Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 155gr | Frontier RSBT bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and ADI AR 2213.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 55,114 psi | 86% | 3120 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 56,550 psi | 89% | 3166 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,595 psi | 90% | 3274 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 82% | 54,273 psi | 85% | 3077 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,392 psi | 90% | 3219 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 96% | 55,042 psi | 86% | 3209 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,959 psi | 64% | 2966 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,521 psi | 87% | 3104 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,290 psi | 90% | 3228 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,752 psi | 86% | 3186 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,898 psi | 89% | 3205 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,810 psi | 86% | 3205 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,898 psi | 88% | 3192 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,517 psi | 81% | 3182 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,434 psi | 88% | 3281 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,406 psi | 90% | 3251 fps | 98.7% |
| Bofors RP3 | <<locked>> | 82% | 56,507 psi | 89% | 3120 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,500 psi | 74% | 3094 fps | 96.2% |
| Bofors RP5 | <<locked>> | 96% | 54,810 psi | 86% | 3205 fps | 98.5% |
| Bofors RP7 | <<locked>> | 86% | 55,579 psi | 87% | 3107 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 3123 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 56,811 psi | 89% | 3143 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,578 psi | 86% | 3159 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 86% | 57,392 psi | 90% | 3176 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 94% | 55,027 psi | 86% | 3146 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,027 psi | 85% | 3130 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,609 psi | 90% | 3143 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,473 psi | 79% | 3232 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 86% | 55,100 psi | 86% | 3196 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,854 psi | 58% | 2005 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,145 psi | 90% | 3114 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,174 psi | 90% | 3150 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,058 psi | 89% | 3136 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 56,884 psi | 89% | 3156 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,362 psi | 88% | 3136 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 98% | 56,594 psi | 89% | 3251 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 57,609 psi | 90% | 3107 fps | 100% |
| Lovex S065 | <<locked>> | 86% | 54,273 psi | 85% | 3081 fps | 99.8% |
| Lovex S070 | <<locked>> | 88% | 55,709 psi | 87% | 3127 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,504 psi | 82% | 3077 fps | 99.6% |
| Norma 204 | <<locked>> | 88% | 54,433 psi | 85% | 3140 fps | 98.1% |
| Norma MRP | <<locked>> | 94% | 54,650 psi | 86% | 3235 fps | 99.4% |
| Norma URP | <<locked>> | 88% | 54,911 psi | 86% | 3146 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,363 psi | 90% | 3274 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 57,566 psi | 90% | 3209 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3202 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 59% | 2054 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,362 psi | 88% | 3123 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,143 psi | 85% | 3176 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,492 psi | 89% | 3189 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,766 psi | 86% | 3215 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,053 psi | 80% | 3228 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 84% | 56,797 psi | 89% | 3120 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,158 psi | 86% | 3127 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 94% | 56,260 psi | 88% | 3192 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 86% | 55,579 psi | 87% | 3107 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,273 psi | 85% | 3081 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 57,609 psi | 90% | 3107 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,709 psi | 87% | 3127 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,752 psi | 86% | 3123 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,884 psi | 89% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,232 psi | 90% | 3087 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,811 psi | 87% | 3186 fps | 98.6% |
| Somchem S355 | <<locked>> | 84% | 56,492 psi | 89% | 3114 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,869 psi | 89% | 3114 fps | 97% |
| Somchem S365 | <<locked>> | 90% | 55,129 psi | 86% | 3153 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,898 psi | 89% | 3163 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 84% | 54,230 psi | 85% | 3031 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,869 psi | 89% | 3143 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,391 psi | 88% | 3140 fps | 99% |
| Vihtavuori N550 | <<locked>> | 88% | 55,970 psi | 88% | 3143 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,549 psi | 85% | 3166 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,621 psi | 86% | 3222 fps | 96.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,259 psi | 85% | 3192 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,608 psi | 89% | 3097 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,766 psi | 86% | 3163 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3333 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,072 psi | 89% | 3159 fps | 98.6% |
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 3100 | <<locked>> | 82% | 34,055 psi | 53% | 2684 fps | 95.3% |
| Accurate 4350 | <<locked>> | 80% | 42,888 psi | 67% | 2917 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 53,664 psi | 84% | 3205 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 51,111 psi | 80% | 3022 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 44,005 psi | 69% | 2963 fps | 95.8% |
