Load Specifications
Bullet Manufacturer:Barnes
Bullet Weight:150 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:7 mm KM Katzmaier load data
Case Length (l3):2.72"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:112.5 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:25.6"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:11.5
Load data in caliber 7 mm KM Katzmaier with .284 | 150gr | Barnes TTSX BT bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 55,695 psi | 87% | 3031 fps | 100% |
| Accurate 3100 | <<locked>> | 86% | 56,492 psi | 89% | 3041 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,399 psi | 76% | 2995 fps | 96.4% |
| Accurate High Country | <<locked>> | 82% | 54,868 psi | 86% | 3150 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 84% | 55,071 psi | 86% | 3143 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 84% | 55,811 psi | 87% | 3156 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 84% | 57,217 psi | 90% | 3130 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 53,940 psi | 85% | 3077 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,970 psi | 88% | 3146 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 56,594 psi | 89% | 3156 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 55,042 psi | 86% | 3123 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 55,854 psi | 88% | 3133 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 55,811 psi | 87% | 3248 fps | 98.8% |
| ADI AR 2218 | <<locked>> | 98% | 56,608 psi | 89% | 3261 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 96% | 54,317 psi | 85% | 3143 fps | 100% |
| ADI AR 2225 | <<locked>> | 96% | 55,274 psi | 87% | 3153 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 57,276 psi | 90% | 3123 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 54,244 psi | 85% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,681 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,290 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,391 psi | 88% | 3140 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,971 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,404 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,230 psi | 87% | 3048 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,027 psi | 86% | 3117 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,869 psi | 88% | 3127 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,984 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,840 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,638 psi | 90% | 3222 fps | 98.7% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,230 psi | 85% | 3159 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3209 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,186 psi | 85% | 3150 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,362 psi | 88% | 3104 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,971 psi | 89% | 3114 fps | 98.8% |
| Bofors RP15 | <<locked>> | 88% | 55,796 psi | 87% | 3127 fps | 100% |
| Bofors RP15 | <<locked>> | 88% | 56,362 psi | 88% | 3136 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,969 psi | 86% | 3133 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 55,738 psi | 87% | 3146 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,391 psi | 88% | 3140 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,971 psi | 89% | 3146 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,492 psi | 89% | 3143 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,479 psi | 90% | 3159 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,592 psi | 86% | 3071 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 84% | 55,361 psi | 87% | 3084 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,566 psi | 90% | 3120 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,215 psi | 85% | 3068 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,276 psi | 90% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,549 psi | 85% | 3209 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,463 psi | 87% | 3222 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 59% | 2021 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,797 psi | 59% | 2024 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,013 psi | 86% | 3054 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,564 psi | 87% | 3061 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 54,360 psi | 85% | 3127 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 86% | 55,172 psi | 86% | 3140 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,101 psi | 89% | 3182 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,230 psi | 85% | 3136 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 57,682 psi | 90% | 3058 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 54,737 psi | 86% | 3015 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,534 psi | 85% | 3143 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,535 psi | 87% | 3156 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,362 psi | 88% | 3150 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,174 psi | 90% | 3163 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,593 psi | 87% | 3150 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,434 psi | 88% | 3163 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 54,085 psi | 85% | 3071 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 54,868 psi | 86% | 3084 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 61% | 2064 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,725 psi | 61% | 2070 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,288 psi | 87% | 3189 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,333 psi | 88% | 3202 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,491 psi | 85% | 3153 fps | 99.5% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,405 psi | 87% | 3166 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 84% | 57,551 psi | 90% | 3097 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 54,331 psi | 85% | 3048 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 56,463 psi | 88% | 3107 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 57,116 psi | 90% | 3120 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,443 psi | 77% | 2995 fps | 96.2% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,183 psi | 79% | 3009 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,086 psi | 88% | 3104 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,739 psi | 89% | 3114 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,230 psi | 87% | 3025 fps | 99.6% |
| Somchem S361 | <<locked>> | 82% | 55,695 psi | 87% | 3035 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 56,681 psi | 89% | 3071 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 57,261 psi | 90% | 3084 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,913 psi | 89% | 3061 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,638 psi | 90% | 3071 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,115 psi | 88% | 3084 fps | 97.1% |
| Vihtavuori N170 | <<locked>> | 92% | 56,927 psi | 89% | 3097 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 84% | 55,985 psi | 88% | 3068 fps | 100% |
| Vihtavuori N555 | <<locked>> | 84% | 56,666 psi | 89% | 3074 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,738 psi | 87% | 3156 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 56,521 psi | 89% | 3169 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 57,000 psi | 89% | 3150 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 90% | 57,725 psi | 90% | 3159 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 54,984 psi | 86% | 3159 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 92% | 55,912 psi | 88% | 3173 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 94% | 56,362 psi | 88% | 3225 fps | 98.2% |
| Vihtavuori N570 | <<locked>> | 94% | 57,334 psi | 90% | 3241 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,042 psi | 86% | 3130 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,811 psi | 87% | 3140 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,579 psi | 89% | 3071 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,334 psi | 90% | 3084 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% | 45,281 psi | 71% | 2858 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 45,905 psi | 72% | 2867 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 44,730 psi | 70% | 2923 fps | 95.2% |
