Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 159gr | IBEX TRD bullet and 79 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 ReloadSwiss RS 70.
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% | 56,231 psi | 88% | 2979 fps | 98.5% |
| Accurate 3100 | <<locked>> | 98% | 55,680 psi | 87% | 3038 fps | 99.5% |
| Accurate 4064 | <<locked>> | 82% | 57,217 psi | 90% | 2982 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,522 psi | 90% | 3091 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,101 psi | 89% | 3173 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 84% | 55,521 psi | 87% | 3002 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,334 psi | 90% | 3120 fps | 98% |
| ADI AR 2213 | <<locked>> | 98% | 55,201 psi | 87% | 3114 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,637 psi | 89% | 3028 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,797 psi | 89% | 3048 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,087 psi | 89% | 3136 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,911 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,768 psi | 89% | 3107 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,592 psi | 86% | 3114 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,216 psi | 87% | 3104 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,283 psi | 76% | 3031 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,535 psi | 87% | 3192 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3097 fps | 97.5% |
| Bofors RP3 | <<locked>> | 82% | 54,534 psi | 85% | 2995 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 54,592 psi | 86% | 3114 fps | 97.8% |
| Bofors RP7 | <<locked>> | 88% | 56,811 psi | 89% | 3025 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 82% | 54,636 psi | 86% | 3009 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 88% | 55,245 psi | 87% | 3074 fps | 99% |
| Hodgdon H4350 | <<locked>> | 86% | 54,723 psi | 86% | 3031 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,288 psi | 85% | 3009 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,355 psi | 74% | 3064 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 88% | 55,187 psi | 86% | 3107 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 58% | 1916 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,955 psi | 86% | 2982 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,305 psi | 90% | 3015 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 57,580 psi | 90% | 3058 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,665 psi | 86% | 2995 fps | 98.8% |
| IMR 4831 | <<locked>> | 92% | 57,580 psi | 90% | 3077 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,710 psi | 89% | 3041 fps | 96.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3146 fps | 96.8% |
| Lovex S062 | <<locked>> | 82% | 55,840 psi | 88% | 2982 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,434 psi | 87% | 3002 fps | 99.6% |
| Lovex S070 | <<locked>> | 90% | 56,942 psi | 89% | 3048 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,995 psi | 78% | 2943 fps | 98.9% |
| Norma 203B | <<locked>> | 82% | 56,115 psi | 88% | 3035 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,955 psi | 86% | 3054 fps | 97.5% |
| Norma MRP | <<locked>> | 96% | 54,302 psi | 85% | 3143 fps | 98.9% |
| Norma URP | <<locked>> | 90% | 55,651 psi | 87% | 3068 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,768 psi | 89% | 3058 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3166 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 57,638 psi | 90% | 3117 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,474 psi | 81% | 3038 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,695 psi | 59% | 1959 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,551 psi | 90% | 3041 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,302 psi | 85% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,043 psi | 89% | 3110 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,810 psi | 86% | 3127 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,529 psi | 74% | 3061 fps | 98% |
| Rottweil R 903 | <<locked>> | 84% | 54,752 psi | 86% | 2995 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,593 psi | 87% | 3031 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 96% | 56,492 psi | 89% | 3100 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 88% | 56,811 psi | 89% | 3025 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,434 psi | 87% | 3002 fps | 99.6% |
| Shooters World Precision | <<locked>> | 82% | 55,840 psi | 88% | 2982 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,942 psi | 89% | 3048 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,492 psi | 87% | 3045 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,810 psi | 86% | 2871 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,926 psi | 86% | 2946 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,999 psi | 88% | 3094 fps | 98% |
| Somchem S355 | <<locked>> | 86% | 57,696 psi | 90% | 3038 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,334 psi | 90% | 3022 fps | 96.2% |
| Somchem S365 | <<locked>> | 92% | 55,100 psi | 86% | 3071 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,377 psi | 90% | 3077 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 86% | 55,535 psi | 87% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,406 psi | 90% | 3058 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,246 psi | 88% | 3045 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 82% | 56,275 psi | 88% | 2959 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,797 psi | 89% | 3064 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,752 psi | 86% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,418 psi | 85% | 3127 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,797 psi | 89% | 3018 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,463 psi | 87% | 3081 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,865 psi | 80% | 3179 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,985 psi | 89% | 3064 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% | 52,823 psi | 83% | 2920 fps | 97.9% |
