Load Specifications
Load data in caliber .300 Weath. Mag. with .307 | 150gr | Rhino Solid Shank bullet and 86 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 Alliant Reloder-16.
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 2495 | <<locked>> | 82% | 57,014 psi | 89% | 3041 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,433 psi | 85% | 3054 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3156 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 57,508 psi | 90% | 3104 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,027 psi | 86% | 3159 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 57,276 psi | 90% | 3133 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,985 psi | 88% | 3199 fps | 97.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 3255 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,985 psi | 89% | 3264 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,028 psi | 88% | 3192 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,766 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,781 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,550 psi | 87% | 3219 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,985 psi | 89% | 3241 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,303 psi | 87% | 3182 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3248 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,519 psi | 84% | 3176 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,456 psi | 73% | 3091 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,708 psi | 84% | 3258 fps | 99.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,779 psi | 81% | 3159 fps | 96.9% |
| Bofors RP3 | <<locked>> | 84% | 55,608 psi | 87% | 3120 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3248 fps | 98% |
| Bofors RP7 | <<locked>> | 88% | 54,984 psi | 86% | 3100 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 84% | 55,898 psi | 88% | 3136 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 57,116 psi | 90% | 3212 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 56,565 psi | 89% | 3166 fps | 98% |
| Hodgdon H4831 | <<locked>> | 98% | 57,609 psi | 90% | 3192 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,086 psi | 88% | 3140 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,377 psi | 90% | 3179 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 53,635 psi | 84% | 3179 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 57% | 1995 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,638 psi | 90% | 3140 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,623 psi | 89% | 3117 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,651 psi | 87% | 3094 fps | 98.8% |
| IMR 4350 | <<locked>> | 92% | 56,188 psi | 88% | 3140 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,608 psi | 89% | 3133 fps | 98.9% |
| IMR 4831 | <<locked>> | 92% | 55,448 psi | 87% | 3150 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,188 psi | 88% | 3156 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,347 psi | 87% | 3120 fps | 95.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,781 psi | 86% | 3222 fps | 96.3% |
| Lovex S062 | <<locked>> | 84% | 56,985 psi | 89% | 3110 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,768 psi | 89% | 3130 fps | 99.6% |
| Lovex S070 | <<locked>> | 90% | 54,636 psi | 86% | 3114 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,239 psi | 74% | 2992 fps | 98.3% |
| Norma 203B | <<locked>> | 84% | 57,653 psi | 90% | 3169 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,159 psi | 90% | 3192 fps | 97.7% |
| Norma MRP | <<locked>> | 98% | 56,405 psi | 88% | 3278 fps | 99% |
| Norma URP | <<locked>> | 92% | 57,130 psi | 90% | 3196 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,984 psi | 86% | 3136 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,361 psi | 87% | 3238 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 92% | 56,159 psi | 88% | 3196 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,647 psi | 78% | 3100 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 58% | 2041 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,738 psi | 87% | 3117 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,579 psi | 89% | 3238 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,969 psi | 86% | 3179 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,174 psi | 90% | 3268 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,730 psi | 72% | 3114 fps | 97.3% |
| Rottweil R 902 | <<locked>> | 82% | 55,376 psi | 87% | 3071 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,666 psi | 87% | 3117 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,624 psi | 90% | 3169 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 96% | 54,607 psi | 86% | 3169 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 88% | 54,984 psi | 86% | 3100 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,768 psi | 89% | 3130 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 56,985 psi | 89% | 3110 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,636 psi | 86% | 3114 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,508 psi | 90% | 3179 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,304 psi | 88% | 2995 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,362 psi | 88% | 3074 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,143 psi | 85% | 3163 fps | 97.5% |
| Somchem S355 | <<locked>> | 86% | 55,506 psi | 87% | 3110 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 56,971 psi | 89% | 3202 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,288 psi | 87% | 3143 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 82% | 55,796 psi | 87% | 3028 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,115 psi | 88% | 3045 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,898 psi | 89% | 3084 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,709 psi | 87% | 3136 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,563 psi | 86% | 3114 fps | 98% |
| Vihtavuori N540 | <<locked>> | 82% | 54,157 psi | 85% | 3031 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,737 psi | 86% | 3133 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 55,999 psi | 88% | 3205 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,536 psi | 89% | 3261 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,288 psi | 87% | 3094 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,319 psi | 90% | 3215 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,052 psi | 77% | 3238 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,332 psi | 87% | 3133 fps | 97.5% |
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 2495 | <<locked>> | 80% | 53,388 psi | 84% | 2992 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,908 psi | 80% | 2992 fps | 97.4% |
