Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 165gr | Barnes TTSX BT 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-26 and Accurate High Country.
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% | 55,434 psi | 87% | 2884 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,276 psi | 90% | 2969 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 3009 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 56,072 psi | 88% | 2946 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,580 psi | 90% | 3064 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 56,971 psi | 89% | 3159 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 86% | 56,434 psi | 88% | 2982 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,027 psi | 86% | 3054 fps | 98.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,478 psi | 89% | 3107 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,057 psi | 88% | 3110 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,100 psi | 86% | 3048 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,261 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,392 psi | 90% | 3028 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,607 psi | 86% | 3064 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,014 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,360 psi | 85% | 3038 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 3100 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,170 psi | 82% | 3022 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,353 psi | 71% | 2946 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,536 psi | 89% | 3173 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,560 psi | 79% | 3012 fps | 97.3% |
| Bofors RP3 | <<locked>> | 84% | 54,505 psi | 85% | 2969 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 3100 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 57,464 psi | 90% | 3009 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 54,853 psi | 86% | 2986 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 55,912 psi | 88% | 3058 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 55,622 psi | 87% | 3018 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 98% | 56,608 psi | 89% | 3048 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,187 psi | 86% | 3025 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,969 psi | 86% | 2986 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,391 psi | 88% | 3025 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,266 psi | 69% | 2972 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 90% | 56,550 psi | 89% | 3100 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 57% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,782 psi | 89% | 2986 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,941 psi | 88% | 2966 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,955 psi | 86% | 2946 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 55,259 psi | 87% | 2992 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,695 psi | 87% | 2986 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 54,259 psi | 85% | 2995 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,245 psi | 87% | 3002 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,447 psi | 85% | 2976 fps | 96.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,606 psi | 84% | 3071 fps | 96.7% |
| Lovex S060 | <<locked>> | 82% | 57,174 psi | 90% | 2949 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,927 psi | 88% | 2956 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,738 psi | 87% | 2979 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 57,246 psi | 90% | 3025 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,759 psi | 72% | 2844 fps | 98.5% |
| Norma 201 | <<locked>> | 82% | 57,159 psi | 90% | 2969 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,681 psi | 89% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,130 psi | 88% | 3045 fps | 98.1% |
| Norma MRP | <<locked>> | 98% | 55,013 psi | 86% | 3123 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 56,217 psi | 88% | 3045 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,998 psi | 85% | 2986 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3091 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 92% | 55,071 psi | 86% | 3045 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,240 psi | 76% | 2953 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 58% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,955 psi | 86% | 2972 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,419 psi | 87% | 3081 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,609 psi | 90% | 3087 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,159 psi | 88% | 3117 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,353 psi | 70% | 2969 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 82% | 54,433 psi | 85% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,607 psi | 86% | 2963 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,579 psi | 89% | 3022 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 98% | 57,261 psi | 90% | 3084 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 57,464 psi | 90% | 3009 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,738 psi | 87% | 2979 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 55,927 psi | 88% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,246 psi | 90% | 3025 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,449 psi | 88% | 3028 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,276 psi | 90% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,651 psi | 87% | 2851 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,361 psi | 87% | 2930 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,782 psi | 89% | 3077 fps | 98.5% |
| Somchem S335 | <<locked>> | 82% | 57,624 psi | 90% | 2890 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 54,447 psi | 85% | 2959 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,737 psi | 86% | 2956 fps | 96.1% |
| Somchem S365 | <<locked>> | 94% | 55,796 psi | 87% | 3048 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,696 psi | 90% | 3054 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 82% | 54,940 psi | 86% | 2877 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,085 psi | 86% | 2890 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,014 psi | 88% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,708 psi | 86% | 2986 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,519 psi | 84% | 2972 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 56,855 psi | 89% | 2936 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,435 psi | 90% | 3045 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,476 psi | 85% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,230 psi | 87% | 3110 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,433 psi | 85% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,144 psi | 88% | 3061 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,703 psi | 75% | 3084 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,493 psi | 90% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,317 psi | 85% | 2992 fps | 97.9% |
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% | 51,822 psi | 81% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,966 psi | 78% | 2848 fps | 97.8% |
