Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 165gr | Barnes TSX BT bullet and 97 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-17 and ReloadSwiss RS 60.
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% | 53,766 psi | 86% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,072 psi | 90% | 2904 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,965 psi | 79% | 2871 fps | 98.6% |
| Accurate 4064 | <<locked>> | 86% | 54,099 psi | 87% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,969 psi | 88% | 2992 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 54,012 psi | 87% | 2923 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,303 psi | 89% | 2927 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 52,852 psi | 85% | 2972 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,289 psi | 90% | 2920 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,201 psi | 87% | 3048 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,680 psi | 89% | 2949 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,057 psi | 90% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,927 psi | 90% | 3051 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,635 psi | 86% | 3025 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,680 psi | 89% | 3022 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,081 psi | 79% | 2953 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,137 psi | 74% | 2897 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,306 psi | 65% | 2799 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 3087 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,882 psi | 86% | 2936 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 52,808 psi | 85% | 2910 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,081 psi | 79% | 2953 fps | 96.4% |
| Bofors RP7 | <<locked>> | 92% | 56,014 psi | 90% | 2946 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,188 psi | 90% | 2953 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,534 psi | 86% | 2927 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 53,954 psi | 87% | 2989 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 90% | 54,056 psi | 87% | 2949 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 54,592 psi | 88% | 2930 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,246 psi | 90% | 2972 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,766 psi | 88% | 2969 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,099 psi | 87% | 3025 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 58% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,651 psi | 89% | 2933 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,114 psi | 88% | 2913 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,766 psi | 88% | 2910 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,998 psi | 87% | 2887 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 53,388 psi | 86% | 2920 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,418 psi | 87% | 2920 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 55,521 psi | 89% | 2982 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 53,824 psi | 86% | 2946 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 56,173 psi | 90% | 2959 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 82% | 56,289 psi | 90% | 2920 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,027 psi | 87% | 2894 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,200 psi | 85% | 2848 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,650 psi | 88% | 2904 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,157 psi | 87% | 2917 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 55,419 psi | 89% | 2956 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,335 psi | 65% | 2710 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 55,970 psi | 90% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,316 psi | 85% | 2864 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,288 psi | 89% | 2956 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,012 psi | 87% | 2969 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 51,909 psi | 83% | 3038 fps | 98.4% |
| Norma URP | <<locked>> | 94% | 53,998 psi | 87% | 2979 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 56,260 psi | 90% | 2986 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,391 psi | 90% | 3031 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,608 psi | 59% | 1873 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,534 psi | 86% | 2910 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,171 psi | 85% | 2982 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,243 psi | 85% | 3022 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,027 psi | 88% | 3015 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,896 psi | 86% | 3048 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 53,316 psi | 85% | 2867 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,405 psi | 90% | 2959 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,665 psi | 88% | 2946 fps | 96.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,578 psi | 88% | 3002 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 56,014 psi | 90% | 2946 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,157 psi | 87% | 2917 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,027 psi | 87% | 2894 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,650 psi | 88% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,419 psi | 89% | 2956 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,592 psi | 88% | 2969 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,013 psi | 88% | 2923 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,941 psi | 90% | 2946 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,867 psi | 86% | 2802 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,592 psi | 88% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,012 psi | 87% | 2867 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,085 psi | 87% | 2995 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 53,330 psi | 86% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,810 psi | 88% | 2913 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,127 psi | 85% | 2904 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 52,808 psi | 85% | 2982 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2982 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 54,375 psi | 87% | 2785 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,388 psi | 86% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,012 psi | 87% | 2844 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,433 psi | 87% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,246 psi | 90% | 2972 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,718 psi | 77% | 2835 fps | 96.5% |
| Vihtavuori N540 | <<locked>> | 86% | 55,738 psi | 89% | 2890 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,259 psi | 89% | 2979 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2979 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,202 psi | 90% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,201 psi | 87% | 2995 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,336 psi | 66% | 2933 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,217 psi | 90% | 2956 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,851 psi | 83% | 2913 fps | 96.7% |
