Load Specifications
Load data in caliber .300 Weath. Mag. with .306 | 155gr | Fox Classic Hunter bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Alliant Reloder-26.
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>> | 84% | 56,869 psi | 89% | 2995 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,085 psi | 86% | 3012 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,692 psi | 83% | 3045 fps | 99.1% |
| Accurate 4064 | <<locked>> | 86% | 57,348 psi | 90% | 3051 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,752 psi | 86% | 3107 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 56,463 psi | 88% | 3084 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,360 psi | 85% | 3035 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,144 psi | 88% | 3150 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,682 psi | 90% | 3225 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,115 psi | 88% | 3143 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,969 psi | 86% | 3058 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,390 psi | 87% | 3084 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,680 psi | 87% | 3169 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,203 psi | 90% | 3196 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,317 psi | 87% | 3133 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 3130 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,516 psi | 78% | 3064 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,033 psi | 67% | 2969 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3278 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,855 psi | 89% | 3104 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,124 psi | 75% | 3045 fps | 96% |
| Bofors RP3 | <<locked>> | 86% | 55,767 psi | 87% | 3074 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 3130 fps | 97.2% |
| Bofors RP7 | <<locked>> | 90% | 55,434 psi | 87% | 3058 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 86% | 56,405 psi | 88% | 3094 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 57,188 psi | 90% | 3163 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 90% | 57,072 psi | 89% | 3123 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 82% | 57,116 psi | 90% | 3094 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,999 psi | 88% | 3087 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,983 psi | 85% | 3077 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,867 psi | 84% | 3136 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 57% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,723 psi | 86% | 3041 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,246 psi | 90% | 3074 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,536 psi | 89% | 3054 fps | 98.9% |
| IMR 4350 | <<locked>> | 94% | 56,420 psi | 88% | 3091 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,101 psi | 89% | 3087 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 55,259 psi | 87% | 3097 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,840 psi | 89% | 3114 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,593 psi | 87% | 3074 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 82% | 57,101 psi | 89% | 3058 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,303 psi | 87% | 3005 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,377 psi | 90% | 3064 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,029 psi | 89% | 3081 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 54,853 psi | 86% | 3068 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,453 psi | 68% | 2874 fps | 97.4% |
| Norma 201 | <<locked>> | 82% | 55,100 psi | 86% | 3025 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,999 psi | 88% | 3022 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,650 psi | 86% | 3068 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,508 psi | 90% | 3146 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 56,173 psi | 88% | 3225 fps | 99% |
| Norma URP | <<locked>> | 94% | 57,334 psi | 90% | 3150 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,564 psi | 87% | 3094 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,246 psi | 88% | 3150 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,774 psi | 72% | 2976 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,738 psi | 58% | 1982 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,478 psi | 89% | 3077 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,376 psi | 88% | 3156 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,855 psi | 89% | 3192 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,926 psi | 86% | 3130 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,566 psi | 90% | 3225 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,709 psi | 87% | 3025 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,825 psi | 87% | 3071 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,157 psi | 85% | 3058 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 98% | 54,447 psi | 85% | 3117 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 55,434 psi | 87% | 3058 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,029 psi | 89% | 3081 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,101 psi | 89% | 3058 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,377 psi | 90% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,853 psi | 86% | 3068 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,012 psi | 85% | 3077 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,100 psi | 86% | 3054 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,941 psi | 88% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,043 psi | 89% | 2956 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,000 psi | 89% | 3031 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,969 psi | 85% | 3110 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 55,666 psi | 87% | 2949 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,753 psi | 87% | 3064 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,608 psi | 89% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,158 psi | 86% | 3094 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 56,492 psi | 89% | 2936 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,231 psi | 88% | 2986 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,594 psi | 89% | 3002 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,377 psi | 90% | 3041 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,840 psi | 88% | 3087 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 3005 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 84% | 54,752 psi | 86% | 2992 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,853 psi | 86% | 3091 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 3150 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 3212 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,869 psi | 88% | 3058 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,464 psi | 90% | 3166 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,730 psi | 70% | 3114 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,201 psi | 87% | 3058 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,622 psi | 87% | 3091 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% | 49,661 psi | 78% | 2887 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,080 psi | 75% | 2887 fps | 96.8% |
