Load Specifications
Load data in caliber 7-.300 Norma Mag. with .284 | 158gr | Prvi Partizan Grom bullet and 54 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 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.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 54,143 psi | 85% | 2969 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 55,912 psi | 88% | 3133 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 86% | 56,710 psi | 89% | 3136 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 84% | 55,245 psi | 87% | 3058 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 57,421 psi | 90% | 3133 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 56,159 psi | 88% | 3110 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,608 psi | 89% | 3238 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 98% | 55,027 psi | 86% | 3130 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,463 psi | 87% | 3054 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,463 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,882 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,186 psi | 85% | 3068 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,956 psi | 88% | 3028 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,318 psi | 88% | 3104 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,652 psi | 89% | 3120 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,317 psi | 85% | 3143 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,969 psi | 85% | 3130 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,317 psi | 85% | 3031 fps | 98.2% |
| Bofors RP15 | <<locked>> | 90% | 57,261 psi | 90% | 3117 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,246 psi | 88% | 3127 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 54,186 psi | 85% | 3068 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 53,867 psi | 84% | 3071 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 56,420 psi | 88% | 3061 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,390 psi | 87% | 3045 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,593 psi | 87% | 2959 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,477 psi | 87% | 3199 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,826 psi | 59% | 1955 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,377 psi | 90% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,652 psi | 89% | 3035 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 55,869 psi | 88% | 3117 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,172 psi | 85% | 3110 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 55,956 psi | 88% | 2995 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,376 psi | 87% | 3133 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,288 psi | 85% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,159 psi | 90% | 3140 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 55,492 psi | 87% | 3064 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,827 psi | 61% | 2001 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,217 psi | 88% | 3182 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,550 psi | 87% | 3146 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 55,680 psi | 87% | 3025 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 54,592 psi | 86% | 3038 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,201 psi | 85% | 3035 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,087 psi | 89% | 3018 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 57,711 psi | 90% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,955 psi | 86% | 3005 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,955 psi | 86% | 2995 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,696 psi | 90% | 3074 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 84% | 54,317 psi | 85% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,421 psi | 90% | 3146 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 54,737 psi | 86% | 3081 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 94% | 56,144 psi | 88% | 3153 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 96% | 57,435 psi | 90% | 3219 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,115 psi | 88% | 3120 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,578 psi | 86% | 2999 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,251 psi | 69% | 2802 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 48,544 psi | 76% | 2999 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 80% | 45,948 psi | 72% | 2936 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 80% | 48,298 psi | 76% | 2936 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 43,569 psi | 68% | 2877 fps | 98.3% |
| ADI AR 2217 | <<locked>> | 82% | 34,766 psi | 54% | 2671 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 94% | 45,484 psi | 71% | 3009 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 29,834 psi | 47% | 2572 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,631 psi | 76% | 2936 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,631 psi | 76% | 2936 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,182 psi | 76% | 2930 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,338 psi | 69% | 2884 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,018 psi | 67% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,318 psi | 58% | 2756 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,936 psi | 77% | 2995 fps | 100% |
| Alliant Reloder-33 | 87.7 gr | 90% | 43,294 psi | 68% | 2927 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 46,441 psi | 73% | 2986 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 41,959 psi | 66% | 2785 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 41,220 psi | 65% | 2815 fps | 98.6% |
| Bofors RP30 | <<locked>> | 80% | 34,824 psi | 55% | 2684 fps | 96.1% |
| Bofors RP5 | <<locked>> | 80% | 44,338 psi | 69% | 2884 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 35,302 psi | 55% | 2687 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 80% | 46,006 psi | 72% | 2874 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,310 psi | 71% | 2861 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,996 psi | 81% | 2907 fps | 100% |
| Hodgdon Retumbo | 72.3 gr | 80% | 36,463 psi | 57% | 2802 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1749 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,853 psi | 84% | 2972 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,963 psi | 74% | 2864 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 42,264 psi | 66% | 2861 fps | 98% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,576 psi | 53% | 2674 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 38,203 psi | 60% | 2674 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 29,530 psi | 46% | 2575 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 47,065 psi | 74% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,482 psi | 67% | 2874 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 80% | 38,276 psi | 60% | 2743 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,153 psi | 46% | 1791 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,665 psi | 56% | 2772 fps | 99% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,101 psi | 60% | 2799 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 49,037 psi | 77% | 2910 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 80% | 47,761 psi | 75% | 2917 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,413 psi | 74% | 2913 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 50,024 psi | 78% | 2897 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 53,998 psi | 85% | 2969 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,269 psi | 76% | 2890 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,192 psi | 66% | 2766 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 90% | 50,502 psi | 79% | 2949 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 47,747 psi | 75% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,688 psi | 73% | 2953 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 80% | 38,827 psi | 61% | 2762 fps | 96.7% |
| Vihtavuori N568 | <<locked>> | 84% | 39,305 psi | 62% | 2815 fps | 95.5% |
| Vihtavuori N570 | 84.4 gr | 90% | 46,325 psi | 73% | 3009 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,495 psi | 65% | 2881 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,411 psi | 70% | 2818 fps | 99.2% |
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 54 powders for 7-.300 Norma Mag. loaded with the .284 | 158gr | Prvi Partizan Grom. ADI AR 2218 delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 1,955 fps to 3,238 fps. ADI AR 2218 gives the best case fill at 100 %, and 54 of the 54 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 158.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 7-.300 Norma Mag. with the .284 | 158gr | Prvi Partizan Grom 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.