Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 127gr | Geco ZERO LG bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, IMR 7828 SSC 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% | 57,101 psi | 89% | 3261 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,261 psi | 90% | 3291 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,260 psi | 88% | 3366 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 86% | 54,810 psi | 86% | 3301 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 90% | 57,130 psi | 90% | 3373 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 98% | 55,738 psi | 87% | 3337 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,302 psi | 85% | 3356 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,100 psi | 86% | 3297 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,795 psi | 86% | 3297 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 54,505 psi | 85% | 3287 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,363 psi | 90% | 3366 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,288 psi | 87% | 3271 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,593 psi | 87% | 3343 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,057 psi | 88% | 3360 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 53,708 psi | 84% | 3343 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 54,346 psi | 85% | 3258 fps | 96.9% |
| Bofors RP15 | <<locked>> | 92% | 56,739 psi | 89% | 3353 fps | 99.8% |
| Bofors RP30 | <<locked>> | 96% | 55,303 psi | 87% | 3343 fps | 99.5% |
| Bofors RP5 | <<locked>> | 90% | 57,363 psi | 90% | 3366 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 57,363 psi | 90% | 3366 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 56,289 psi | 88% | 3301 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,317 psi | 87% | 3284 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,027 psi | 86% | 3212 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,563 psi | 86% | 3425 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 2172 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,246 psi | 90% | 3281 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,682 psi | 90% | 3281 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,840 psi | 89% | 3284 fps | 99% |
| IMR 7828 SSC | <<locked>> | 90% | 55,419 psi | 87% | 3353 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,516 psi | 78% | 3248 fps | 98.6% |
| Lovex S065 | <<locked>> | 82% | 57,276 psi | 90% | 3258 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,593 psi | 87% | 3251 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,926 psi | 86% | 3225 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,810 psi | 86% | 3278 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 50,285 psi | 79% | 3278 fps | 99.8% |
| Norma MRP | <<locked>> | 88% | 57,682 psi | 90% | 3389 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,535 psi | 87% | 3271 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,536 psi | 89% | 3373 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 82% | 54,723 psi | 86% | 3274 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,201 psi | 87% | 3294 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,261 psi | 60% | 2221 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,579 psi | 89% | 3346 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,622 psi | 87% | 3412 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,998 psi | 86% | 3360 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 86% | 55,535 psi | 87% | 3268 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 86% | 54,128 psi | 85% | 3278 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,276 psi | 90% | 3258 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,593 psi | 87% | 3251 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,304 psi | 88% | 3202 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,508 psi | 90% | 3337 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 57,159 psi | 90% | 3251 fps | 98.9% |
| Somchem S365 | <<locked>> | 84% | 56,956 psi | 89% | 3274 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 54,433 psi | 85% | 3245 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 57,203 psi | 90% | 3264 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 54,534 psi | 85% | 3225 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 82% | 56,391 psi | 88% | 3264 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,058 psi | 89% | 3304 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,188 psi | 90% | 3386 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 92% | 53,983 psi | 85% | 3297 fps | 98.8% |
| Vihtavuori N568 | <<locked>> | 96% | 55,579 psi | 87% | 3369 fps | 98.2% |
| Vihtavuori N570 | <<locked>> | 98% | 56,811 psi | 89% | 3432 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,087 psi | 89% | 3205 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,882 psi | 86% | 3356 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,491 psi | 85% | 3238 fps | 99.6% |
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% | 40,190 psi | 63% | 2943 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 53,447 psi | 84% | 3232 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 45,092 psi | 71% | 3143 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 44,469 psi | 70% | 3097 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 39,813 psi | 62% | 3015 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 38,986 psi | 61% | 2982 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 84% | 30,806 psi | 48% | 2792 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,976 psi | 70% | 3097 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,169 psi | 80% | 3238 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,527 psi | 70% | 3087 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,379 psi | 63% | 3022 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,073 psi | 61% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,591 psi | 53% | 2874 fps | 98% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,251 psi | 69% | 3146 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,647 psi | 78% | 3264 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,630 psi | 75% | 3123 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 37,463 psi | 59% | 2946 fps | 95.8% |
| Bofors RP30 | <<locked>> | 86% | 38,725 psi | 61% | 2995 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,379 psi | 63% | 3022 fps | 97% |
| Hodgdon H1000 | <<locked>> | 84% | 36,941 psi | 58% | 2933 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 42,438 psi | 67% | 3025 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,669 psi | 65% | 3005 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,008 psi | 75% | 3097 fps | 100% |
| Hodgdon Retumbo | 80.1 gr | 82% | 35,215 psi | 55% | 2972 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,949 psi | 44% | 1949 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,183 psi | 79% | 3156 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 50,517 psi | 79% | 3166 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,627 psi | 68% | 3022 fps | 96.3% |
| IMR 7828 SSC | 80.1 gr | 82% | 41,437 psi | 65% | 3064 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,929 psi | 63% | 3038 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 53,722 psi | 84% | 3199 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,098 psi | 82% | 3189 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 34,258 psi | 54% | 2795 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 51,068 psi | 80% | 3209 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 32,256 psi | 51% | 2851 fps | 95% |
| Norma MRP | <<locked>> | 80% | 42,830 psi | 67% | 3100 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 51,938 psi | 81% | 3212 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,363 psi | 60% | 2995 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 51,068 psi | 80% | 3212 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,389 psi | 54% | 2854 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,601 psi | 45% | 1995 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,460 psi | 82% | 3278 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,126 psi | 50% | 2864 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 43,323 psi | 68% | 3123 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 45,527 psi | 71% | 3074 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 43,947 psi | 69% | 3074 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,722 psi | 84% | 3199 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,098 psi | 82% | 3189 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,562 psi | 82% | 3140 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,598 psi | 68% | 3068 fps | 97.9% |
| Somchem S361 | <<locked>> | 80% | 46,470 psi | 73% | 3054 fps | 96.9% |
| Somchem S365 | <<locked>> | 80% | 49,472 psi | 78% | 3156 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,353 psi | 70% | 3051 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 80% | 53,534 psi | 84% | 3205 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,653 psi | 61% | 2907 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 80% | 52,881 psi | 83% | 3205 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,323 psi | 68% | 3058 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,641 psi | 67% | 3091 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 40,582 psi | 64% | 3018 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 90% | 44,425 psi | 70% | 3140 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 96% | 52,707 psi | 83% | 3356 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,156 psi | 83% | 3146 fps | 100% |
| Winchester StaBALL HD | 80.3 gr | 80% | 36,637 psi | 57% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,770 psi | 64% | 2966 fps | 97.1% |
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 64 powders for 7 mm KM Katzmaier loaded with the .284 | 127gr | Geco ZERO LG. Vihtavuori N570 delivers the highest muzzle velocity at 3,432 fps; across all powders the maximum-charge window runs from 2,172 fps to 3,432 fps. ADI AR 2225 gives the best case fill at 100 %, and 64 of the 64 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 127.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Hodgdon TrailBoss, IMR 8133 Enduron 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, IMR 7828 SSC, Winchester StaBALL HD rank at the top here: for 7 mm KM Katzmaier with the .284 | 127gr | Geco ZERO LG 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.