| Accurate 3100 | <<locked>> | 88% | 36,434 psi | 57% | 2648 fps | 96% |
| Accurate 4064 | <<locked>> | 80% | 49,153 psi | 77% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,579 psi | 59% | 2697 fps | 98% |
| Accurate High Country | 77.1 gr | 92% | 45,977 psi | 72% | 2959 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 46,688 psi | 73% | 2818 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,976 psi | 70% | 2864 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 49,066 psi | 77% | 2972 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,112 psi | 82% | 3048 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 45,179 psi | 71% | 2864 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,297 psi | 74% | 2844 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,444 psi | 79% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,869 psi | 58% | 2713 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,003 psi | 66% | 2844 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,614 psi | 70% | 2854 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,076 psi | 66% | 2844 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,701 psi | 42% | 2438 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,824 psi | 55% | 2694 fps | 96% |
| Alliant Reloder-26 | 72.5 gr | 84% | 33,156 psi | 52% | 2690 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 44,193 psi | 69% | 2887 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 47,485 psi | 74% | 2854 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,076 psi | 66% | 2844 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,669 psi | 65% | 2717 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 47,921 psi | 75% | 2867 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 39,813 psi | 62% | 2749 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 42,743 psi | 67% | 2772 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 52,663 psi | 83% | 2982 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,576 psi | 81% | 2963 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,229 psi | 54% | 2598 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,634 psi | 82% | 2966 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,408 psi | 65% | 2904 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 38,812 psi | 61% | 2756 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 42% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,272 psi | 83% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,110 psi | 77% | 2858 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,561 psi | 81% | 2890 fps | 98.7% |
| IMR 4350 | <<locked>> | 82% | 40,030 psi | 63% | 2700 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,381 psi | 68% | 2756 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 36,230 psi | 57% | 2648 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 51,750 psi | 81% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 51,068 psi | 80% | 2917 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 50,053 psi | 78% | 3005 fps | 95.8% |
| Lovex S060 | <<locked>> | 80% | 53,882 psi | 84% | 2897 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,356 psi | 77% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,582 psi | 64% | 2697 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 38,812 psi | 61% | 2674 fps | 95.9% |
| Lovex S071 | <<locked>> | 92% | 35,157 psi | 55% | 2618 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 53,577 psi | 84% | 2913 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,792 psi | 78% | 2900 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,556 psi | 71% | 2854 fps | 95.8% |
| Norma MRP | <<locked>> | 88% | 38,377 psi | 60% | 2792 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 37,521 psi | 59% | 2694 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 50,401 psi | 79% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,847 psi | 73% | 2953 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 36,448 psi | 57% | 2677 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 41,452 psi | 65% | 2815 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,008 psi | 75% | 2851 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,715 psi | 70% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,594 psi | 59% | 2713 fps | 97.7% |
| ReloadSwiss RS 70 | 68.4 gr | 80% | 36,463 psi | 57% | 2723 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,261 psi | 60% | 2815 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 51,024 psi | 80% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,628 psi | 70% | 2795 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,647 psi | 78% | 2904 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 90% | 43,598 psi | 68% | 2838 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 41,669 psi | 65% | 2717 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,582 psi | 64% | 2697 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 49,356 psi | 77% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,812 psi | 61% | 2674 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,064 psi | 72% | 2854 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,563 psi | 84% | 2943 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,992 psi | 72% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,798 psi | 62% | 2641 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,207 psi | 68% | 2828 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 54,114 psi | 85% | 2841 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,947 psi | 70% | 2795 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,155 psi | 80% | 2894 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 34,040 psi | 53% | 2648 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 41,278 psi | 65% | 2756 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 51,387 psi | 81% | 2828 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,663 psi | 81% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,975 psi | 67% | 2723 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,972 psi | 61% | 2694 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 40,828 psi | 64% | 2736 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 49,908 psi | 78% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,392 psi | 60% | 2694 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 29,573 psi | 46% | 2523 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 96% | 51,445 psi | 81% | 3045 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,174 psi | 60% | 2664 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 39,972 psi | 63% | 2753 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,919 psi | 42% | 2533 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,708 psi | 84% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,903 psi | 69% | 2805 fps | 95.5% |
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 .308 | 165gr | Barnes TTSX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,173 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,173 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 165.0 gr projectile in 0.308" calls for a 1:11.5 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, Accurate High Country rank at the top here: for .300 Weath. Mag. with the .308 | 165gr | Barnes TTSX BT 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.