Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | Barnes X S bullet and 31 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Alliant Reloder-50 and Alliant Reloder-33.
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 8700 | <<locked>> | 98% | 55,999 psi | 88% | 2943 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 88% | 54,795 psi | 86% | 2910 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 55,434 psi | 87% | 3051 fps | 99.7% |
| ADI AR 2225 | <<locked>> | 90% | 55,259 psi | 87% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 84% | 55,230 psi | 87% | 2900 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 54,027 psi | 85% | 2963 fps | 99.2% |
| Alliant Reloder-50 | <<locked>> | 92% | 55,361 psi | 87% | 2979 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 57,566 psi | 90% | 2927 fps | 99.6% |
| Bofors RP15 | <<locked>> | 82% | 55,317 psi | 87% | 2907 fps | 100% |
| Bofors RP30 | <<locked>> | 86% | 55,550 psi | 87% | 2933 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 56,289 psi | 88% | 2930 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,029 psi | 89% | 2907 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 55,187 psi | 86% | 2999 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,450 psi | 60% | 1886 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 56,463 psi | 88% | 2940 fps | 95.9% |
| IMR 7977 Enduron | <<locked>> | 86% | 55,187 psi | 86% | 2835 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 92% | 54,752 psi | 86% | 2940 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 57,043 psi | 89% | 2897 fps | 96.5% |
| Lovex S071 | <<locked>> | 84% | 55,042 psi | 86% | 2808 fps | 100% |
| Norma 217 | <<locked>> | 92% | 56,579 psi | 89% | 2959 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,581 psi | 62% | 1929 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 55,854 psi | 88% | 2979 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 55,317 psi | 87% | 2963 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 57,043 psi | 89% | 2897 fps | 96.5% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 57,667 psi | 90% | 2946 fps | 99.1% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 55,216 psi | 87% | 2930 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 82% | 55,695 psi | 87% | 2835 fps | 100% |
| Vihtavuori N170 | <<locked>> | 86% | 55,506 psi | 87% | 2884 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 84% | 57,087 psi | 89% | 2943 fps | 100% |
| Vihtavuori N568 | <<locked>> | 86% | 55,390 psi | 87% | 2963 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 57,101 psi | 89% | 3035 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 8700 | <<locked>> | 88% | 39,755 psi | 62% | 2641 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 80% | 42,003 psi | 66% | 2687 fps | 99.5% |
| ADI AR 2218 | 83.8 gr | 82% | 39,204 psi | 61% | 2713 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 39,581 psi | 62% | 2674 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 48,573 psi | 76% | 2795 fps | 100% |
| Alliant Reloder-33 | 83.2 gr | 80% | 40,959 psi | 64% | 2710 fps | 96.4% |
| Alliant Reloder-50 | 85 gr | 82% | 39,421 psi | 62% | 2667 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 50,865 psi | 80% | 2818 fps | 98.9% |
| Bofors RP15 | <<locked>> | 80% | 52,025 psi | 82% | 2858 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 45,861 psi | 72% | 2769 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 43,149 psi | 68% | 2710 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 50,285 psi | 79% | 2795 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 48,095 psi | 75% | 2884 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,964 psi | 45% | 1686 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 52,765 psi | 83% | 2877 fps | 95% |
| IMR 7977 Enduron | <<locked>> | 82% | 48,776 psi | 76% | 2723 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 37,434 psi | 59% | 2608 fps | 98.5% |
| Lovex D100 | <<locked>> | 88% | 53,316 psi | 84% | 2838 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 48,776 psi | 76% | 2710 fps | 100% |
| Norma 217 | <<locked>> | 80% | 38,363 psi | 60% | 2638 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,878 psi | 47% | 1729 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 48,211 psi | 76% | 2861 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 44,788 psi | 70% | 2779 fps | 99.1% |
| Shooters World 50 BMG | <<locked>> | 88% | 53,316 psi | 84% | 2838 fps | 95.6% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 41,901 psi | 66% | 2664 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 94% | 45,252 psi | 71% | 2749 fps | 95% |
| Vihtavuori N165 | <<locked>> | 80% | 52,373 psi | 82% | 2785 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 45,890 psi | 72% | 2710 fps | 96.3% |
| Vihtavuori N565 | <<locked>> | 80% | 50,401 psi | 79% | 2835 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 45,426 psi | 71% | 2785 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 80% | 43,482 psi | 68% | 2782 fps | 96.7% |
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 31 powders for 7 mm KM Katzmaier loaded with the .284 | 175gr | Barnes X S. ADI AR 2218 delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,051 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 31 of the 31 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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. ADI AR 2218, Alliant Reloder-50, Alliant Reloder-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 175gr | Barnes X S 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.