Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 165gr | RWS Speed Tip Professional bullet and 88 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 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.
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 2495 | <<locked>> | 82% | 57,348 psi | 90% | 2904 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,476 psi | 85% | 2920 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,913 psi | 89% | 3025 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 57,653 psi | 90% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,085 psi | 86% | 3018 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,361 psi | 87% | 3107 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 86% | 57,522 psi | 90% | 2995 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,028 psi | 88% | 3064 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3117 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,246 psi | 90% | 3123 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,955 psi | 86% | 2966 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,071 psi | 86% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,811 psi | 87% | 3081 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,334 psi | 90% | 3104 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,361 psi | 87% | 3051 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 3114 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,548 psi | 84% | 3038 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,441 psi | 73% | 2966 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,708 psi | 84% | 3123 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,953 psi | 81% | 3031 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 55,782 psi | 87% | 2982 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 3114 fps | 98.5% |
| Bofors RP7 | <<locked>> | 88% | 55,071 psi | 86% | 2966 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 56,202 psi | 88% | 2999 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,232 psi | 90% | 3074 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 56,768 psi | 89% | 3031 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 98% | 57,624 psi | 90% | 3058 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,434 psi | 88% | 3041 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,304 psi | 88% | 3002 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,406 psi | 90% | 3035 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,513 psi | 71% | 2995 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 88% | 53,650 psi | 84% | 3045 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 57% | 1880 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,826 psi | 89% | 2976 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,782 psi | 87% | 2956 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 56,188 psi | 88% | 3002 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,782 psi | 89% | 2999 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 55,434 psi | 87% | 3012 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,521 psi | 89% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,361 psi | 87% | 2989 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,868 psi | 86% | 3091 fps | 97% |
| Lovex S062 | <<locked>> | 84% | 57,276 psi | 90% | 2969 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,811 psi | 89% | 2989 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 54,824 psi | 86% | 2979 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,355 psi | 74% | 2871 fps | 98.8% |
| Norma 203B | <<locked>> | 82% | 54,404 psi | 85% | 2972 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,130 psi | 90% | 3054 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 56,231 psi | 88% | 3136 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 57,305 psi | 90% | 3058 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,216 psi | 87% | 2999 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,361 psi | 87% | 3107 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 92% | 56,101 psi | 88% | 3058 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,632 psi | 78% | 2976 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,318 psi | 58% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,941 psi | 88% | 2982 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,695 psi | 89% | 3094 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,100 psi | 86% | 3045 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,232 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,527 psi | 71% | 2992 fps | 98% |
| Rottweil R 902 | <<locked>> | 82% | 55,535 psi | 87% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,869 psi | 88% | 2979 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,566 psi | 90% | 3035 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 96% | 54,621 psi | 86% | 3035 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 55,071 psi | 86% | 2966 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,811 psi | 89% | 2989 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 57,276 psi | 90% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,824 psi | 86% | 2979 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,464 psi | 90% | 3038 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,507 psi | 89% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,652 psi | 89% | 2946 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,157 psi | 85% | 3028 fps | 98% |
| Somchem S355 | <<locked>> | 86% | 55,796 psi | 87% | 2972 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,709 psi | 87% | 2966 fps | 96.3% |
| Somchem S365 | <<locked>> | 94% | 57,000 psi | 89% | 3061 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,463 psi | 87% | 3015 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 56,043 psi | 88% | 2887 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,304 psi | 88% | 2904 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,087 psi | 89% | 2946 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,767 psi | 87% | 2999 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,592 psi | 86% | 2982 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 82% | 54,418 psi | 85% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,984 psi | 86% | 3002 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,086 psi | 88% | 3068 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,347 psi | 88% | 3127 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,419 psi | 87% | 2959 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,464 psi | 90% | 3077 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,008 psi | 77% | 3104 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,434 psi | 87% | 3005 fps | 98.1% |
