Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 166gr | Hammer Stone Hammer bullet and 80 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Winchester StaBALL HD.
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 3100 | <<locked>> | 96% | 54,447 psi | 85% | 3022 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 55,898 psi | 88% | 3064 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,072 psi | 88% | 3173 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 96% | 57,174 psi | 90% | 3176 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 84% | 57,551 psi | 90% | 3031 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,029 psi | 89% | 3120 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 54,868 psi | 86% | 3117 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,451 psi | 63% | 2877 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,319 psi | 90% | 3117 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,245 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,029 psi | 89% | 3127 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,404 psi | 85% | 3084 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,521 psi | 89% | 3107 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,505 psi | 85% | 3114 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,317 psi | 87% | 3091 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,184 psi | 80% | 3087 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,956 psi | 88% | 3179 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3153 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 56,014 psi | 88% | 3018 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,079 psi | 74% | 3002 fps | 96.7% |
| Bofors RP5 | <<locked>> | 96% | 54,505 psi | 85% | 3114 fps | 98.8% |
| Bofors RP7 | <<locked>> | 86% | 55,347 psi | 87% | 3012 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,343 psi | 79% | 3028 fps | 97.7% |
| Hodgdon H380 | <<locked>> | 82% | 56,260 psi | 88% | 3038 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,215 psi | 85% | 3061 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 57,261 psi | 90% | 3081 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 54,752 psi | 86% | 3054 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,609 psi | 90% | 3100 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,305 psi | 90% | 3045 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,183 psi | 79% | 3143 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 86% | 54,766 psi | 86% | 3100 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 57% | 1926 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,942 psi | 89% | 3015 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,768 psi | 89% | 3051 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,014 psi | 89% | 3041 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 56,463 psi | 88% | 3058 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,956 psi | 88% | 3041 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 98% | 56,260 psi | 88% | 3156 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 57,290 psi | 90% | 3005 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,174 psi | 90% | 3035 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,332 psi | 87% | 3028 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,735 psi | 81% | 2979 fps | 99.7% |
| Norma 204 | <<locked>> | 88% | 54,041 psi | 85% | 3045 fps | 98.4% |
| Norma MRP | <<locked>> | 94% | 54,230 psi | 85% | 3136 fps | 99.6% |
| Norma URP | <<locked>> | 88% | 54,621 psi | 86% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,043 psi | 89% | 3179 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 57,305 psi | 90% | 3110 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,143 psi | 86% | 3104 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1972 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,999 psi | 88% | 3022 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 53,940 psi | 85% | 3074 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,086 psi | 88% | 3087 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,607 psi | 86% | 3120 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,676 psi | 79% | 3136 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 56,304 psi | 88% | 3015 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,781 psi | 86% | 3028 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 94% | 55,956 psi | 88% | 3094 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 55,347 psi | 87% | 3012 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,174 psi | 90% | 3035 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,290 psi | 90% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,332 psi | 87% | 3028 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,404 psi | 85% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,666 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,739 psi | 89% | 2986 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,506 psi | 87% | 3091 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 56,086 psi | 88% | 3012 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,434 psi | 88% | 3022 fps | 97.4% |
| Somchem S365 | <<locked>> | 90% | 54,563 psi | 86% | 3051 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,391 psi | 88% | 3068 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 86% | 57,392 psi | 90% | 2982 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,492 psi | 89% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,941 psi | 88% | 3041 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 88% | 55,637 psi | 87% | 3048 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,624 psi | 90% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,230 psi | 85% | 3127 fps | 97.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,708 psi | 84% | 3097 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,289 psi | 88% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,418 psi | 85% | 3064 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,594 psi | 89% | 3225 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,666 psi | 89% | 3064 fps | 98.9% |
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% | 33,257 psi | 52% | 2592 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 42,250 psi | 66% | 2822 fps | 99.4% |
| Accurate High Country | <<locked>> | 88% | 45,223 psi | 71% | 2969 fps | 95.7% |
