Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 150gr | Lapua Mega bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Vihtavuori N560.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 57,188 psi | 90% | 3136 fps | 98.9% |
| Accurate 3100 | <<locked>> | 98% | 56,927 psi | 89% | 3186 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 56,869 psi | 89% | 3120 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,795 psi | 86% | 3179 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 54,462 psi | 85% | 3274 fps | 97% |
| ADI AR 2208 | <<locked>> | 84% | 56,405 psi | 88% | 3153 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,564 psi | 87% | 3225 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 98% | 57,203 psi | 90% | 3284 fps | 97.3% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,854 psi | 88% | 3225 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,595 psi | 90% | 3179 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,638 psi | 90% | 3202 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,492 psi | 87% | 3245 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,884 psi | 89% | 3261 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,129 psi | 86% | 3212 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,739 psi | 89% | 3281 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 3261 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,676 psi | 78% | 3182 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,128 psi | 85% | 3287 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 3261 fps | 98.2% |
| Bofors RP3 | <<locked>> | 82% | 54,940 psi | 86% | 3140 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 56,739 psi | 89% | 3281 fps | 98.5% |
| Bofors RP7 | <<locked>> | 88% | 57,740 psi | 90% | 3182 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,139 psi | 77% | 3120 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 82% | 55,303 psi | 87% | 3159 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 56,782 psi | 89% | 3235 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 86% | 55,912 psi | 88% | 3189 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 96% | 57,188 psi | 90% | 3222 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,130 psi | 88% | 3202 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,869 psi | 88% | 3159 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,704 psi | 76% | 3232 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 88% | 57,305 psi | 90% | 3271 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 57% | 2031 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,912 psi | 88% | 3133 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,521 psi | 87% | 3159 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,695 psi | 87% | 3153 fps | 99.1% |
| IMR 4831 | <<locked>> | 90% | 55,216 psi | 87% | 3173 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,766 psi | 86% | 3146 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 98% | 54,650 psi | 86% | 3255 fps | 96.9% |
| Lovex S062 | <<locked>> | 82% | 56,188 psi | 88% | 3127 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,072 psi | 88% | 3150 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 57,740 psi | 90% | 3199 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,647 psi | 79% | 3084 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 56,927 psi | 89% | 3186 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,492 psi | 89% | 3215 fps | 98.1% |
| Norma MRP | <<locked>> | 96% | 56,579 psi | 89% | 3307 fps | 99.4% |
| Norma URP | <<locked>> | 90% | 56,927 psi | 89% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,347 psi | 87% | 3271 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 90% | 55,709 psi | 87% | 3219 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,679 psi | 84% | 3205 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,420 psi | 59% | 2077 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,955 psi | 86% | 3136 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,275 psi | 88% | 3255 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,737 psi | 86% | 3202 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,942 psi | 89% | 3294 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,197 psi | 77% | 3225 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 84% | 55,187 psi | 86% | 3136 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,101 psi | 89% | 3196 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 94% | 54,549 psi | 85% | 3202 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 88% | 57,740 psi | 90% | 3182 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,072 psi | 88% | 3150 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 56,188 psi | 88% | 3127 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,740 psi | 90% | 3199 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,753 psi | 89% | 3196 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,506 psi | 87% | 3015 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,608 psi | 87% | 3097 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,114 psi | 85% | 3196 fps | 98% |
| Somchem S355 | <<locked>> | 84% | 55,013 psi | 86% | 3133 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,216 psi | 87% | 3120 fps | 96.2% |
| Somchem S365 | <<locked>> | 92% | 56,855 psi | 89% | 3222 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,071 psi | 86% | 3173 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 86% | 56,289 psi | 88% | 3104 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,303 psi | 87% | 3159 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,534 psi | 85% | 3143 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 82% | 57,087 psi | 89% | 3104 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,462 psi | 85% | 3159 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 96% | 56,217 psi | 88% | 3232 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,550 psi | 89% | 3294 fps | 96.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,272 psi | 82% | 3192 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,839 psi | 86% | 3114 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,782 psi | 89% | 3235 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,404 psi | 85% | 3337 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,187 psi | 86% | 3163 fps | 98% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 53,490 psi | 84% | 3074 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 35,288 psi | 55% | 2753 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 53,534 psi | 84% | 3068 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,437 psi | 65% | 2923 fps | 98.7% |
