Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 165gr | Remington SP Extended-Range BT bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP 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 3100 | <<locked>> | 96% | 53,882 psi | 84% | 2989 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 57,682 psi | 90% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,550 psi | 87% | 3038 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,202 psi | 88% | 3136 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 57,261 psi | 90% | 3005 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,376 psi | 88% | 3087 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 96% | 53,969 psi | 85% | 3077 fps | 97.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,030 psi | 63% | 2838 fps | 96.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,492 psi | 89% | 3081 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,824 psi | 86% | 2976 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,289 psi | 88% | 3097 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 53,809 psi | 84% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,753 psi | 87% | 3071 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,551 psi | 90% | 3140 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,520 psi | 85% | 3058 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,444 psi | 79% | 3051 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,013 psi | 86% | 3150 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3117 fps | 98.6% |
| Bofors RP3 | <<locked>> | 82% | 55,796 psi | 87% | 2995 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,456 psi | 73% | 2969 fps | 96% |
| Bofors RP5 | <<locked>> | 98% | 57,551 psi | 90% | 3140 fps | 98.9% |
| Bofors RP7 | <<locked>> | 86% | 54,882 psi | 86% | 2982 fps | 99% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,777 psi | 78% | 2989 fps | 97% |
| Hodgdon H380 | <<locked>> | 82% | 55,970 psi | 88% | 3012 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,522 psi | 90% | 3094 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 56,695 psi | 89% | 3048 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 94% | 54,056 psi | 85% | 3018 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,681 psi | 89% | 3061 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,550 psi | 89% | 3015 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,342 psi | 77% | 3097 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 86% | 53,983 psi | 85% | 3064 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 58% | 1913 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,565 psi | 89% | 2986 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,304 psi | 88% | 3022 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,434 psi | 88% | 3012 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 55,883 psi | 88% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,477 psi | 87% | 3009 fps | 97% |
| IMR 7828 SSC | <<locked>> | 98% | 55,376 psi | 87% | 3114 fps | 97.5% |
| Lovex S062 | <<locked>> | 82% | 56,869 psi | 89% | 2979 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,985 psi | 89% | 3009 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 54,969 psi | 86% | 2999 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 2949 fps | 99.5% |
| Norma 204 | <<locked>> | 90% | 57,261 psi | 90% | 3074 fps | 98.6% |
| Norma MRP | <<locked>> | 96% | 57,276 psi | 90% | 3163 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 57,725 psi | 90% | 3077 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,159 psi | 88% | 3140 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 56,507 psi | 89% | 3077 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,273 psi | 85% | 3068 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 59% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,724 psi | 87% | 2995 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,130 psi | 90% | 3104 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,550 psi | 87% | 3061 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,682 psi | 90% | 3146 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,893 psi | 78% | 3097 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 84% | 56,028 psi | 88% | 2992 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,215 psi | 85% | 2995 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 94% | 55,201 psi | 87% | 3058 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 86% | 54,882 psi | 86% | 2982 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,985 psi | 89% | 3009 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 56,869 psi | 89% | 2979 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,969 psi | 86% | 2999 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,551 psi | 90% | 3051 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,333 psi | 88% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,449 psi | 88% | 2959 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,752 psi | 86% | 3051 fps | 98.5% |
| Somchem S355 | <<locked>> | 84% | 55,724 psi | 87% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,985 psi | 88% | 2989 fps | 96.9% |
| Somchem S365 | <<locked>> | 90% | 54,056 psi | 85% | 3025 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,840 psi | 88% | 3031 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 86% | 57,116 psi | 90% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,999 psi | 88% | 3015 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,376 psi | 87% | 3012 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 57,725 psi | 90% | 2956 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,085 psi | 86% | 3015 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,956 psi | 89% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,246 psi | 90% | 3153 fps | 97.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,968 psi | 83% | 3061 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,521 psi | 87% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,522 psi | 90% | 3094 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,390 psi | 87% | 3199 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,869 psi | 88% | 3028 fps | 98.5% |