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 2495 | <<locked>> | 80% | 53,679 psi | 84% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,155 psi | 80% | 2861 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 35,317 psi | 55% | 2615 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 50,865 psi | 80% | 2858 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,102 psi | 61% | 2720 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 96% | 51,547 psi | 81% | 3041 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 47,732 psi | 75% | 2831 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 43,033 psi | 67% | 2818 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 96% | 50,270 psi | 79% | 2989 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,316 psi | 84% | 3061 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,341 psi | 76% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,706 psi | 81% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,826 psi | 59% | 2730 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,047 psi | 67% | 2861 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,743 psi | 67% | 2812 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 92% | 43,207 psi | 68% | 2864 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,876 psi | 44% | 2470 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,649 psi | 53% | 2654 fps | 95.4% |
| Alliant Reloder-26 | 70.7 gr | 82% | 31,995 psi | 50% | 2648 fps | 95.5% |
| Bofors RP15 | <<locked>> | 94% | 42,612 psi | 67% | 2848 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 48,950 psi | 77% | 2871 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 43,207 psi | 68% | 2864 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,844 psi | 67% | 2736 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 49,211 psi | 77% | 2884 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 41,017 psi | 64% | 2769 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 43,859 psi | 69% | 2792 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 94% | 50,198 psi | 79% | 2933 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 52,765 psi | 83% | 2979 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,418 psi | 56% | 2618 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,635 psi | 84% | 2976 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,656 psi | 67% | 2927 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 39,987 psi | 63% | 2779 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 43% | 1680 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,227 psi | 79% | 2871 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,402 psi | 82% | 2900 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 40,959 psi | 64% | 2717 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,193 psi | 69% | 2769 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 37,521 psi | 59% | 2674 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 53,040 psi | 83% | 2963 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,967 psi | 81% | 2930 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 96% | 47,979 psi | 75% | 2959 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 50,444 psi | 79% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,785 psi | 65% | 2717 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 40,074 psi | 63% | 2697 fps | 96.3% |
| Lovex S071 | <<locked>> | 90% | 34,287 psi | 54% | 2592 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 51,039 psi | 80% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,569 psi | 68% | 2808 fps | 95.2% |
| Norma MRP | 73.7 gr | 88% | 39,653 psi | 62% | 2815 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 38,769 psi | 61% | 2717 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 51,619 psi | 81% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,964 psi | 75% | 2969 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 37,623 psi | 59% | 2700 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 94% | 39,769 psi | 62% | 2769 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 44% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,153 psi | 77% | 2867 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,745 psi | 72% | 2917 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,899 psi | 61% | 2740 fps | 98.1% |
| ReloadSwiss RS 70 | 68.4 gr | 80% | 37,608 psi | 59% | 2746 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,566 psi | 62% | 2844 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 52,359 psi | 82% | 2881 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,064 psi | 72% | 2815 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,601 psi | 75% | 2858 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 41,959 psi | 66% | 2795 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 42,844 psi | 67% | 2736 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,785 psi | 65% | 2717 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 50,444 psi | 79% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,074 psi | 63% | 2697 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,239 psi | 74% | 2871 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,050 psi | 74% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,843 psi | 64% | 2657 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,440 psi | 70% | 2851 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 46,253 psi | 72% | 2812 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 52,156 psi | 82% | 2904 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 35,157 psi | 55% | 2667 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 39,769 psi | 62% | 2717 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 52,663 psi | 83% | 2838 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,823 psi | 83% | 2854 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,193 psi | 69% | 2740 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,147 psi | 63% | 2717 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 41,887 psi | 66% | 2753 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 51,082 psi | 80% | 2844 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,653 psi | 62% | 2717 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 30,835 psi | 48% | 2549 fps | 96.2% |
| Vihtavuori N560 | <<locked>> | 94% | 49,197 psi | 77% | 2995 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,291 psi | 62% | 2684 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 41,017 psi | 64% | 2769 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,295 psi | 41% | 2500 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,962 psi | 70% | 2818 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 94 powders for .300 Weath. Mag. loaded with the .308 | 165gr | RWS Speed Tip Professional. Norma MRP delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,880 fps to 3,136 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 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 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 165gr | RWS Speed Tip Professional they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.