Load Specifications
Load data in caliber 7-.300 Norma Mag. with .284 | 140gr | Sierra GameKing bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 56,521 psi | 89% | 3166 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,029 psi | 89% | 3196 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,361 psi | 87% | 3274 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 86% | 54,244 psi | 85% | 3202 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 56,173 psi | 88% | 3274 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 98% | 54,447 psi | 85% | 3238 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 3261 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,389 psi | 85% | 3199 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,450 psi | 90% | 3251 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,565 psi | 89% | 3271 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,389 psi | 85% | 3176 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,317 psi | 85% | 3245 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,926 psi | 86% | 3264 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 3330 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,029 psi | 89% | 3228 fps | 97.6% |
| Bofors RP15 | <<locked>> | 92% | 55,753 psi | 87% | 3255 fps | 99.8% |
| Bofors RP30 | <<locked>> | 96% | 54,215 psi | 85% | 3251 fps | 99.5% |
| Bofors RP5 | <<locked>> | 90% | 56,565 psi | 89% | 3271 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 56,014 psi | 88% | 3264 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 55,579 psi | 87% | 3202 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,346 psi | 85% | 3182 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,505 psi | 85% | 3114 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,188 psi | 90% | 3399 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 59% | 2064 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,753 psi | 89% | 3179 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,276 psi | 90% | 3182 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,173 psi | 88% | 3182 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 90% | 54,259 psi | 85% | 3251 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,283 psi | 76% | 3159 fps | 98.6% |
| Lovex S065 | <<locked>> | 82% | 56,942 psi | 89% | 3156 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,390 psi | 87% | 3156 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,447 psi | 85% | 3136 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,201 psi | 85% | 3179 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 3189 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,507 psi | 89% | 3287 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,187 psi | 86% | 3173 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,317 psi | 87% | 3274 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 82% | 54,157 psi | 85% | 3179 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 53,896 psi | 84% | 3199 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,392 psi | 60% | 2113 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,130 psi | 90% | 3215 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,680 psi | 87% | 3245 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,911 psi | 84% | 3317 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 53,417 psi | 84% | 3268 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 86% | 54,969 psi | 86% | 3169 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 88% | 57,159 psi | 90% | 3241 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,942 psi | 89% | 3156 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,390 psi | 87% | 3156 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,811 psi | 87% | 3104 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,753 psi | 89% | 3238 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,391 psi | 88% | 3156 fps | 99% |
| Somchem S365 | <<locked>> | 84% | 56,420 psi | 88% | 3176 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,450 psi | 90% | 3205 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,739 psi | 89% | 3163 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,421 psi | 90% | 3189 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 56,014 psi | 88% | 3166 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,347 psi | 88% | 3205 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,028 psi | 88% | 3287 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 94% | 56,782 psi | 89% | 3274 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 96% | 54,070 psi | 85% | 3274 fps | 98.2% |
| Vihtavuori N570 | <<locked>> | 98% | 55,085 psi | 86% | 3333 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,246 psi | 88% | 3107 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 53,548 psi | 84% | 3261 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,464 psi | 90% | 3202 fps | 99.9% |
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% | 40,292 psi | 63% | 2867 fps | 99.3% |
| Accurate 4350 | <<locked>> | 80% | 53,243 psi | 83% | 3136 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,510 psi | 65% | 2986 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 44,237 psi | 69% | 3009 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 39,639 psi | 62% | 2933 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 38,638 psi | 61% | 2904 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 84% | 30,792 psi | 48% | 2726 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,821 psi | 80% | 3136 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,222 psi | 69% | 2999 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,234 psi | 63% | 2943 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,885 psi | 61% | 2890 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,620 psi | 53% | 2805 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,787 psi | 69% | 3064 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 48,196 psi | 76% | 3176 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,123 psi | 74% | 3035 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 37,405 psi | 59% | 2871 fps | 96.3% |
| Bofors RP30 | <<locked>> | 84% | 35,824 psi | 56% | 2851 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 40,234 psi | 63% | 2943 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 84% | 36,753 psi | 58% | 2858 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 42,119 psi | 66% | 2936 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,495 psi | 65% | 2920 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,761 psi | 75% | 3002 fps | 100% |
| Hodgdon Retumbo | 72.4 gr | 80% | 32,851 psi | 51% | 2831 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 44% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,937 psi | 78% | 3061 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 50,227 psi | 79% | 3068 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,468 psi | 68% | 2936 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 80% | 38,305 psi | 60% | 2910 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,724 psi | 58% | 2897 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 53,447 psi | 84% | 3097 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,938 psi | 81% | 3097 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,679 psi | 54% | 2733 fps | 98% |
| Norma 204 | <<locked>> | 80% | 50,575 psi | 79% | 3114 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 32,198 psi | 50% | 2789 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 42,482 psi | 67% | 3018 fps | 99% |
| Norma URP | <<locked>> | 80% | 51,663 psi | 81% | 3114 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,087 psi | 60% | 2917 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 50,546 psi | 79% | 3117 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,200 psi | 54% | 2782 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,776 psi | 45% | 1893 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,345 psi | 84% | 3156 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,793 psi | 81% | 3182 fps | 100% |
| ReloadSwiss RS 76 | 77.5 gr | 80% | 32,024 psi | 50% | 2799 fps | 96.1% |
| ReloadSwiss RS 80 | 87.9 gr | 90% | 42,438 psi | 67% | 3045 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 45,266 psi | 71% | 2982 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 43,642 psi | 68% | 2986 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,447 psi | 84% | 3097 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,938 psi | 81% | 3097 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,359 psi | 82% | 3045 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,308 psi | 68% | 2979 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 46,209 psi | 72% | 2966 fps | 97.1% |
| Somchem S365 | <<locked>> | 80% | 49,240 psi | 77% | 3064 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,266 psi | 69% | 2966 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 53,127 psi | 83% | 3107 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,508 psi | 60% | 2825 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 80% | 52,533 psi | 82% | 3110 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,410 psi | 68% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,322 psi | 66% | 3009 fps | 96.2% |
| Vihtavuori N565 | <<locked>> | 84% | 40,219 psi | 63% | 2936 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 90% | 43,482 psi | 68% | 3058 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 96% | 51,184 psi | 80% | 3261 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,562 psi | 82% | 3054 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,201 psi | 57% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,582 psi | 64% | 2881 fps | 97.4% |
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 71 powders for 7-.300 Norma Mag. loaded with the .284 | 140gr | Sierra GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,399 fps; across all powders the maximum-charge window runs from 2,064 fps to 3,399 fps. ADI AR 2218 gives the best case fill at 100 %, and 71 of the 71 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 140.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for 7-.300 Norma Mag. with the .284 | 140gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, 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.