Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 120gr | Sierra Pro-Hunter bullet and 55 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 Ramshot Grand.
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% | 55,579 psi | 87% | 3297 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,563 psi | 86% | 3396 fps | 98% |
| ADI AR 2209 | <<locked>> | 86% | 56,681 psi | 89% | 3399 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 88% | 55,187 psi | 86% | 3402 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 96% | 54,056 psi | 85% | 3366 fps | 99.2% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,839 psi | 86% | 3468 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3455 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,521 psi | 89% | 3396 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,159 psi | 88% | 3383 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,680 psi | 87% | 3399 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,290 psi | 90% | 3366 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 53,838 psi | 84% | 3376 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,128 psi | 85% | 3389 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,521 psi | 89% | 3455 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,086 psi | 88% | 3350 fps | 97% |
| Bofors RP15 | <<locked>> | 90% | 54,882 psi | 86% | 3386 fps | 99.5% |
| Bofors RP30 | <<locked>> | 96% | 57,682 psi | 90% | 3445 fps | 99.6% |
| Bofors RP5 | <<locked>> | 88% | 55,680 psi | 87% | 3399 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 94% | 55,448 psi | 87% | 3392 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 86% | 54,360 psi | 85% | 3330 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,145 psi | 90% | 3379 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,724 psi | 89% | 3304 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,826 psi | 89% | 3527 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 59% | 2244 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,143 psi | 86% | 3310 fps | 99.9% |
| IMR 4831 | <<locked>> | 82% | 55,767 psi | 87% | 3317 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,853 psi | 86% | 3310 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 90% | 57,377 psi | 90% | 3448 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,996 psi | 81% | 3353 fps | 98.8% |
| Lovex S070 | <<locked>> | 82% | 57,450 psi | 90% | 3350 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,261 psi | 90% | 3327 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,507 psi | 89% | 3373 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 52,939 psi | 83% | 3379 fps | 99.9% |
| Norma MRP | <<locked>> | 86% | 55,608 psi | 87% | 3415 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,421 psi | 90% | 3369 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 54,549 psi | 85% | 3399 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 82% | 56,507 psi | 89% | 3373 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,508 psi | 90% | 3392 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 60% | 2293 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,969 psi | 85% | 3442 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 53,519 psi | 84% | 3389 fps | 98.1% |
| Rottweil R 904 | <<locked>> | 86% | 57,159 psi | 90% | 3363 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 86% | 55,985 psi | 88% | 3376 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 82% | 57,450 psi | 90% | 3350 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,579 psi | 87% | 3369 fps | 99.6% |
| Somchem S361 | <<locked>> | 84% | 55,187 psi | 86% | 3284 fps | 98.5% |
| Somchem S365 | <<locked>> | 82% | 55,042 psi | 86% | 3314 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,391 psi | 88% | 3337 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 90% | 56,362 psi | 88% | 3320 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 86% | 55,347 psi | 87% | 3340 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,056 psi | 86% | 3409 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 92% | 56,260 psi | 88% | 3399 fps | 99% |
| Vihtavuori N568 | <<locked>> | 94% | 54,056 psi | 85% | 3399 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,638 psi | 90% | 3461 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,347 psi | 88% | 3333 fps | 99.7% |
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% | 42,061 psi | 66% | 3041 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 43,801 psi | 69% | 3169 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 46,079 psi | 72% | 3192 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 80% | 41,336 psi | 65% | 3110 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 88% | 40,669 psi | 64% | 3077 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 98% | 50,763 psi | 80% | 3379 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 84% | 32,430 psi | 51% | 2890 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,823 psi | 83% | 3333 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,963 psi | 72% | 3179 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,076 psi | 66% | 3120 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,828 psi | 64% | 3071 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,244 psi | 55% | 2972 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,325 psi | 73% | 3245 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 52,330 psi | 82% | 3373 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 49,110 psi | 77% | 3212 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 39,189 psi | 61% | 3045 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 40,611 psi | 64% | 3094 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 42,076 psi | 66% | 3120 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 84% | 38,566 psi | 60% | 3028 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 44,077 psi | 69% | 3117 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,192 psi | 68% | 3097 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,705 psi | 78% | 3192 fps | 100% |
| Hodgdon Retumbo | 83.8 gr | 82% | 36,898 psi | 58% | 3074 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 44% | 2014 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,706 psi | 81% | 3251 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 52,199 psi | 82% | 3258 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,063 psi | 71% | 3114 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,089 psi | 63% | 3087 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 92% | 39,160 psi | 61% | 3071 fps | 95.2% |
| Lovex S070 | <<locked>> | 80% | 53,867 psi | 84% | 3287 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 36,114 psi | 57% | 2897 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 52,736 psi | 83% | 3304 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 34,272 psi | 54% | 2956 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 44,802 psi | 70% | 3202 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 53,737 psi | 84% | 3310 fps | 100% |
| Ramshot Grand | 84.2 gr | 80% | 40,132 psi | 63% | 3094 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 52,779 psi | 83% | 3307 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,216 psi | 57% | 2953 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 45% | 2060 fps | 100% |
| ReloadSwiss RS 76 | 87.5 gr | 80% | 33,794 psi | 53% | 2963 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 45,774 psi | 72% | 3228 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 46,934 psi | 74% | 3166 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 45,542 psi | 71% | 3169 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 80% | 53,867 psi | 84% | 3287 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,208 psi | 71% | 3166 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 48,037 psi | 75% | 3146 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 51,401 psi | 81% | 3251 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,064 psi | 72% | 3143 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 80% | 40,132 psi | 63% | 2995 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 80% | 45,368 psi | 71% | 3159 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,498 psi | 70% | 3192 fps | 96% |
| Vihtavuori N565 | <<locked>> | 84% | 42,482 psi | 67% | 3114 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 90% | 46,572 psi | 73% | 3245 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,798 psi | 61% | 3110 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,482 psi | 67% | 3061 fps | 97.3% |
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 55 powders for 7 mm KM Katzmaier loaded with the .284 | 120gr | Sierra Pro-Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,527 fps; across all powders the maximum-charge window runs from 2,244 fps to 3,527 fps. ADI AR 2218 gives the best case fill at 100 %, and 55 of the 55 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 1:16.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, 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, Ramshot Grand rank at the top here: for 7 mm KM Katzmaier with the .284 | 120gr | Sierra Pro-Hunter they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.