| Accurate 3100 | <<locked>> | 90% | 36,956 psi | 58% | 2733 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 47,079 psi | 74% | 2890 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,665 psi | 56% | 2723 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 80% | 52,982 psi | 83% | 3025 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,976 psi | 70% | 2867 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 92% | 45,934 psi | 72% | 2959 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,734 psi | 78% | 3087 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 46,006 psi | 72% | 2956 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,382 psi | 71% | 2894 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,457 psi | 76% | 2963 fps | 99.7% |
| Alliant Reloder-16 | 62.8 gr | 80% | 35,143 psi | 55% | 2740 fps | 96.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,958 psi | 63% | 2877 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,426 psi | 71% | 2949 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,861 psi | 72% | 3002 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,095 psi | 46% | 2582 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,360 psi | 55% | 2776 fps | 95.3% |
| Alliant Reloder-26 | 74.6 gr | 86% | 33,837 psi | 53% | 2776 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,968 psi | 83% | 3041 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 45,020 psi | 71% | 2979 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 45,426 psi | 71% | 2900 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 45,861 psi | 72% | 3002 fps | 95.5% |
| Bofors RP7 | <<locked>> | 82% | 42,786 psi | 67% | 2815 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 45,948 psi | 72% | 2907 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 40,799 psi | 64% | 2844 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 82% | 43,932 psi | 69% | 2874 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 53,563 psi | 84% | 3038 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,576 psi | 51% | 2628 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,372 psi | 79% | 3015 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,931 psi | 67% | 2923 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 42% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,314 psi | 80% | 2986 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,297 psi | 74% | 2904 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,777 psi | 78% | 2936 fps | 97.9% |
| IMR 4350 | <<locked>> | 84% | 40,959 psi | 64% | 2792 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,727 psi | 65% | 2795 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 34,490 psi | 54% | 2677 fps | 96.4% |
| IMR 4895 | <<locked>> | 80% | 49,705 psi | 78% | 2995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,156 psi | 82% | 3012 fps | 95% |
| Lovex D073.6 | <<locked>> | 80% | 53,258 psi | 83% | 2999 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,112 psi | 82% | 2953 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,456 psi | 74% | 2904 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,972 psi | 61% | 2736 fps | 96.5% |
| Lovex S070 | <<locked>> | 82% | 39,682 psi | 62% | 2769 fps | 95.5% |
| Lovex S071 | <<locked>> | 96% | 37,927 psi | 59% | 2756 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 51,634 psi | 81% | 2966 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,504 psi | 82% | 2969 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,805 psi | 75% | 2949 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 46,702 psi | 73% | 2953 fps | 95.3% |
| Norma MRP | <<locked>> | 92% | 41,989 psi | 66% | 2949 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 35,766 psi | 56% | 2726 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 80% | 48,225 psi | 76% | 2969 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 37,260 psi | 58% | 2769 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 42,453 psi | 67% | 2904 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,427 psi | 43% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,108 psi | 72% | 2890 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,446 psi | 82% | 3091 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,554 psi | 67% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,621 psi | 56% | 2743 fps | 96.4% |
| ReloadSwiss RS 70 | 68.7 gr | 80% | 34,780 psi | 55% | 2746 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 49,124 psi | 77% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,685 psi | 67% | 2838 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 50,720 psi | 79% | 2995 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 92% | 44,353 psi | 70% | 2927 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 42,786 psi | 67% | 2815 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,972 psi | 61% | 2736 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,258 psi | 83% | 2999 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,456 psi | 74% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,682 psi | 62% | 2769 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,048 psi | 69% | 2897 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,532 psi | 81% | 2995 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,576 psi | 82% | 2904 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,338 psi | 69% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,886 psi | 64% | 2736 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,050 psi | 74% | 2986 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 52,286 psi | 82% | 2900 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,120 psi | 68% | 2841 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 32,227 psi | 51% | 2677 fps | 98.7% |
| Somchem S385 | <<locked>> | 90% | 42,163 psi | 66% | 2848 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 53,156 psi | 83% | 2887 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,356 psi | 77% | 2884 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,719 psi | 78% | 2897 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,191 psi | 65% | 2769 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 37,188 psi | 58% | 2730 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 96% | 44,396 psi | 70% | 2881 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 48,008 psi | 75% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,637 psi | 57% | 2726 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 84% | 32,039 psi | 50% | 2664 fps | 96% |
| Vihtavuori N560 | <<locked>> | 98% | 52,591 psi | 82% | 3143 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,492 psi | 57% | 2697 fps | 98.9% |
| Winchester 760 | <<locked>> | 82% | 40,799 psi | 64% | 2844 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,383 psi | 43% | 2605 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,547 psi | 81% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,904 psi | 70% | 2897 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 95 powders for .300 Weath. Mag. loaded with the .306 | 155gr | Fox Classic Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,278 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,278 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 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 155.0 gr projectile in 0.306" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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. ReloadSwiss RS 70, Alliant Reloder-16, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .306 | 155gr | Fox Classic Hunter 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.