Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 155gr | Merlin Virtus bullet and 96 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-26 and Hodgdon Superformance.
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>> | 84% | 57,609 psi | 90% | 3009 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,840 psi | 88% | 3031 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,853 psi | 84% | 3068 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 54,491 psi | 85% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,825 psi | 87% | 3123 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,406 psi | 90% | 3104 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,187 psi | 86% | 3054 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,276 psi | 90% | 3173 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3156 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,578 psi | 86% | 3179 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,854 psi | 88% | 3074 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,043 psi | 88% | 3097 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,768 psi | 89% | 3189 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,302 psi | 85% | 3153 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,420 psi | 88% | 3156 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3153 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,676 psi | 79% | 3087 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,947 psi | 69% | 2992 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,476 psi | 85% | 3232 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,682 psi | 90% | 3123 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,182 psi | 77% | 3068 fps | 96.4% |
| Bofors RP3 | <<locked>> | 86% | 56,637 psi | 89% | 3091 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3153 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 56,188 psi | 88% | 3074 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 57,217 psi | 90% | 3110 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,563 psi | 86% | 3120 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 88% | 54,302 psi | 85% | 3081 fps | 97.7% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3146 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,072 psi | 89% | 3107 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,882 psi | 86% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 55,027 psi | 86% | 3159 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,187 psi | 57% | 1946 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,637 psi | 87% | 3058 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,520 psi | 85% | 3035 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,276 psi | 90% | 3074 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 57,377 psi | 90% | 3110 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,607 psi | 86% | 3051 fps | 98.7% |
| IMR 4831 | <<locked>> | 94% | 56,260 psi | 88% | 3117 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,537 psi | 90% | 3130 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,608 psi | 89% | 3097 fps | 96.2% |
| Lovex S060 | <<locked>> | 82% | 56,173 psi | 88% | 3022 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,723 psi | 86% | 3028 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,505 psi | 85% | 3045 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 55,811 psi | 87% | 3087 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,367 psi | 70% | 2897 fps | 97.7% |
| Norma 201 | <<locked>> | 82% | 55,782 psi | 87% | 3038 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,724 psi | 89% | 3038 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,332 psi | 87% | 3084 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,723 psi | 86% | 3104 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3248 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 54,694 psi | 86% | 3110 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 56,362 psi | 88% | 3110 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,562 psi | 82% | 3143 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 94% | 57,174 psi | 90% | 3166 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,847 psi | 73% | 3002 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,738 psi | 58% | 1988 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,217 psi | 90% | 3094 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,377 psi | 90% | 3176 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,795 psi | 84% | 3146 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,941 psi | 88% | 3150 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,505 psi | 85% | 3179 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,033 psi | 67% | 3009 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 84% | 56,652 psi | 89% | 3041 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,710 psi | 89% | 3084 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,259 psi | 87% | 3081 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 98% | 55,608 psi | 87% | 3140 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 56,188 psi | 88% | 3074 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,505 psi | 85% | 3045 fps | 99.5% |
| Shooters World Precision | <<locked>> | 84% | 54,723 psi | 86% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,811 psi | 87% | 3087 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,071 psi | 86% | 3097 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,941 psi | 88% | 3071 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,681 psi | 89% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,302 psi | 85% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,070 psi | 85% | 2992 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,129 psi | 86% | 3136 fps | 97.8% |
| Somchem S335 | <<locked>> | 82% | 56,333 psi | 88% | 2963 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,608 psi | 89% | 3081 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,130 psi | 90% | 3071 fps | 96% |
| Somchem S365 | <<locked>> | 96% | 57,725 psi | 90% | 3169 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,289 psi | 88% | 3117 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 57,232 psi | 90% | 2949 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,014 psi | 89% | 2999 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,464 psi | 90% | 3015 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,549 psi | 85% | 3005 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,869 psi | 89% | 3107 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 3028 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 84% | 55,550 psi | 87% | 3009 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,854 psi | 88% | 3110 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,478 psi | 89% | 3169 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3235 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,724 psi | 89% | 3071 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,781 psi | 86% | 3123 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,687 psi | 72% | 3140 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,246 psi | 88% | 3081 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3110 fps | 97.8% |
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% | 50,459 psi | 79% | 2904 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,849 psi | 77% | 2907 fps | 97.1% |