| Accurate 3100 | <<locked>> | 88% | 37,724 psi | 59% | 2789 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 50,546 psi | 79% | 2995 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,798 psi | 61% | 2838 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 80% | 47,514 psi | 74% | 2966 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 90% | 45,905 psi | 72% | 3005 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 98% | 53,592 psi | 84% | 3182 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,055 psi | 83% | 3199 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 46,079 psi | 72% | 3005 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,167 psi | 75% | 2992 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,387 psi | 81% | 3064 fps | 99.9% |
| Alliant Reloder-16 | 66.7 gr | 80% | 37,579 psi | 59% | 2844 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,946 psi | 67% | 2989 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 45,542 psi | 71% | 2995 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 46,166 psi | 72% | 3051 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 29,544 psi | 46% | 2631 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,839 psi | 56% | 2828 fps | 95.5% |
| Alliant Reloder-26 | 77.3 gr | 84% | 34,272 psi | 54% | 2825 fps | 95.7% |
| Bofors RP15 | <<locked>> | 96% | 45,339 psi | 71% | 3028 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 48,776 psi | 76% | 3005 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 46,166 psi | 72% | 3051 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 42,583 psi | 67% | 2858 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,994 psi | 77% | 3015 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 40,741 psi | 64% | 2887 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 80% | 43,656 psi | 68% | 2917 fps | 95% |
| Hodgdon H4831 | <<locked>> | 96% | 53,664 psi | 84% | 3127 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,215 psi | 55% | 2736 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,563 psi | 84% | 3120 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 42,888 psi | 67% | 2966 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 43% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,056 psi | 85% | 3081 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,980 psi | 78% | 3005 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,272 psi | 82% | 3035 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 43,424 psi | 68% | 2894 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,063 psi | 69% | 2894 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 37,304 psi | 58% | 2789 fps | 97.3% |
| IMR 4895 | <<locked>> | 80% | 52,721 psi | 83% | 3097 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,967 psi | 81% | 3058 fps | 95% |
| IMR 7828 SSC | <<locked>> | 98% | 51,198 psi | 80% | 3153 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 50,183 psi | 79% | 2999 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,553 psi | 65% | 2838 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 39,871 psi | 62% | 2815 fps | 95.5% |
| Lovex S071 | <<locked>> | 92% | 36,376 psi | 57% | 2753 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 50,734 psi | 80% | 3051 fps | 100% |
| Norma 204 | <<locked>> | 86% | 46,586 psi | 73% | 2995 fps | 95.3% |
| Norma MRP | 80.4 gr | 90% | 42,351 psi | 66% | 2999 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 38,551 psi | 60% | 2831 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 51,401 psi | 81% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 51,387 psi | 81% | 3163 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,333 psi | 59% | 2812 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 96% | 42,801 psi | 67% | 2959 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,702 psi | 43% | 1827 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,950 psi | 77% | 2995 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,629 psi | 72% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,653 psi | 61% | 2854 fps | 97.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,434 psi | 59% | 2858 fps | 96.5% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 42,453 psi | 67% | 3031 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 52,141 psi | 82% | 3015 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,876 psi | 72% | 2946 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 50,618 psi | 79% | 3045 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 90% | 44,643 psi | 70% | 2976 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 42,583 psi | 67% | 2858 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,553 psi | 65% | 2838 fps | 97.2% |
| Shooters World Precision | <<locked>> | 80% | 50,183 psi | 79% | 2999 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,871 psi | 62% | 2815 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,934 psi | 74% | 2999 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,847 psi | 73% | 2851 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,770 psi | 64% | 2776 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,251 psi | 69% | 2972 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 45,992 psi | 72% | 2943 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 34,925 psi | 55% | 2782 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 42,438 psi | 67% | 2897 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 52,402 psi | 82% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,620 psi | 82% | 2992 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,034 psi | 69% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,914 psi | 63% | 2835 fps | 97.9% |
| Vihtavuori N165 | <<locked>> | 94% | 44,701 psi | 70% | 2930 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 50,894 psi | 80% | 2979 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,407 psi | 62% | 2831 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 30,690 psi | 48% | 2657 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 96% | 52,707 psi | 83% | 3192 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,044 psi | 61% | 2799 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 40,915 psi | 64% | 2890 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 28,007 psi | 44% | 2664 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 92% | 44,904 psi | 70% | 2940 fps | 95% |
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 86 powders for .300 Weath. Mag. loaded with the .307 | 150gr | Rhino Solid Shank. Norma MRP delivers the highest muzzle velocity at 3,278 fps; across all powders the maximum-charge window runs from 1,995 fps to 3,278 fps. Accurate 3100 gives the best case fill at 100 %, and 86 of the 86 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 150.0 gr projectile in 0.307" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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, Alliant Reloder-16 rank at the top here: for .300 Weath. Mag. with the .307 | 150gr | Rhino Solid Shank 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.