| ADI AR 2213 | 84.7 gr | 92% | 48,167 psi | 75% | 3077 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 38,392 psi | 60% | 2897 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,112 psi | 82% | 3048 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,118 psi | 64% | 2923 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,485 psi | 74% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 43,830 psi | 69% | 2953 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 41,800 psi | 66% | 2946 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,501 psi | 48% | 2654 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,590 psi | 51% | 2730 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,170 psi | 52% | 2785 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 44,092 psi | 69% | 2995 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 52,939 psi | 83% | 3061 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 44,367 psi | 70% | 3028 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 41,800 psi | 66% | 2946 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 46,079 psi | 72% | 2930 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 96% | 44,208 psi | 69% | 2979 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 53,098 psi | 83% | 3081 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,599 psi | 70% | 2966 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 47,282 psi | 74% | 2989 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 51,503 psi | 81% | 3084 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 50,546 psi | 79% | 3068 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,711 psi | 61% | 2805 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 41,307 psi | 65% | 3018 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 43,918 psi | 69% | 2982 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 43% | 1791 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,795 psi | 84% | 3061 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,524 psi | 65% | 2848 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,326 psi | 74% | 2959 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 40,857 psi | 64% | 2861 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 49,705 psi | 78% | 3015 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 92% | 46,064 psi | 72% | 3045 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 54,128 psi | 85% | 3051 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,904 psi | 70% | 2904 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 43,236 psi | 68% | 2884 fps | 97.5% |
| Lovex S071 | <<locked>> | 88% | 35,505 psi | 56% | 2723 fps | 95.9% |
| Norma 204 | <<locked>> | 82% | 44,382 psi | 70% | 2946 fps | 95.7% |
| Norma MRP | 79.8 gr | 84% | 38,247 psi | 60% | 2890 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 42,206 psi | 66% | 2907 fps | 99% |
| Ramshot Grand | <<locked>> | 92% | 46,166 psi | 72% | 3058 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 41,118 psi | 64% | 2894 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 92% | 41,249 psi | 65% | 2923 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 44% | 1837 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,750 psi | 83% | 3061 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,357 psi | 79% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,801 psi | 67% | 2936 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,191 psi | 65% | 2946 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 38,203 psi | 60% | 2923 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 49,806 psi | 78% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,469 psi | 71% | 2940 fps | 95% |
| Rottweil R 905 | <<locked>> | 86% | 43,076 psi | 68% | 2936 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 46,079 psi | 72% | 2930 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,904 psi | 70% | 2904 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 54,128 psi | 85% | 3051 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,236 psi | 68% | 2884 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,213 psi | 80% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,343 psi | 79% | 2894 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,092 psi | 69% | 2848 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 42,699 psi | 67% | 2930 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 49,777 psi | 78% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,676 psi | 78% | 2986 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 38,957 psi | 61% | 2861 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 38,174 psi | 60% | 2792 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 47,645 psi | 75% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,642 psi | 68% | 2907 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 40,408 psi | 63% | 2831 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 43,105 psi | 68% | 2904 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 34,200 psi | 54% | 2743 fps | 97.6% |
| Vihtavuori N560 | 87.4 gr | 92% | 50,908 psi | 80% | 3153 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 96% | 47,311 psi | 74% | 3061 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,844 psi | 67% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,773 psi | 70% | 2969 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,137 psi | 43% | 2635 fps | 96.8% |
| Winchester Supreme 780 | <<locked>> | 88% | 43,047 psi | 67% | 2897 fps | 95.5% |
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 83 powders for .300 Norma Mag. loaded with the .308 | 155gr | Frontier RSBT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,333 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,333 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 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 155.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Vihtavuori N560, ADI AR 2213 rank at the top here: for .300 Norma Mag. with the .308 | 155gr | Frontier RSBT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, Norma 217, ReloadSwiss RS 80 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.