| Accurate High Country | <<locked>> | 90% | 47,224 psi | 74% | 3130 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 49,835 psi | 78% | 3038 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 45,455 psi | 71% | 3028 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 94% | 49,821 psi | 78% | 3146 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 42,946 psi | 67% | 2966 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,662 psi | 79% | 3064 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,070 psi | 85% | 3143 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,798 psi | 62% | 2930 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,847 psi | 72% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 45,368 psi | 71% | 3022 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 43,221 psi | 68% | 3015 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,573 psi | 46% | 2657 fps | 96.7% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,533 psi | 53% | 2792 fps | 95.1% |
| Alliant Reloder-26 | 77.9 gr | 80% | 31,966 psi | 50% | 2782 fps | 95.2% |
| Bofors RP15 | <<locked>> | 94% | 45,571 psi | 71% | 3064 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 51,474 psi | 81% | 3081 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 43,221 psi | 68% | 3015 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 44,875 psi | 70% | 2940 fps | 96.8% |
| Hodgdon H1000 | <<locked>> | 98% | 45,890 psi | 72% | 3048 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 51,663 psi | 81% | 3094 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 43,221 psi | 68% | 2972 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 45,963 psi | 72% | 2999 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 94% | 53,476 psi | 84% | 3156 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 52,272 psi | 82% | 3133 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,565 psi | 59% | 2815 fps | 99.2% |
| Hodgdon Retumbo | <<locked>> | 96% | 42,670 psi | 67% | 3084 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 42,467 psi | 67% | 2986 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 43% | 1818 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,446 psi | 82% | 3077 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,350 psi | 63% | 2854 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,267 psi | 73% | 2972 fps | 97.5% |
| IMR 4831 | <<locked>> | 80% | 39,711 psi | 62% | 2871 fps | 98.4% |
| IMR 4955 Enduron | <<locked>> | 92% | 51,372 psi | 81% | 3084 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 94% | 47,732 psi | 75% | 3114 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 52,895 psi | 83% | 3074 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,874 psi | 69% | 2917 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 41,989 psi | 66% | 2894 fps | 96.7% |
| Lovex S071 | <<locked>> | 90% | 36,680 psi | 57% | 2785 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 53,432 psi | 84% | 3127 fps | 100% |
| Norma 204 | <<locked>> | 84% | 46,021 psi | 72% | 3018 fps | 95.8% |
| Norma MRP | 81.2 gr | 86% | 39,465 psi | 62% | 2956 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 40,857 psi | 64% | 2913 fps | 98.5% |
| Ramshot Grand | <<locked>> | 94% | 47,848 psi | 75% | 3130 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 39,813 psi | 62% | 2897 fps | 96.7% |
| Ramshot Magnum | <<locked>> | 94% | 42,728 psi | 67% | 2989 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 44% | 1860 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,401 psi | 81% | 3074 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,660 psi | 76% | 3130 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,365 psi | 65% | 2943 fps | 98.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,900 psi | 63% | 2949 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 39,624 psi | 62% | 2992 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 48,399 psi | 76% | 3022 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 50,154 psi | 79% | 3068 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 88% | 44,599 psi | 70% | 3005 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 44,875 psi | 70% | 2940 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,874 psi | 69% | 2917 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 52,895 psi | 83% | 3074 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,989 psi | 66% | 2894 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,763 psi | 78% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,066 psi | 77% | 2913 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,902 psi | 67% | 2858 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 44,208 psi | 69% | 2999 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 48,573 psi | 76% | 3022 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 51,706 psi | 81% | 3058 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,521 psi | 59% | 2867 fps | 99.8% |
| Somchem S385 | <<locked>> | 84% | 39,624 psi | 62% | 2858 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 46,311 psi | 73% | 2940 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,293 psi | 66% | 2913 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 41,814 psi | 66% | 2900 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,461 psi | 84% | 3048 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,814 psi | 66% | 2917 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 32,924 psi | 52% | 2743 fps | 96.8% |
| Vihtavuori N560 | 88.8 gr | 94% | 52,663 psi | 83% | 3225 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 98% | 48,675 psi | 76% | 3123 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,437 psi | 65% | 2877 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 43,395 psi | 68% | 2976 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,194 psi | 41% | 2621 fps | 95.3% |
| Winchester Supreme 780 | <<locked>> | 90% | 44,643 psi | 70% | 2966 fps | 95.6% |
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 82 powders for .300 Norma Mag. loaded with the .308 | 150gr | Lapua Mega. Winchester StaBALL HD delivers the highest muzzle velocity at 3,337 fps; across all powders the maximum-charge window runs from 2,031 fps to 3,337 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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. Norma MRP, Alliant Reloder-26, Vihtavuori N560 rank at the top here: for .300 Norma Mag. with the .308 | 150gr | Lapua Mega 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.