| Accurate High Country | <<locked>> | 80% | 50,981 psi | 80% | 3077 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 47,616 psi | 75% | 3005 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 80% | 48,385 psi | 76% | 3018 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 80% | 49,821 psi | 78% | 3005 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 80% | 50,444 psi | 79% | 3018 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 45,107 psi | 71% | 2946 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 45,716 psi | 72% | 2959 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 80% | 33,344 psi | 52% | 2664 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 80% | 33,852 psi | 53% | 2674 fps | 95.5% |
| ADI AR 2218 | 95.9 gr | 92% | 44,367 psi | 70% | 3012 fps | 95.6% |
| ADI AR 2218 | 95.9 gr | 92% | 44,947 psi | 70% | 3022 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 30,661 psi | 48% | 2628 fps | 97.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,024 psi | 49% | 2635 fps | 97.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 50,038 psi | 78% | 3002 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 50,647 psi | 79% | 3012 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,559 psi | 78% | 2995 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,169 psi | 79% | 3005 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,774 psi | 72% | 2949 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,369 psi | 73% | 2959 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,512 psi | 70% | 2877 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,991 psi | 71% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,609 psi | 61% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,247 psi | 62% | 2825 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,879 psi | 80% | 3058 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,735 psi | 81% | 3071 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,701 psi | 72% | 2999 fps | 96.1% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,105 psi | 68% | 2940 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,498 psi | 71% | 2982 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,325 psi | 73% | 2995 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,105 psi | 68% | 2851 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,700 psi | 68% | 2864 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 42,482 psi | 67% | 2877 fps | 98.8% |
| Bofors RP15 | <<locked>> | 80% | 43,091 psi | 68% | 2890 fps | 99% |
| Bofors RP30 | <<locked>> | 80% | 35,868 psi | 56% | 2740 fps | 96.4% |
| Bofors RP30 | <<locked>> | 80% | 36,448 psi | 57% | 2753 fps | 96.6% |
| Bofors RP5 | <<locked>> | 80% | 45,774 psi | 72% | 2949 fps | 99.4% |
| Bofors RP5 | <<locked>> | 80% | 46,369 psi | 73% | 2959 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 36,390 psi | 57% | 2746 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 80% | 36,927 psi | 58% | 2759 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 47,572 psi | 75% | 2943 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 80% | 48,138 psi | 75% | 2956 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,746 psi | 73% | 2927 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,282 psi | 74% | 2940 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,563 psi | 84% | 2972 fps | 100% |
| Hodgdon Retumbo | 78.7 gr | 80% | 37,782 psi | 59% | 2867 fps | 98.7% |
| Hodgdon Retumbo | 78.7 gr | 80% | 38,232 psi | 60% | 2874 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1811 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1814 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,225 psi | 76% | 2933 fps | 98.8% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,776 psi | 76% | 2940 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 80% | 43,859 psi | 69% | 2927 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 44,483 psi | 70% | 2940 fps | 98.5% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,824 psi | 55% | 2726 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,505 psi | 56% | 2743 fps | 96.1% |
| Lovex S071 | <<locked>> | 80% | 38,870 psi | 61% | 2726 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 39,465 psi | 62% | 2740 fps | 99.7% |
| Norma 217 | <<locked>> | 82% | 30,487 psi | 48% | 2621 fps | 96.1% |
| Norma 217 | <<locked>> | 80% | 28,718 psi | 45% | 2566 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 48,849 psi | 77% | 3022 fps | 100% |
| Norma MRP | <<locked>> | 80% | 49,472 psi | 78% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,179 psi | 69% | 2940 fps | 98.7% |
| Ramshot Grand | <<locked>> | 80% | 44,860 psi | 70% | 2953 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 80% | 39,668 psi | 62% | 2802 fps | 99% |
| Ramshot Magnum | <<locked>> | 80% | 40,422 psi | 63% | 2818 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,066 psi | 46% | 1854 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 46% | 1857 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,130 psi | 58% | 2835 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,840 psi | 59% | 2848 fps | 99.5% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 36,840 psi | 58% | 2782 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 37,521 psi | 59% | 2799 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 50,314 psi | 79% | 2976 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 80% | 50,879 psi | 80% | 2986 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 49,371 psi | 77% | 2986 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 49,821 psi | 78% | 2995 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,006 psi | 72% | 2927 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,746 psi | 73% | 2940 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,023 psi | 77% | 2982 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,472 psi | 78% | 2992 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 51,503 psi | 81% | 2963 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 52,011 psi | 82% | 2972 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 49,588 psi | 78% | 2956 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 50,183 psi | 79% | 2966 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,337 psi | 68% | 2825 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 80% | 43,888 psi | 69% | 2835 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 48,921 psi | 77% | 2953 fps | 95.4% |
| Vihtavuori N170 | <<locked>> | 88% | 49,545 psi | 78% | 2966 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 48,979 psi | 77% | 2956 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 49,661 psi | 78% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,385 psi | 76% | 3022 fps | 98.8% |
| Vihtavuori N560 | <<locked>> | 80% | 49,008 psi | 77% | 3035 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 40,045 psi | 63% | 2818 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 80% | 40,727 psi | 64% | 2835 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 84% | 40,959 psi | 64% | 2881 fps | 96.1% |
| Vihtavuori N568 | <<locked>> | 82% | 38,595 psi | 60% | 2822 fps | 95.2% |
| Vihtavuori N570 | 89.9 gr | 88% | 45,223 psi | 71% | 3005 fps | 95.4% |
| Vihtavuori N570 | 89.9 gr | 88% | 45,963 psi | 72% | 3022 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,613 psi | 68% | 2943 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,353 psi | 70% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,847 psi | 72% | 2884 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,412 psi | 73% | 2897 fps | 99.5% |
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 103 powders for 7 mm KM Katzmaier loaded with the .284 | 150gr | Barnes TTSX BT. ADI AR 2218 delivers the highest muzzle velocity at 3,261 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,261 fps. Accurate 8700 gives the best case fill at 100 %, and 103 of the 103 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 150.0 gr projectile in 0.284" calls for a 1:11.5 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for 7 mm KM Katzmaier with the .284 | 150gr | Barnes TTSX BT 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.