Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 170gr | Winchester FN Silv.Tip 30-30 bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and ADI AR 2213.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 55,288 psi | 87% | 2972 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 56,927 psi | 89% | 3018 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,740 psi | 90% | 3127 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 54,766 psi | 86% | 2930 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,711 psi | 90% | 3068 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 55,274 psi | 87% | 3064 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,089 psi | 64% | 2835 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,956 psi | 88% | 2953 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,667 psi | 90% | 3074 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,187 psi | 86% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,043 psi | 89% | 3054 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,071 psi | 86% | 3061 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,014 psi | 88% | 3041 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,822 psi | 81% | 3038 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,739 psi | 89% | 3133 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,638 psi | 90% | 3100 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 57,000 psi | 89% | 2969 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,863 psi | 75% | 2959 fps | 96.8% |
| Bofors RP5 | <<locked>> | 96% | 55,071 psi | 86% | 3061 fps | 98.8% |
| Bofors RP7 | <<locked>> | 86% | 55,956 psi | 88% | 2963 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,039 psi | 80% | 2982 fps | 97.7% |
| Hodgdon H380 | <<locked>> | 82% | 57,130 psi | 90% | 2992 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,984 psi | 86% | 3012 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 84% | 54,143 psi | 85% | 2966 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 94% | 55,347 psi | 87% | 3005 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,288 psi | 85% | 2986 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,389 psi | 85% | 2943 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,691 psi | 79% | 3091 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 86% | 55,376 psi | 87% | 3048 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 58% | 1886 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,638 psi | 90% | 2963 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,464 psi | 90% | 3002 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,508 psi | 90% | 2989 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 57,188 psi | 90% | 3009 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,623 psi | 89% | 2992 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 98% | 56,797 psi | 89% | 3104 fps | 98.1% |
| Lovex S065 | <<locked>> | 86% | 54,607 psi | 86% | 2933 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 56,130 psi | 88% | 2979 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,736 psi | 83% | 2933 fps | 99.7% |
| Norma 204 | <<locked>> | 88% | 54,679 psi | 86% | 2995 fps | 98.4% |
| Norma MRP | <<locked>> | 94% | 54,839 psi | 86% | 3084 fps | 99.6% |
| Norma URP | <<locked>> | 88% | 55,390 psi | 87% | 3002 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,725 psi | 90% | 3127 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 88% | 54,056 psi | 85% | 2999 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,869 psi | 88% | 3058 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,826 psi | 89% | 2972 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,578 psi | 86% | 3022 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,942 psi | 89% | 3038 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,129 psi | 86% | 3068 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,329 psi | 80% | 3091 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 57,246 psi | 90% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,390 psi | 87% | 2979 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 94% | 56,565 psi | 89% | 3045 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 55,956 psi | 88% | 2963 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,607 psi | 86% | 2933 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 88% | 56,130 psi | 88% | 2979 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,998 psi | 86% | 2972 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,363 psi | 90% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,566 psi | 90% | 2940 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,101 psi | 88% | 3038 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 56,869 psi | 89% | 2963 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,203 psi | 90% | 2972 fps | 97.4% |
| Somchem S365 | <<locked>> | 90% | 55,477 psi | 87% | 3005 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,159 psi | 90% | 3018 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 54,679 psi | 86% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,261 psi | 90% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,724 psi | 89% | 2995 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 88% | 56,318 psi | 88% | 2995 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,969 psi | 86% | 3018 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,810 psi | 86% | 3077 fps | 97.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 3051 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,797 psi | 89% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,201 psi | 87% | 3015 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,479 psi | 90% | 3179 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,232 psi | 90% | 3012 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% | 32,111 psi | 50% | 2507 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 43,221 psi | 68% | 2779 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 50,183 psi | 79% | 2992 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 51,401 psi | 81% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 41,423 psi | 65% | 2762 fps | 95.4% |
| ADI AR 2213 | 77.9 gr | 90% | 45,121 psi | 71% | 2871 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 36,158 psi | 57% | 2707 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,504 psi | 82% | 2900 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,452 psi | 65% | 2789 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,863 psi | 75% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 41,394 psi | 65% | 2759 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 42,061 psi | 66% | 2812 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,806 psi | 48% | 2536 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,808 psi | 51% | 2612 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,475 psi | 52% | 2664 fps | 97% |
| Bofors RP15 | <<locked>> | 90% | 41,669 psi | 65% | 2802 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 53,417 psi | 84% | 2917 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 44,715 psi | 70% | 2897 fps | 95.9% |
| Bofors RP5 | <<locked>> | 88% | 42,061 psi | 66% | 2812 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 46,427 psi | 73% | 2789 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 44,396 psi | 70% | 2848 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 53,388 psi | 84% | 2933 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,976 psi | 70% | 2828 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 47,703 psi | 75% | 2851 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 48,283 psi | 76% | 2877 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,355 psi | 74% | 2861 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,160 psi | 61% | 2674 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,870 psi | 61% | 2815 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 44,338 psi | 69% | 2848 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 43% | 1686 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,099 psi | 85% | 2910 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,959 psi | 66% | 2717 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,703 psi | 75% | 2818 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 41,307 psi | 65% | 2726 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,949 psi | 74% | 2818 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 46,441 psi | 73% | 2910 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 45,237 psi | 71% | 2766 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 43,627 psi | 68% | 2749 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 33,663 psi | 53% | 2546 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 41,742 psi | 65% | 2749 fps | 95.4% |
| Norma MRP | 73.3 gr | 82% | 35,868 psi | 56% | 2694 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 42,627 psi | 67% | 2772 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 43,192 psi | 68% | 2851 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 41,495 psi | 65% | 2759 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 38,537 psi | 60% | 2723 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,123 psi | 44% | 1726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,214 psi | 83% | 2917 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,763 psi | 80% | 2966 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,120 psi | 68% | 2802 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,466 psi | 65% | 2812 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,853 psi | 56% | 2730 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 50,299 psi | 79% | 2861 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,643 psi | 72% | 2802 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 40,553 psi | 64% | 2740 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 46,427 psi | 73% | 2789 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,237 psi | 71% | 2766 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 43,627 psi | 68% | 2749 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,605 psi | 81% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,633 psi | 79% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,367 psi | 70% | 2713 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,205 psi | 63% | 2733 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 50,111 psi | 79% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,789 psi | 73% | 2792 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 39,436 psi | 62% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 38,537 psi | 60% | 2664 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 48,037 psi | 75% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,947 psi | 69% | 2766 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 38,130 psi | 60% | 2648 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 43,395 psi | 68% | 2769 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 34,577 psi | 54% | 2618 fps | 98.2% |
| Vihtavuori N560 | 80.5 gr | 90% | 47,819 psi | 75% | 2946 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 47,500 psi | 74% | 2923 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,149 psi | 68% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,121 psi | 71% | 2831 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,383 psi | 43% | 2526 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,509 psi | 63% | 2707 fps | 95.2% |
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 83 powders for .300 Weath. Mag. loaded with the .308 | 170gr | Winchester FN Silv.Tip 30-30. Winchester StaBALL HD delivers the highest muzzle velocity at 3,179 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,179 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 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 170.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Vihtavuori N560, ADI AR 2213 rank at the top here: for .300 Weath. Mag. with the .308 | 170gr | Winchester FN Silv.Tip 30-30 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, ReloadSwiss RS 80, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.