| Accurate 3100 | <<locked>> | 90% | 37,797 psi | 59% | 2756 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 47,848 psi | 75% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,492 psi | 57% | 2746 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 80% | 53,882 psi | 84% | 3045 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,614 psi | 71% | 2881 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 46,789 psi | 73% | 2982 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 98% | 51,227 psi | 80% | 3091 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,633 psi | 79% | 3110 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,079 psi | 72% | 2910 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,356 psi | 77% | 2982 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,853 psi | 56% | 2762 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,756 psi | 64% | 2900 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,296 psi | 73% | 2969 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,702 psi | 73% | 3022 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,688 psi | 43% | 2539 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,042 psi | 56% | 2795 fps | 95.7% |
| Alliant Reloder-26 | 75.8 gr | 86% | 34,606 psi | 54% | 2802 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,780 psi | 84% | 3058 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 45,832 psi | 72% | 2999 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,296 psi | 73% | 2917 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,702 psi | 73% | 3022 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 40,640 psi | 64% | 2772 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 46,775 psi | 73% | 2927 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 38,740 psi | 61% | 2802 fps | 95% |
| Hodgdon H4350 | <<locked>> | 82% | 44,541 psi | 70% | 2894 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,824 psi | 84% | 3084 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,199 psi | 52% | 2648 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,271 psi | 80% | 3031 fps | 100% |
| Hodgdon Superformance | 74.5 gr | 82% | 40,625 psi | 64% | 2874 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,992 psi | 42% | 1739 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,996 psi | 81% | 2999 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,979 psi | 75% | 2920 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,386 psi | 79% | 2953 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 41,684 psi | 65% | 2815 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,337 psi | 66% | 2812 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 35,085 psi | 55% | 2697 fps | 96.7% |
| IMR 4895 | <<locked>> | 80% | 50,647 psi | 79% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,939 psi | 83% | 3031 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 52,779 psi | 83% | 2969 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,182 psi | 76% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,566 psi | 62% | 2753 fps | 96.7% |
| Lovex S070 | <<locked>> | 82% | 40,451 psi | 63% | 2789 fps | 95.9% |
| Lovex S071 | <<locked>> | 94% | 36,216 psi | 57% | 2717 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 52,359 psi | 82% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,229 psi | 83% | 2986 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,675 psi | 76% | 2969 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,572 psi | 75% | 2972 fps | 95.7% |
| Norma MRP | <<locked>> | 90% | 40,045 psi | 63% | 2904 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 36,390 psi | 57% | 2743 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 49,037 psi | 77% | 2989 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 48,820 psi | 77% | 3068 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 82% | 37,985 psi | 60% | 2789 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 98% | 43,482 psi | 68% | 2930 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,412 psi | 43% | 1778 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,862 psi | 73% | 2910 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,476 psi | 84% | 3110 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,410 psi | 68% | 2966 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,361 psi | 57% | 2762 fps | 96.7% |
| ReloadSwiss RS 70 | 69.8 gr | 80% | 35,418 psi | 56% | 2766 fps | 95.9% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,943 psi | 63% | 2927 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 49,850 psi | 78% | 2933 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,410 psi | 68% | 2854 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 51,605 psi | 81% | 3018 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 92% | 45,266 psi | 71% | 2949 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 40,640 psi | 64% | 2772 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,566 psi | 62% | 2753 fps | 96.7% |
| Shooters World Precision | <<locked>> | 80% | 48,182 psi | 76% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,451 psi | 63% | 2789 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,875 psi | 70% | 2917 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,373 psi | 82% | 3012 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,316 psi | 84% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,020 psi | 71% | 2776 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,798 psi | 61% | 2694 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,860 psi | 70% | 2943 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 52,968 psi | 83% | 2913 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,787 psi | 69% | 2858 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 53,432 psi | 84% | 3012 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,851 psi | 51% | 2694 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 43,004 psi | 67% | 2871 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 53,925 psi | 85% | 2904 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,183 psi | 79% | 2900 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,401 psi | 79% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,829 psi | 66% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,956 psi | 59% | 2749 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 94% | 42,322 psi | 66% | 2841 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 48,805 psi | 76% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,347 psi | 59% | 2746 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 30,589 psi | 48% | 2625 fps | 95.4% |
| Vihtavuori N560 | <<locked>> | 98% | 53,650 psi | 84% | 3166 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,130 psi | 58% | 2717 fps | 99.1% |
| Winchester 760 | <<locked>> | 80% | 38,740 psi | 61% | 2802 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,992 psi | 44% | 2631 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,402 psi | 82% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,730 psi | 72% | 2917 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 96 powders for .300 Weath. Mag. loaded with the .308 | 155gr | Merlin Virtus. Norma MRP delivers the highest muzzle velocity at 3,248 fps; across all powders the maximum-charge window runs from 1,946 fps to 3,248 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 0.308" calls for a 1:12.5 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .308 | 155gr | Merlin Virtus 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.