Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Hornady SST InterLock 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 Accurate High Country.
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% | 54,012 psi | 85% | 2871 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 55,579 psi | 87% | 2913 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 55,332 psi | 87% | 3018 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 96% | 56,057 psi | 88% | 3015 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 84% | 57,188 psi | 90% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,507 psi | 89% | 2963 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 54,027 psi | 85% | 2959 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,001 psi | 63% | 2736 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,652 psi | 89% | 2959 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,897 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,463 psi | 88% | 2969 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,725 psi | 90% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,912 psi | 88% | 2949 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,305 psi | 90% | 3015 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,694 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,531 psi | 79% | 2933 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,766 psi | 86% | 3022 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,202 psi | 88% | 2995 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 55,898 psi | 88% | 2864 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,354 psi | 73% | 2854 fps | 96.7% |
| Bofors RP5 | <<locked>> | 98% | 57,305 psi | 90% | 3015 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 54,940 psi | 86% | 2858 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,792 psi | 78% | 2877 fps | 97.7% |
| Hodgdon H380 | <<locked>> | 82% | 55,941 psi | 88% | 2884 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,522 psi | 90% | 2966 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 56,797 psi | 89% | 2923 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 54,186 psi | 85% | 2900 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,681 psi | 89% | 2940 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,637 psi | 89% | 2887 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2982 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 86% | 54,099 psi | 85% | 2943 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1811 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,782 psi | 89% | 2858 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,434 psi | 88% | 2897 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,536 psi | 89% | 2884 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 56,043 psi | 88% | 2904 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,579 psi | 87% | 2890 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 98% | 55,332 psi | 87% | 2992 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 57,101 psi | 89% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,985 psi | 89% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,085 psi | 86% | 2874 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 2831 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 57,334 psi | 90% | 2953 fps | 99% |
| Norma MRP | <<locked>> | 96% | 57,159 psi | 90% | 3038 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 54,230 psi | 85% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,014 psi | 88% | 3015 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 56,565 psi | 89% | 2953 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,259 psi | 85% | 2949 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,507 psi | 59% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,854 psi | 88% | 2871 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,145 psi | 90% | 2972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,506 psi | 87% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 53,896 psi | 84% | 2963 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,661 psi | 78% | 2979 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 56,159 psi | 88% | 2864 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,259 psi | 85% | 2874 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 94% | 55,274 psi | 87% | 2936 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 54,940 psi | 86% | 2858 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,985 psi | 89% | 2884 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,101 psi | 89% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,085 psi | 86% | 2874 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,609 psi | 90% | 2923 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,289 psi | 88% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,449 psi | 88% | 2835 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,810 psi | 86% | 2933 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 55,796 psi | 87% | 2858 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,898 psi | 88% | 2867 fps | 97.4% |
| Somchem S365 | <<locked>> | 90% | 54,244 psi | 85% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,854 psi | 88% | 2913 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 57,203 psi | 90% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,985 psi | 88% | 2887 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,274 psi | 87% | 2890 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 57,682 psi | 90% | 2828 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,274 psi | 87% | 2894 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,130 psi | 90% | 2963 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,145 psi | 90% | 3031 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,939 psi | 83% | 2946 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,535 psi | 87% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 53,969 psi | 85% | 2910 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,216 psi | 87% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,767 psi | 87% | 2904 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>> | 80% | 31,401 psi | 49% | 2421 fps | 95.1% |
| Accurate 4350 | <<locked>> | 80% | 42,351 psi | 66% | 2687 fps | 99.5% |
| Accurate High Country | 73.9 gr | 88% | 44,788 psi | 70% | 2825 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 92% | 48,718 psi | 76% | 2884 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 50,633 psi | 79% | 2776 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,466 psi | 63% | 2664 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 90% | 44,135 psi | 69% | 2769 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 35,259 psi | 55% | 2615 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 40,814 psi | 64% | 2667 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,517 psi | 81% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,683 psi | 64% | 2690 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,615 psi | 73% | 2815 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,408 psi | 63% | 2661 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,406 psi | 60% | 2657 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,182 psi | 47% | 2454 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,126 psi | 50% | 2523 fps | 96.1% |
| Alliant Reloder-26 | 69.2 gr | 80% | 32,547 psi | 51% | 2572 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 40,669 psi | 64% | 2707 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 52,373 psi | 82% | 2815 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,323 psi | 68% | 2795 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 38,406 psi | 60% | 2657 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 45,585 psi | 71% | 2694 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 43,352 psi | 68% | 2749 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 52,489 psi | 82% | 2831 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,121 psi | 69% | 2733 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 46,818 psi | 73% | 2749 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 47,239 psi | 74% | 2779 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,296 psi | 73% | 2762 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,334 psi | 60% | 2579 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,058 psi | 60% | 2723 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 43,236 psi | 68% | 2749 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 43% | 1617 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,301 psi | 84% | 2805 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,075 psi | 64% | 2621 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,905 psi | 74% | 2720 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 40,480 psi | 63% | 2635 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,064 psi | 72% | 2720 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 45,310 psi | 71% | 2808 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 53,592 psi | 84% | 2799 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,570 psi | 70% | 2671 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 42,830 psi | 67% | 2657 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 32,895 psi | 52% | 2461 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 40,857 psi | 64% | 2651 fps | 95.5% |
| Norma MRP | 68.9 gr | 82% | 35,056 psi | 55% | 2605 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 41,756 psi | 65% | 2677 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 42,134 psi | 66% | 2753 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 40,567 psi | 64% | 2664 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 90% | 37,565 psi | 59% | 2631 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 44% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,301 psi | 82% | 2815 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,472 psi | 78% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,221 psi | 66% | 2707 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,567 psi | 64% | 2713 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 34,925 psi | 55% | 2638 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 49,356 psi | 77% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,715 psi | 70% | 2703 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 39,653 psi | 62% | 2648 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 45,585 psi | 71% | 2694 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,570 psi | 70% | 2671 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 53,592 psi | 84% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,830 psi | 67% | 2657 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,589 psi | 79% | 2815 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,850 psi | 78% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,555 psi | 68% | 2618 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,291 psi | 62% | 2638 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 49,327 psi | 77% | 2756 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 45,745 psi | 72% | 2694 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 38,406 psi | 60% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,681 psi | 59% | 2572 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 47,166 psi | 74% | 2684 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,149 psi | 68% | 2671 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 37,159 psi | 58% | 2552 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 54,259 psi | 85% | 2779 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,583 psi | 67% | 2674 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 33,707 psi | 53% | 2526 fps | 98.3% |
| Vihtavuori N560 | <<locked>> | 90% | 46,557 psi | 73% | 2844 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 46,151 psi | 72% | 2822 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,163 psi | 66% | 2638 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,121 psi | 69% | 2733 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,745 psi | 42% | 2441 fps | 97.8% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,523 psi | 62% | 2612 fps | 95.3% |
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 | 180gr | Hornady SST InterLock. Winchester StaBALL HD delivers the highest muzzle velocity at 3,068 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,068 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 180.0 gr projectile in 0.308" calls for a 1:12.0 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, Accurate High Country rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Hornady SST InterLock 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.