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% | 33,533 psi | 53% | 2575 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 54,099 psi | 85% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,134 psi | 66% | 2795 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 52,388 psi | 82% | 3068 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 50,444 psi | 79% | 2897 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 43,250 psi | 68% | 2838 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 47,239 psi | 74% | 2946 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 98% | 37,550 psi | 59% | 2772 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 43,555 psi | 68% | 2838 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,459 psi | 81% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,480 psi | 63% | 2802 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,630 psi | 73% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 43,091 psi | 68% | 2831 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,944 psi | 64% | 2822 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,008 psi | 47% | 2543 fps | 97.5% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,995 psi | 50% | 2615 fps | 95% |
| Alliant Reloder-26 | 73.7 gr | 80% | 32,518 psi | 51% | 2667 fps | 96.2% |
| Bofors RP15 | <<locked>> | 92% | 43,381 psi | 68% | 2874 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 52,272 psi | 82% | 2940 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,410 psi | 68% | 2904 fps | 95.1% |
| Bofors RP5 | <<locked>> | 88% | 40,944 psi | 64% | 2822 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 45,513 psi | 71% | 2808 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 96% | 43,308 psi | 68% | 2854 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 52,301 psi | 82% | 2953 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 43,932 psi | 69% | 2844 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 46,717 psi | 73% | 2867 fps | 97% |
| Hodgdon H4831 | <<locked>> | 92% | 50,589 psi | 79% | 2959 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,603 psi | 78% | 2936 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,203 psi | 60% | 2690 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,553 psi | 64% | 2890 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 43,178 psi | 68% | 2861 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 43% | 1709 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,084 psi | 83% | 2933 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,075 psi | 64% | 2733 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,804 psi | 73% | 2835 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 40,321 psi | 63% | 2743 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,921 psi | 77% | 2890 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 94% | 48,385 psi | 76% | 2986 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 53,577 psi | 84% | 2930 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,324 psi | 69% | 2782 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 42,714 psi | 67% | 2766 fps | 97.4% |
| Lovex S071 | <<locked>> | 88% | 34,925 psi | 55% | 2612 fps | 95.8% |
| Norma 204 | <<locked>> | 82% | 43,555 psi | 68% | 2822 fps | 95.6% |
| Norma MRP | 75.1 gr | 84% | 37,478 psi | 59% | 2769 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 41,626 psi | 65% | 2789 fps | 99% |
| Ramshot Grand | <<locked>> | 92% | 45,223 psi | 71% | 2930 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 40,509 psi | 63% | 2776 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 92% | 40,335 psi | 63% | 2799 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 44% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,170 psi | 82% | 2936 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,458 psi | 78% | 2986 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,018 psi | 66% | 2815 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,451 psi | 63% | 2825 fps | 98.5% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,362 psi | 59% | 2802 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 49,211 psi | 77% | 2884 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 47,645 psi | 75% | 2874 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 42,279 psi | 66% | 2812 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 45,513 psi | 71% | 2808 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,324 psi | 69% | 2782 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 53,577 psi | 84% | 2930 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,714 psi | 67% | 2766 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,502 psi | 79% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,705 psi | 78% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,482 psi | 68% | 2730 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,901 psi | 66% | 2805 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 49,095 psi | 77% | 2877 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,892 psi | 77% | 2864 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 38,348 psi | 60% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,608 psi | 59% | 2677 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 47,050 psi | 74% | 2802 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,946 psi | 67% | 2785 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 39,682 psi | 62% | 2717 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 54,056 psi | 85% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,409 psi | 66% | 2785 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 33,620 psi | 53% | 2628 fps | 97.6% |
| Vihtavuori N560 | 82.2 gr | 92% | 49,763 psi | 78% | 3022 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 96% | 46,166 psi | 72% | 2933 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,163 psi | 66% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,077 psi | 69% | 2848 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,658 psi | 42% | 2523 fps | 96.7% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,264 psi | 66% | 2779 fps | 95.4% |
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 81 powders for .300 Weath. Mag. loaded with the .308 | 165gr | Remington SP Extended-Range BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,199 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,199 fps. ADI AR 2225 gives the best case fill at 100 %, and 81 of the 81 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 165.0 gr projectile in 0.308" calls for a 1:6.0 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Weath. Mag. with the .308 | 165gr | Remington SP Extended-Range BT 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.