Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 170gr | Lapua Lock Base bullet and 83 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate MAGPRO and Norma MRP.
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% | 57,014 psi | 89% | 2933 fps | 99.2% |
| Accurate 3100 | <<locked>> | 98% | 56,710 psi | 89% | 2989 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 56,927 psi | 89% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,505 psi | 85% | 2976 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,013 psi | 86% | 3074 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 56,449 psi | 88% | 2946 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,288 psi | 87% | 3022 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 56,710 psi | 89% | 3077 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,320 psi | 62% | 2785 fps | 96.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,637 psi | 87% | 3022 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,624 psi | 90% | 2969 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,725 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,230 psi | 87% | 3035 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,550 psi | 89% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,911 psi | 86% | 3012 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,173 psi | 88% | 3074 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3051 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,487 psi | 78% | 2992 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 53,621 psi | 84% | 3084 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 3054 fps | 98.5% |
| Bofors RP3 | <<locked>> | 82% | 54,940 psi | 86% | 2933 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 56,173 psi | 88% | 3074 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 57,711 psi | 90% | 2979 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,762 psi | 76% | 2930 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 82% | 55,042 psi | 86% | 2949 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,478 psi | 89% | 3028 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 55,709 psi | 87% | 2986 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 96% | 56,913 psi | 89% | 3018 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,782 psi | 87% | 3002 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,564 psi | 87% | 2956 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,428 psi | 76% | 3035 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 88% | 56,971 psi | 89% | 3068 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,738 psi | 58% | 1870 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,869 psi | 88% | 2930 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,492 psi | 87% | 2963 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,637 psi | 87% | 2949 fps | 99.4% |
| IMR 4831 | <<locked>> | 90% | 54,998 psi | 86% | 2969 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,520 psi | 85% | 2946 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 98% | 54,317 psi | 85% | 3051 fps | 97.4% |
| Lovex S062 | <<locked>> | 82% | 56,159 psi | 88% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,956 psi | 88% | 2946 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 57,696 psi | 90% | 2995 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,299 psi | 79% | 2887 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 57,014 psi | 89% | 2979 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,362 psi | 88% | 3012 fps | 98.5% |
| Norma MRP | <<locked>> | 96% | 56,188 psi | 88% | 3104 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 56,797 psi | 89% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,955 psi | 86% | 3074 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 90% | 55,579 psi | 87% | 3015 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,040 psi | 83% | 3005 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,405 psi | 59% | 1913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,926 psi | 86% | 2936 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,014 psi | 88% | 3045 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,476 psi | 85% | 2999 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,565 psi | 89% | 3084 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,733 psi | 76% | 3031 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 84% | 55,259 psi | 87% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,913 psi | 89% | 2995 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 94% | 54,259 psi | 85% | 2999 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 57,711 psi | 90% | 2979 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,956 psi | 88% | 2946 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 56,159 psi | 88% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,696 psi | 90% | 2995 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,739 psi | 89% | 2992 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,434 psi | 87% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,579 psi | 87% | 2900 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,392 psi | 90% | 3051 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 54,969 psi | 86% | 2927 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,027 psi | 86% | 2927 fps | 96.7% |
| Somchem S365 | <<locked>> | 92% | 56,681 psi | 89% | 3018 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,824 psi | 86% | 2972 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 86% | 56,246 psi | 88% | 2900 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,027 psi | 86% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,302 psi | 85% | 2949 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 56,840 psi | 89% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,259 psi | 85% | 2956 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,956 psi | 88% | 3028 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,159 psi | 88% | 3094 fps | 97.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,837 psi | 81% | 2999 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,520 psi | 85% | 2913 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,695 psi | 89% | 3031 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,708 psi | 84% | 3130 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,795 psi | 86% | 2966 fps | 98.4% |
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% | 53,447 psi | 84% | 2874 fps | 98.8% |
| Accurate 3100 | <<locked>> | 82% | 32,909 psi | 52% | 2526 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 53,476 psi | 84% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,408 psi | 65% | 2740 fps | 99.1% |