| Accurate 3100 | <<locked>> | 84% | 35,795 psi | 56% | 2648 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 53,838 psi | 84% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,684 psi | 65% | 2805 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 96% | 53,374 psi | 84% | 3110 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 49,327 psi | 77% | 2894 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 44,788 psi | 70% | 2884 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 96% | 51,779 psi | 81% | 3048 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,343 psi | 79% | 2923 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,432 psi | 84% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,668 psi | 62% | 2802 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,976 psi | 70% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 44,425 psi | 70% | 2874 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 92% | 45,078 psi | 71% | 2933 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,066 psi | 47% | 2559 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 35,679 psi | 56% | 2733 fps | 95.8% |
| Alliant Reloder-26 | 68.8 gr | 80% | 32,198 psi | 50% | 2677 fps | 95.1% |
| Bofors RP15 | <<locked>> | 94% | 44,454 psi | 70% | 2917 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 51,227 psi | 80% | 2943 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 45,078 psi | 71% | 2933 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 44,918 psi | 70% | 2805 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 51,213 psi | 80% | 2949 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 42,859 psi | 67% | 2838 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 45,397 psi | 71% | 2854 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,362 psi | 59% | 2690 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 98% | 44,512 psi | 70% | 2999 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 41,814 psi | 66% | 2848 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 44% | 1716 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,909 psi | 81% | 2930 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,954 psi | 85% | 2956 fps | 98.7% |
| IMR 4350 | <<locked>> | 80% | 40,248 psi | 63% | 2723 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,818 psi | 72% | 2828 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 39,740 psi | 62% | 2749 fps | 98.3% |
| IMR 4955 Enduron | <<locked>> | 94% | 53,374 psi | 84% | 2986 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 96% | 49,647 psi | 78% | 3022 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 52,605 psi | 82% | 2933 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,859 psi | 69% | 2785 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 42,192 psi | 66% | 2769 fps | 96.6% |
| Lovex S071 | <<locked>> | 88% | 34,983 psi | 55% | 2628 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,823 psi | 83% | 2982 fps | 100% |
| Norma 204 | <<locked>> | 84% | 45,223 psi | 71% | 2871 fps | 95.2% |
| Norma MRP | 71.8 gr | 86% | 39,073 psi | 61% | 2825 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 40,712 psi | 64% | 2785 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 53,185 psi | 83% | 3002 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 49,690 psi | 78% | 3031 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 39,450 psi | 62% | 2769 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 94% | 41,814 psi | 66% | 2841 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,326 psi | 44% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,850 psi | 80% | 2927 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,543 psi | 75% | 2986 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,089 psi | 64% | 2815 fps | 98.2% |
| ReloadSwiss RS 70 | 68.2 gr | 80% | 39,479 psi | 62% | 2818 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 41,655 psi | 65% | 2923 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 48,399 psi | 76% | 2887 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 49,153 psi | 77% | 2917 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 88% | 43,859 psi | 69% | 2864 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 44,918 psi | 70% | 2805 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,859 psi | 69% | 2785 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 52,605 psi | 82% | 2933 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,192 psi | 66% | 2769 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,936 psi | 77% | 2936 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,776 psi | 76% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,076 psi | 68% | 2730 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 43,453 psi | 68% | 2858 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 48,312 psi | 76% | 2881 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,780 psi | 84% | 2963 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,463 psi | 59% | 2749 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 42,134 psi | 66% | 2792 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 46,137 psi | 72% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,047 psi | 66% | 2782 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 43,772 psi | 69% | 2818 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 52,852 psi | 83% | 2907 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,669 psi | 65% | 2785 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 33,504 psi | 53% | 2644 fps | 96.9% |
| Vihtavuori N560 | <<locked>> | 94% | 50,894 psi | 80% | 3061 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,973 psi | 64% | 2746 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 43,004 psi | 67% | 2841 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,035 psi | 42% | 2539 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 92% | 46,746 psi | 73% | 2884 fps | 95.8% |
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 79 powders for .300 Weath. Mag. loaded with the .308 | 159gr | IBEX TRD. Alliant Reloder-26 delivers the highest muzzle velocity at 3,192 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,192 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 79 of the 79 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 159.0 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, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 159gr | IBEX TRD 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.