Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 145gr | Peregrine Glider GRM bullet and 51 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% | 54,027 psi | 85% | 3048 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 57,188 psi | 90% | 3222 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 55,564 psi | 87% | 3146 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,027 psi | 85% | 3156 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 56,927 psi | 89% | 3196 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 53,548 psi | 84% | 3245 fps | 98% |
| ADI AR 2225 | <<locked>> | 98% | 56,159 psi | 88% | 3215 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,651 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,071 psi | 86% | 3133 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,462 psi | 85% | 3153 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,347 psi | 88% | 3114 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,985 psi | 89% | 3192 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,276 psi | 90% | 3205 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,405 psi | 87% | 3225 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 3205 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,882 psi | 86% | 3120 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 57,580 psi | 90% | 3199 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,681 psi | 89% | 3205 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,462 psi | 85% | 3153 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,534 psi | 85% | 3156 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 56,927 psi | 89% | 3153 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,724 psi | 87% | 3130 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,608 psi | 87% | 3048 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,347 psi | 88% | 3287 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2047 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,638 psi | 90% | 3120 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,130 psi | 90% | 3127 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 56,347 psi | 88% | 3205 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,882 psi | 86% | 3192 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 55,970 psi | 88% | 3077 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 3212 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,520 psi | 85% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 53,606 psi | 84% | 3159 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 56,304 psi | 88% | 3150 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,537 psi | 60% | 2093 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,363 psi | 90% | 3268 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,565 psi | 89% | 3232 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 56,014 psi | 88% | 3117 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 54,781 psi | 86% | 3123 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,418 psi | 85% | 3120 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,464 psi | 90% | 3104 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 55,085 psi | 86% | 3091 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,274 psi | 87% | 3081 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,346 psi | 85% | 3091 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 54,244 psi | 85% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,012 psi | 85% | 3166 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 90% | 54,998 psi | 86% | 3159 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 56,869 psi | 89% | 3232 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 94% | 54,346 psi | 85% | 3232 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,884 psi | 89% | 3205 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,969 psi | 86% | 3087 fps | 100% |
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% | 43,961 psi | 69% | 2871 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 46,021 psi | 72% | 3012 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 48,283 psi | 76% | 3018 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 43,569 psi | 68% | 2956 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 34,548 psi | 54% | 2730 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 94% | 45,963 psi | 72% | 3081 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 29,530 psi | 46% | 2625 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,747 psi | 76% | 3018 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,254 psi | 76% | 3012 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,251 psi | 69% | 2959 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,946 psi | 67% | 2890 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,130 psi | 58% | 2822 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,023 psi | 77% | 3074 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 47,355 psi | 74% | 3071 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,094 psi | 74% | 3054 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,918 psi | 70% | 2927 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 41,060 psi | 64% | 2887 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 34,606 psi | 54% | 2743 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 44,251 psi | 69% | 2959 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 35,099 psi | 55% | 2749 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 46,122 psi | 72% | 2956 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,310 psi | 71% | 2940 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,953 psi | 81% | 2992 fps | 100% |
| Hodgdon Retumbo | 77.4 gr | 80% | 36,318 psi | 57% | 2867 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 44% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,882 psi | 84% | 3061 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,920 psi | 74% | 2943 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 42,293 psi | 66% | 2936 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,911 psi | 56% | 2795 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 37,666 psi | 59% | 2736 fps | 99.3% |
| Norma 217 | <<locked>> | 84% | 31,372 psi | 49% | 2687 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 47,181 psi | 74% | 3035 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 42,453 psi | 67% | 2946 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 80% | 38,159 psi | 60% | 2808 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,906 psi | 45% | 1877 fps | 100% |
| ReloadSwiss RS 76 | 82.8 gr | 80% | 35,650 psi | 56% | 2835 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,247 psi | 60% | 2858 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 49,052 psi | 77% | 2992 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 47,819 psi | 75% | 2999 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,471 psi | 74% | 2995 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,140 psi | 79% | 2979 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 48,095 psi | 75% | 2969 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,119 psi | 66% | 2841 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 50,705 psi | 79% | 3025 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 47,529 psi | 74% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,789 psi | 73% | 3031 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 38,595 psi | 60% | 2825 fps | 96.2% |
| Vihtavuori N568 | <<locked>> | 84% | 39,407 psi | 62% | 2884 fps | 95% |
| Vihtavuori N570 | 90.3 gr | 90% | 46,702 psi | 73% | 3081 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,655 psi | 65% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,425 psi | 70% | 2897 fps | 99% |
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 51 powders for 7 mm KM Katzmaier loaded with the .284 | 145gr | Peregrine Glider GRM. Hodgdon Retumbo delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 2,047 fps to 3,287 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 51 of the 51 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 145.0 gr projectile in 0.284" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm KM Katzmaier with the .284 | 145gr | Peregrine Glider GRM 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.