Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 135gr | Atomic 29 HP bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo 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% | 54,969 psi | 86% | 3146 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,012 psi | 85% | 3248 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 55,840 psi | 88% | 3238 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 54,549 psi | 85% | 3248 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 96% | 57,537 psi | 90% | 3287 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 54,288 psi | 85% | 3333 fps | 97.6% |
| ADI AR 2225 | <<locked>> | 98% | 56,840 psi | 89% | 3310 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,579 psi | 87% | 3225 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,085 psi | 86% | 3245 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,043 psi | 89% | 3209 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,696 psi | 90% | 3287 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,737 psi | 84% | 3235 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,275 psi | 88% | 3314 fps | 97.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,275 psi | 88% | 3301 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,317 psi | 87% | 3202 fps | 97.8% |
| Bofors RP15 | <<locked>> | 88% | 54,505 psi | 85% | 3235 fps | 99.8% |
| Bofors RP30 | <<locked>> | 94% | 57,580 psi | 90% | 3304 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 55,085 psi | 86% | 3245 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 55,114 psi | 86% | 3248 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 57,377 psi | 90% | 3241 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,231 psi | 88% | 3222 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,057 psi | 88% | 3143 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,942 psi | 89% | 3383 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 59% | 2126 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,479 psi | 90% | 3219 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 56,971 psi | 89% | 3297 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3284 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,884 psi | 89% | 3176 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3310 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,143 psi | 86% | 3261 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,244 psi | 85% | 3251 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 90% | 57,130 psi | 90% | 3241 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 61% | 2172 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,780 psi | 84% | 3294 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,493 psi | 90% | 3323 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 84% | 56,347 psi | 88% | 3205 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 55,405 psi | 87% | 3219 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,027 psi | 86% | 3215 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 54,114 psi | 85% | 3127 fps | 99% |
| Somchem S385 | <<locked>> | 84% | 55,695 psi | 87% | 3182 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,796 psi | 87% | 3169 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,288 psi | 87% | 3186 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 55,114 psi | 86% | 3189 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,549 psi | 85% | 3258 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 90% | 55,854 psi | 88% | 3255 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 57,682 psi | 90% | 3327 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 54,969 psi | 86% | 3320 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,624 psi | 90% | 3304 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,680 psi | 87% | 3179 fps | 99.9% |
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% | 44,788 psi | 70% | 2966 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 46,659 psi | 73% | 3104 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 48,863 psi | 77% | 3110 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 44,092 psi | 69% | 3045 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 84% | 37,753 psi | 59% | 2884 fps | 96% |
| ADI AR 2218 | <<locked>> | 94% | 46,775 psi | 73% | 3169 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 30,284 psi | 47% | 2710 fps | 95.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,689 psi | 76% | 3100 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,918 psi | 70% | 3051 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,613 psi | 68% | 2986 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,855 psi | 59% | 2913 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,879 psi | 78% | 3169 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 48,167 psi | 75% | 3159 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,312 psi | 76% | 3150 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,382 psi | 71% | 3009 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 41,800 psi | 66% | 2976 fps | 97.9% |
| Bofors RP30 | <<locked>> | 80% | 35,317 psi | 55% | 2831 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 44,918 psi | 70% | 3051 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 35,737 psi | 56% | 2835 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 46,615 psi | 73% | 3045 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,832 psi | 72% | 3028 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,562 psi | 82% | 3091 fps | 100% |
| Hodgdon Retumbo | 80.2 gr | 80% | 36,999 psi | 58% | 2956 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1909 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,456 psi | 74% | 3031 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 42,888 psi | 67% | 3025 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,782 psi | 58% | 2884 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 38,580 psi | 60% | 2831 fps | 99.1% |
| Norma 217 | <<locked>> | 84% | 32,198 psi | 50% | 2776 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 47,892 psi | 75% | 3127 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 43,120 psi | 68% | 3035 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 80% | 38,885 psi | 61% | 2897 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,080 psi | 46% | 1952 fps | 100% |
| ReloadSwiss RS 76 | 85.8 gr | 80% | 36,477 psi | 57% | 2927 fps | 98.4% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 42,279 psi | 66% | 3025 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,487 psi | 78% | 3081 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 48,327 psi | 76% | 3087 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,979 psi | 75% | 3084 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 50,647 psi | 79% | 3068 fps | 98.5% |
| Somchem S385 | <<locked>> | 80% | 48,820 psi | 77% | 3064 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 42,641 psi | 67% | 2927 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 90% | 51,590 psi | 81% | 3117 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 48,298 psi | 76% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,427 psi | 74% | 3120 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 39,537 psi | 62% | 2917 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 43,192 psi | 68% | 3041 fps | 95.8% |
| Vihtavuori N570 | 93.6 gr | 90% | 47,572 psi | 75% | 3169 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,308 psi | 66% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,005 psi | 71% | 2986 fps | 98.8% |
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 | 135gr | Atomic 29 HP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,383 fps; across all powders the maximum-charge window runs from 2,126 fps to 3,383 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 135.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm KM Katzmaier with the .284 | 135gr | Atomic 29 HP 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.