905 | <<locked>> | 84% | 54,737 psi | 86% | 3343 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,346 psi | 85% | 3340 fps | 99.5% |
| Somchem S361 | <<locked>> | 84% | 57,276 psi | 90% | 3310 fps | 98.7% |
| Somchem S385 | <<locked>> | 84% | 55,477 psi | 87% | 3314 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 88% | 55,230 psi | 87% | 3294 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 84% | 54,926 psi | 86% | 3327 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,580 psi | 90% | 3451 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 90% | 55,463 psi | 87% | 3379 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 94% | 56,826 psi | 89% | 3445 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,333 psi | 88% | 3442 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,882 psi | 86% | 3297 fps | 99.5% |
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% | 45,426 psi | 71% | 3104 fps | 99.6% |
| Accurate High Country | <<locked>> | 80% | 48,965 psi | 77% | 3297 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 80% | 46,514 psi | 73% | 3225 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 48,269 psi | 76% | 3232 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 43,642 psi | 68% | 3156 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 40,379 psi | 63% | 3068 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 98% | 53,359 psi | 84% | 3428 fps | 96% |
| ADI AR 2225 | <<locked>> | 82% | 32,909 psi | 52% | 2904 fps | 95.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,225 psi | 76% | 3222 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,701 psi | 70% | 3176 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,468 psi | 68% | 3120 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,884 psi | 59% | 3041 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,530 psi | 78% | 3307 fps | 100% |
| Alliant Reloder-33 | 102 gr | 94% | 51,213 psi | 80% | 3350 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 51,851 psi | 81% | 3343 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 50,850 psi | 80% | 3245 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 41,814 psi | 66% | 3104 fps | 97% |
| Bofors RP30 | <<locked>> | 82% | 38,130 psi | 60% | 3028 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 44,701 psi | 70% | 3176 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 82% | 38,493 psi | 60% | 3022 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 46,224 psi | 72% | 3159 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,469 psi | 71% | 3143 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,083 psi | 82% | 3225 fps | 100% |
| Hodgdon Retumbo | 80.5 gr | 80% | 37,043 psi | 58% | 3074 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 45% | 2014 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,751 psi | 84% | 3278 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,094 psi | 74% | 3150 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 42,496 psi | 67% | 3140 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 90% | 39,479 psi | 62% | 3074 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 39,523 psi | 62% | 2972 fps | 98.6% |
| Norma 217 | <<locked>> | 86% | 35,012 psi | 55% | 2979 fps | 96% |
| Norma MRP | <<locked>> | 80% | 47,485 psi | 74% | 3258 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 42,670 psi | 67% | 3150 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 80% | 39,001 psi | 61% | 3022 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,240 psi | 46% | 2060 fps | 100% |
| ReloadSwiss RS 76 | 86.1 gr | 80% | 36,651 psi | 57% | 3048 fps | 97.4% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 45,339 psi | 71% | 3219 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 49,037 psi | 77% | 3199 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 48,037 psi | 75% | 3215 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,688 psi | 75% | 3209 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 50,430 psi | 79% | 3186 fps | 97.5% |
| Somchem S385 | <<locked>> | 80% | 48,776 psi | 76% | 3192 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 80% | 42,627 psi | 67% | 3048 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 48,472 psi | 76% | 3212 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,963 psi | 74% | 3241 fps | 96.8% |
| Vihtavuori N565 | <<locked>> | 82% | 42,699 psi | 67% | 3117 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 88% | 46,137 psi | 72% | 3232 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,989 psi | 66% | 3186 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,005 psi | 71% | 3110 fps | 98% |
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 | 120gr | Barnes X BT. ADI AR 2218 delivers the highest muzzle velocity at 3,510 fps; across all powders the maximum-charge window runs from 2,238 fps to 3,510 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 120.0 gr projectile in 0.284" calls for a 1:11.5 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, Alliant Reloder-33, ReloadSwiss RS 76 rank at the top here: for 7 mm KM Katzmaier with the .284 | 120gr | Barnes X BT 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.