Load Specifications
Load data in caliber .300 Norma Mag. with .308 | 166gr | Peregrine Glider GRM bullet and 84 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Ramshot Grand, Accurate High Country and Accurate MAGPRO.
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>> | 98% | 57,580 psi | 90% | 3068 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,159 psi | 90% | 2986 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,288 psi | 87% | 3054 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 55,361 psi | 87% | 3163 fps | 98% |
| Accurate MAGPRO | <<locked>> | 96% | 56,492 psi | 89% | 3163 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 84% | 57,232 psi | 90% | 3025 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,594 psi | 89% | 3114 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 54,230 psi | 85% | 3107 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,842 psi | 62% | 2861 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,623 psi | 89% | 3104 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,623 psi | 89% | 3104 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,665 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,463 psi | 88% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 53,838 psi | 84% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,883 psi | 88% | 3097 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,740 psi | 90% | 3166 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,824 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,546 psi | 79% | 3074 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,172 psi | 86% | 3169 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3143 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 55,651 psi | 87% | 3012 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,456 psi | 73% | 2992 fps | 96.5% |
| Bofors RP5 | <<locked>> | 98% | 57,740 psi | 90% | 3166 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 54,839 psi | 86% | 3002 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,806 psi | 78% | 3015 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 82% | 55,738 psi | 87% | 3031 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,479 psi | 90% | 3114 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 56,768 psi | 89% | 3071 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 54,346 psi | 85% | 3048 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,956 psi | 89% | 3091 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,724 psi | 89% | 3035 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,414 psi | 77% | 3123 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 86% | 54,085 psi | 85% | 3087 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,738 psi | 58% | 1923 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,579 psi | 89% | 3005 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,304 psi | 88% | 3041 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,536 psi | 89% | 3031 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 55,753 psi | 87% | 3048 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,564 psi | 87% | 3031 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 98% | 55,637 psi | 87% | 3143 fps | 98% |
| Lovex S062 | <<locked>> | 82% | 56,695 psi | 89% | 2995 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,681 psi | 89% | 3025 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,853 psi | 86% | 3018 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,082 psi | 80% | 2966 fps | 99.6% |
| Norma 203B | <<locked>> | 82% | 57,725 psi | 90% | 3058 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,406 psi | 90% | 3100 fps | 98.9% |
| Norma MRP | <<locked>> | 96% | 57,493 psi | 90% | 3189 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 57,682 psi | 90% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,391 psi | 88% | 3166 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 56,608 psi | 89% | 3100 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,505 psi | 85% | 3094 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 59% | 1969 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,724 psi | 87% | 3018 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,319 psi | 90% | 3123 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,550 psi | 87% | 3081 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 53,867 psi | 84% | 3107 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,980 psi | 78% | 3123 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 84% | 55,695 psi | 87% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,360 psi | 85% | 3022 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 94% | 55,274 psi | 87% | 3084 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 54,839 psi | 86% | 3002 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,681 psi | 89% | 3025 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,695 psi | 89% | 2995 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,853 psi | 86% | 3018 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,595 psi | 90% | 3071 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,101 psi | 88% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,289 psi | 88% | 2979 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,824 psi | 86% | 3077 fps | 98.8% |
| Somchem S355 | <<locked>> | 84% | 55,521 psi | 87% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,883 psi | 88% | 3012 fps | 97.2% |
| Somchem S365 | <<locked>> | 90% | 53,983 psi | 85% | 3041 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,738 psi | 87% | 3054 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 86% | 56,855 psi | 89% | 2976 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,970 psi | 88% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,303 psi | 87% | 3031 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 82% | 57,522 psi | 90% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,158 psi | 86% | 3038 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,869 psi | 89% | 3107 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,479 psi | 90% | 3182 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,895 psi | 83% | 3081 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,622 psi | 87% | 2992 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,696 psi | 90% | 3117 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3215 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,028 psi | 88% | 3051 fps | 98.8% |
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% | 32,953 psi | 52% | 2585 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 53,621 psi | 84% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,684 psi | 65% | 2808 fps | 99.3% |
