Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 120gr | Barnes TTSX BT bullet and 63 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N568 and Winchester StaBALL HD.
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>> | 90% | 56,623 psi | 89% | 3320 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,797 psi | 89% | 3356 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,811 psi | 87% | 3425 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 86% | 54,375 psi | 85% | 3363 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 90% | 56,782 psi | 89% | 3438 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 98% | 55,288 psi | 87% | 3396 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3412 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,433 psi | 85% | 3363 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,056 psi | 85% | 3350 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,014 psi | 89% | 3428 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,882 psi | 86% | 3337 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,129 psi | 86% | 3402 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,593 psi | 87% | 3422 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,070 psi | 85% | 3317 fps | 96.4% |
| Bofors RP15 | <<locked>> | 92% | 56,188 psi | 88% | 3412 fps | 99.6% |
| Bofors RP30 | <<locked>> | 96% | 54,911 psi | 86% | 3402 fps | 99.2% |
| Bofors RP5 | <<locked>> | 90% | 57,014 psi | 89% | 3428 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 96% | 56,927 psi | 89% | 3425 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 88% | 55,869 psi | 88% | 3360 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,911 psi | 86% | 3343 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,607 psi | 86% | 3278 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 53,983 psi | 85% | 3484 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,347 psi | 59% | 2234 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,956 psi | 89% | 3346 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 57,348 psi | 90% | 3346 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,347 psi | 88% | 3340 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 90% | 54,897 psi | 86% | 3412 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,037 psi | 77% | 3301 fps | 98.2% |
| Lovex S065 | <<locked>> | 82% | 56,753 psi | 89% | 3320 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,187 psi | 86% | 3317 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,505 psi | 85% | 3287 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,433 psi | 85% | 3340 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 49,951 psi | 78% | 3330 fps | 99.7% |
| Norma MRP | <<locked>> | 88% | 57,101 psi | 89% | 3445 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,085 psi | 86% | 3337 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,014 psi | 88% | 3432 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 82% | 54,317 psi | 85% | 3340 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,723 psi | 86% | 3350 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,145 psi | 60% | 2283 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,276 psi | 90% | 3379 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,217 psi | 88% | 3412 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,114 psi | 86% | 3471 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,592 psi | 86% | 3415 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 86% | 55,158 psi | 86% | 3330 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 88% | 57,363 psi | 90% | 3402 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,753 psi | 89% | 3320 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,187 psi | 86% | 3317 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,912 psi | 88% | 3268 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,956 psi | 89% | 3399 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 56,826 psi | 89% | 3314 fps | 98.6% |
| Somchem S365 | <<locked>> | 84% | 56,550 psi | 89% | 3343 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 53,954 psi | 85% | 3301 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 82% | 56,739 psi | 89% | 3327 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,070 psi | 85% | 3284 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 82% | 56,072 psi | 88% | 3330 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,507 psi | 89% | 3366 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,608 psi | 89% | 3445 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 94% | 57,508 psi | 90% | 3425 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 96% | 55,158 psi | 86% | 3422 fps | 97.8% |
| Vihtavuori N570 | <<locked>> | 98% | 56,463 psi | 88% | 3488 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,550 psi | 89% | 3268 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,317 psi | 85% | 3415 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,027 psi | 85% | 3297 fps | 99.4% |
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% | 39,726 psi | 62% | 2995 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 52,881 psi | 83% | 3291 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 44,773 psi | 70% | 3199 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 44,164 psi | 69% | 3153 fps | 97.5% |
| ADI AR 2213 | <<locked>> | 82% | 42,424 psi | 66% | 3140 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 41,466 psi | 65% | 3107 fps | 96% |
| ADI AR 2225 | <<locked>> | 86% | 32,750 psi | 51% | 2907 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,691 psi | 79% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,063 psi | 69% | 3143 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,030 psi | 63% | 3074 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,638 psi | 61% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,286 psi | 52% | 2920 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,743 psi | 69% | 3196 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,633 psi | 79% | 3251 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 37,028 psi | 58% | 2995 fps | 95.1% |
| Bofors RP30 | <<locked>> | 88% | 41,205 psi | 65% | 3114 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 40,030 psi | 63% | 3074 fps | 96.4% |
| Hodgdon H1000 | <<locked>> | 86% | 39,508 psi | 62% | 3058 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 80% | 42,061 psi | 66% | 3074 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 82% | 44,367 psi | 70% | 3130 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,587 psi | 75% | 3159 fps | 100% |
| Hodgdon Retumbo | 84.4 gr | 84% | 37,550 psi | 59% | 3100 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 44% | 2008 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,879 psi | 78% | 3219 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 50,024 psi | 78% | 3225 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,381 psi | 68% | 3077 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 82% | 41,031 psi | 64% | 3117 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,581 psi | 62% | 3087 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 53,287 psi | 84% | 3264 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,648 psi | 81% | 3251 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,968 psi | 53% | 2848 fps | 96.8% |
| Norma 204 | <<locked>> | 80% | 50,633 psi | 79% | 3268 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 34,316 psi | 54% | 2966 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 42,467 psi | 67% | 3153 fps | 98.3% |
| Norma URP | <<locked>> | 80% | 51,445 psi | 81% | 3271 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 41,031 psi | 64% | 3123 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 50,633 psi | 79% | 3271 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,924 psi | 53% | 2897 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,485 psi | 45% | 2054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,301 psi | 84% | 3314 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,996 psi | 81% | 3340 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 34,287 psi | 54% | 2982 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 46,543 psi | 73% | 3251 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 80% | 45,107 psi | 71% | 3130 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 43,482 psi | 68% | 3127 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,287 psi | 84% | 3264 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,648 psi | 81% | 3251 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,301 psi | 82% | 3205 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,149 psi | 68% | 3123 fps | 97.4% |
| Somchem S361 | <<locked>> | 80% | 46,137 psi | 72% | 3110 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 49,095 psi | 77% | 3222 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,961 psi | 69% | 3104 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 80% | 52,982 psi | 83% | 3268 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,203 psi | 60% | 2956 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 52,460 psi | 82% | 3271 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,989 psi | 67% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,308 psi | 66% | 3146 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 43,062 psi | 67% | 3133 fps | 95.8% |
| Vihtavuori N568 | 96.4 gr | 92% | 47,427 psi | 74% | 3268 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 52,301 psi | 82% | 3406 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,736 psi | 83% | 3212 fps | 100% |
| Winchester StaBALL HD | 82.5 gr | 80% | 36,114 psi | 57% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,393 psi | 63% | 3015 fps | 96.6% |
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 70 powders for 7 mm KM Katzmaier loaded with the .284 | 120gr | Barnes TTSX BT. Vihtavuori N570 delivers the highest muzzle velocity at 3,488 fps; across all powders the maximum-charge window runs from 2,234 fps to 3,488 fps. ADI AR 2218 gives the best case fill at 100 %, and 70 of the 70 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 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, 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 N568, Winchester StaBALL HD rank at the top here: for 7 mm KM Katzmaier with the .284 | 120gr | Barnes TTSX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, 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.