| Accurate MAGPRO | 86 gr | 92% | 49,313 psi | 77% | 3035 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 50,778 psi | 80% | 2923 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,683 psi | 64% | 2805 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 90% | 44,469 psi | 70% | 2913 fps | 95% |
| ADI AR 2225 | <<locked>> | 96% | 35,360 psi | 55% | 2740 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,002 psi | 64% | 2805 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,692 psi | 81% | 2946 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,712 psi | 64% | 2831 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,036 psi | 74% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,596 psi | 64% | 2799 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 41,350 psi | 65% | 2854 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,907 psi | 47% | 2562 fps | 97.9% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,908 psi | 50% | 2641 fps | 95.6% |
| Alliant Reloder-26 | 75.7 gr | 80% | 32,590 psi | 51% | 2694 fps | 96.7% |
| Bofors RP15 | <<locked>> | 90% | 40,799 psi | 64% | 2838 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 52,301 psi | 82% | 2959 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,816 psi | 69% | 2936 fps | 95.7% |
| Bofors RP5 | <<locked>> | 88% | 41,350 psi | 65% | 2854 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 45,629 psi | 72% | 2835 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 43,816 psi | 69% | 2897 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 52,620 psi | 82% | 2979 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,222 psi | 69% | 2871 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 46,920 psi | 74% | 2897 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 47,819 psi | 75% | 2927 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,717 psi | 73% | 2907 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,348 psi | 60% | 2713 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,218 psi | 60% | 2858 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 43,511 psi | 68% | 2890 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 43% | 1722 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,432 psi | 84% | 2959 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,176 psi | 65% | 2756 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,021 psi | 74% | 2864 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 40,335 psi | 63% | 2766 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,267 psi | 73% | 2861 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 92% | 45,701 psi | 72% | 2953 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 53,795 psi | 84% | 2953 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,382 psi | 70% | 2808 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 42,685 psi | 67% | 2792 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 32,430 psi | 51% | 2569 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 41,002 psi | 64% | 2789 fps | 95.3% |
| Norma MRP | <<locked>> | 84% | 37,652 psi | 59% | 2799 fps | 96% |
| Norma URP | <<locked>> | 80% | 41,742 psi | 65% | 2812 fps | 99.3% |
| Ramshot Grand | <<locked>> | 92% | 45,556 psi | 71% | 2963 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 40,712 psi | 64% | 2802 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 90% | 37,739 psi | 59% | 2759 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 44% | 1765 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,446 psi | 82% | 2963 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,995 psi | 78% | 3015 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,177 psi | 66% | 2841 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,770 psi | 64% | 2854 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,608 psi | 59% | 2838 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 49,269 psi | 77% | 2904 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,034 psi | 71% | 2848 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 39,682 psi | 62% | 2779 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 45,629 psi | 72% | 2835 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,382 psi | 70% | 2808 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 53,795 psi | 84% | 2953 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,685 psi | 67% | 2792 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,908 psi | 80% | 2966 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,053 psi | 78% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,468 psi | 68% | 2753 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,334 psi | 62% | 2772 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 49,255 psi | 77% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,371 psi | 77% | 2900 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 38,493 psi | 60% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,594 psi | 59% | 2700 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 47,195 psi | 74% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,265 psi | 68% | 2812 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 37,333 psi | 59% | 2684 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 42,583 psi | 67% | 2808 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 33,518 psi | 53% | 2648 fps | 97.9% |
| Vihtavuori N560 | <<locked>> | 90% | 46,978 psi | 74% | 2989 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 96% | 46,514 psi | 73% | 2963 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,308 psi | 66% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,353 psi | 70% | 2874 fps | 98% |
| Winchester StaBALL HD | 72.7 gr | 80% | 26,484 psi | 42% | 2546 fps | 97.2% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,697 psi | 62% | 2746 fps | 95.1% |
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 80 powders for .300 Norma Mag. loaded with the .308 | 166gr | Hammer Stone Hammer. Winchester StaBALL HD delivers the highest muzzle velocity at 3,225 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,225 fps. ADI AR 2225 gives the best case fill at 100 %, and 80 of the 80 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 166.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, 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. Accurate MAGPRO, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for .300 Norma Mag. with the .308 | 166gr | Hammer Stone Hammer 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.