| Accurate MAGPRO | 82.5 gr | 94% | 51,343 psi | 80% | 3009 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 49,879 psi | 78% | 2841 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,540 psi | 67% | 2782 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 92% | 46,311 psi | 73% | 2887 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 36,825 psi | 58% | 2717 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 42,859 psi | 67% | 2782 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,691 psi | 79% | 2864 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,070 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,914 psi | 63% | 2749 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,658 psi | 72% | 2874 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,395 psi | 66% | 2776 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,176 psi | 63% | 2766 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,544 psi | 46% | 2497 fps | 97.5% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,475 psi | 52% | 2625 fps | 96% |
| Alliant Reloder-26 | 71 gr | 80% | 31,879 psi | 50% | 2618 fps | 96.1% |
| Bofors RP15 | <<locked>> | 92% | 42,453 psi | 67% | 2815 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 51,387 psi | 81% | 2877 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 40,176 psi | 63% | 2766 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 44,875 psi | 70% | 2753 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 98% | 45,672 psi | 72% | 2867 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 51,503 psi | 81% | 2894 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 43,192 psi | 68% | 2789 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 80% | 45,948 psi | 72% | 2808 fps | 97% |
| Hodgdon H4831 | <<locked>> | 92% | 49,603 psi | 78% | 2894 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 48,573 psi | 76% | 2874 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,594 psi | 59% | 2638 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 94% | 39,769 psi | 62% | 2831 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 42,351 psi | 66% | 2802 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 43% | 1670 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,489 psi | 82% | 2874 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,466 psi | 63% | 2677 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,166 psi | 72% | 2782 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 39,668 psi | 62% | 2690 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,225 psi | 76% | 2835 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 94% | 47,485 psi | 74% | 2923 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 52,794 psi | 83% | 2867 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,830 psi | 69% | 2730 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 42,076 psi | 66% | 2713 fps | 97.4% |
| Lovex S071 | <<locked>> | 88% | 34,287 psi | 54% | 2559 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 53,403 psi | 84% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 82% | 42,975 psi | 67% | 2769 fps | 95.6% |
| Norma MRP | 72.3 gr | 84% | 36,680 psi | 57% | 2713 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 40,944 psi | 64% | 2730 fps | 99% |
| Ramshot Grand | <<locked>> | 92% | 44,324 psi | 69% | 2871 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 39,842 psi | 62% | 2720 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 39,407 psi | 62% | 2740 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 44% | 1713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,459 psi | 81% | 2877 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,457 psi | 76% | 2927 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,336 psi | 65% | 2759 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,711 psi | 62% | 2766 fps | 98.5% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,608 psi | 57% | 2743 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 48,472 psi | 76% | 2825 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 46,949 psi | 74% | 2818 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 41,495 psi | 65% | 2756 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 44,875 psi | 70% | 2753 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,830 psi | 69% | 2730 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 52,794 psi | 83% | 2867 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,076 psi | 66% | 2713 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,748 psi | 78% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,052 psi | 77% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,917 psi | 67% | 2674 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,133 psi | 64% | 2749 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 48,530 psi | 76% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,037 psi | 75% | 2808 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 37,652 psi | 59% | 2690 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 39,537 psi | 62% | 2680 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 46,369 psi | 73% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,337 psi | 66% | 2730 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 38,928 psi | 61% | 2661 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 53,301 psi | 84% | 2844 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,684 psi | 65% | 2730 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 32,909 psi | 52% | 2575 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 92% | 48,805 psi | 76% | 2959 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 48,385 psi | 76% | 2936 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,336 psi | 65% | 2694 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,337 psi | 68% | 2792 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,179 psi | 41% | 2474 fps | 96.7% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,539 psi | 65% | 2723 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 83 powders for .300 Weath. Mag. loaded with the .308 | 170gr | Lapua Lock Base. Winchester StaBALL HD delivers the highest muzzle velocity at 3,130 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,130 fps. ADI AR 2225 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 58–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, 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. Alliant Reloder-26, Accurate MAGPRO, Norma MRP rank at the top here: for .300 Weath. Mag. with the .308 | 170gr | Lapua Lock Base 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.