| Accurate High Country | 80 gr | 88% | 44,585 psi | 70% | 2956 fps | 95.4% |
| Accurate MAGPRO | 85.2 gr | 92% | 48,675 psi | 76% | 3022 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 50,444 psi | 79% | 2917 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,263 psi | 63% | 2792 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 92% | 47,268 psi | 74% | 2972 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 98% | 37,376 psi | 59% | 2799 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 40,538 psi | 64% | 2792 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 40,538 psi | 64% | 2792 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,300 psi | 80% | 2940 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,364 psi | 63% | 2822 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,470 psi | 73% | 2953 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,132 psi | 63% | 2785 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,741 psi | 64% | 2841 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,602 psi | 46% | 2556 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,676 psi | 50% | 2631 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,155 psi | 50% | 2684 fps | 96.5% |
| Bofors RP15 | <<locked>> | 90% | 40,364 psi | 63% | 2831 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 51,953 psi | 81% | 2953 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,207 psi | 68% | 2923 fps | 95.5% |
| Bofors RP5 | <<locked>> | 88% | 40,741 psi | 64% | 2841 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 45,121 psi | 71% | 2825 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 96% | 43,337 psi | 68% | 2884 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 52,069 psi | 82% | 2969 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,859 psi | 69% | 2864 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 46,601 psi | 73% | 2887 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 90% | 47,195 psi | 74% | 2913 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,647 psi | 78% | 2963 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,971 psi | 60% | 2703 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,379 psi | 63% | 2913 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 43,047 psi | 67% | 2881 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 43% | 1719 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,084 psi | 83% | 2953 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,872 psi | 64% | 2749 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,717 psi | 73% | 2858 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 40,001 psi | 63% | 2756 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 88% | 45,861 psi | 72% | 2854 fps | 95% |
| IMR 7828 SSC | <<locked>> | 92% | 45,107 psi | 71% | 2940 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 53,229 psi | 83% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,048 psi | 69% | 2802 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 42,366 psi | 66% | 2785 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 32,126 psi | 50% | 2562 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 53,998 psi | 85% | 2999 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,567 psi | 64% | 2779 fps | 95.1% |
| Norma MRP | <<locked>> | 84% | 37,217 psi | 58% | 2785 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 41,379 psi | 65% | 2805 fps | 99.2% |
| Ramshot Grand | 83 gr | 92% | 45,107 psi | 71% | 2953 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 40,219 psi | 63% | 2789 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 90% | 37,231 psi | 58% | 2746 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 44% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,953 psi | 81% | 2953 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,371 psi | 77% | 3002 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,829 psi | 66% | 2831 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,335 psi | 63% | 2844 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,130 psi | 58% | 2822 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 48,892 psi | 77% | 2897 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,614 psi | 70% | 2838 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 39,363 psi | 62% | 2769 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 45,121 psi | 71% | 2825 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,048 psi | 69% | 2802 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 53,229 psi | 83% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,366 psi | 66% | 2785 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,357 psi | 79% | 2956 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,487 psi | 78% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,163 psi | 68% | 2743 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,756 psi | 65% | 2828 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 48,863 psi | 77% | 2894 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,834 psi | 77% | 2887 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 38,116 psi | 60% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,318 psi | 58% | 2690 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 46,833 psi | 73% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,757 psi | 67% | 2802 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 39,450 psi | 62% | 2733 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 53,896 psi | 84% | 2917 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,090 psi | 66% | 2802 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 33,170 psi | 52% | 2638 fps | 97.8% |
| Vihtavuori N560 | <<locked>> | 90% | 46,557 psi | 73% | 2979 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 96% | 46,093 psi | 72% | 2953 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,872 psi | 66% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,859 psi | 69% | 2864 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,121 psi | 41% | 2533 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,221 psi | 66% | 2799 fps | 95.9% |
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 84 powders for .300 Norma Mag. loaded with the .308 | 166gr | Peregrine Glider GRM. Winchester StaBALL HD delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,215 fps. ADI AR 2225 gives the best case fill at 100 %, and 84 of the 84 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 166.0 gr projectile in 0.308" calls for a 1:10.0 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. Ramshot Grand, Accurate High Country, Accurate MAGPRO rank at the top here: for .300 Norma Mag. with the .308 | 166gr | Peregrine Glider GRM 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.