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% | 47,152 psi | 76% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,992 psi | 74% | 2733 fps | 96.3% |
| Accurate 3100 | <<locked>> | 92% | 36,956 psi | 59% | 2635 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 44,672 psi | 72% | 2740 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,402 psi | 54% | 2569 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 80% | 50,517 psi | 81% | 2864 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,917 psi | 69% | 2710 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 46,253 psi | 74% | 2851 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,692 psi | 84% | 2867 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,949 psi | 75% | 2920 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,076 psi | 69% | 2736 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,064 psi | 74% | 2805 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,315 psi | 53% | 2589 fps | 96.3% |
| Alliant Reloder-17 | 61 gr | 80% | 37,608 psi | 60% | 2720 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,672 psi | 73% | 2841 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,788 psi | 73% | 2890 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,325 psi | 44% | 2434 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,418 psi | 57% | 2674 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,895 psi | 54% | 2684 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,459 psi | 81% | 2881 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,062 psi | 69% | 2743 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,788 psi | 73% | 2890 fps | 95.5% |
| Bofors RP7 | <<locked>> | 82% | 40,785 psi | 65% | 2661 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,301 psi | 84% | 2894 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,656 psi | 70% | 2753 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 41,031 psi | 66% | 2746 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 84% | 44,440 psi | 71% | 2772 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 51,097 psi | 82% | 2877 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,690 psi | 49% | 2480 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,616 psi | 76% | 2854 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 40,408 psi | 65% | 2759 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 43% | 1634 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,139 psi | 79% | 2828 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,576 psi | 83% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,121 psi | 72% | 2746 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,558 psi | 76% | 2776 fps | 97.4% |
| IMR 4350 | <<locked>> | 86% | 41,510 psi | 67% | 2697 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,682 psi | 64% | 2638 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 32,489 psi | 52% | 2530 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 47,253 psi | 76% | 2835 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,533 psi | 84% | 2900 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 52,692 psi | 84% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,444 psi | 81% | 2838 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,053 psi | 80% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,266 psi | 73% | 2749 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,130 psi | 60% | 2585 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 40,234 psi | 65% | 2674 fps | 95.7% |
| Lovex S071 | <<locked>> | 98% | 37,840 psi | 61% | 2657 fps | 95.9% |
| Norma 201 | <<locked>> | 80% | 49,385 psi | 79% | 2812 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,038 psi | 80% | 2815 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,397 psi | 73% | 2789 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 47,050 psi | 75% | 2848 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 42,090 psi | 67% | 2848 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 33,707 psi | 54% | 2575 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 45,600 psi | 73% | 2812 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 37,492 psi | 60% | 2674 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,238 psi | 44% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,947 psi | 70% | 2733 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,559 psi | 79% | 2920 fps | 99.8% |
| ReloadSwiss RS 60 | 61 gr | 80% | 40,089 psi | 64% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,286 psi | 53% | 2585 fps | 95.6% |
| ReloadSwiss RS 70 | 63.5 gr | 82% | 35,288 psi | 57% | 2657 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 47,050 psi | 75% | 2762 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,422 psi | 65% | 2684 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 51,271 psi | 82% | 2887 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 44,556 psi | 71% | 2822 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 82% | 40,785 psi | 65% | 2661 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,130 psi | 60% | 2585 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,444 psi | 81% | 2838 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,266 psi | 73% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,234 psi | 65% | 2674 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,640 psi | 67% | 2740 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,474 psi | 83% | 2867 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,066 psi | 79% | 2835 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,517 psi | 81% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,409 psi | 68% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,783 psi | 62% | 2585 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,121 psi | 71% | 2818 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,183 psi | 80% | 2749 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,300 psi | 82% | 2858 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,060 psi | 66% | 2687 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 30,168 psi | 48% | 2523 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 42,293 psi | 68% | 2746 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,053 psi | 82% | 2740 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,065 psi | 75% | 2733 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,427 psi | 76% | 2743 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,117 psi | 63% | 2618 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,070 psi | 56% | 2575 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 44,469 psi | 71% | 2776 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 45,759 psi | 73% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,592 psi | 55% | 2575 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 29,907 psi | 48% | 2516 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,650 psi | 56% | 2552 fps | 98.5% |
| Winchester 760 | <<locked>> | 84% | 41,234 psi | 66% | 2749 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,427 psi | 44% | 2516 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,979 psi | 79% | 2841 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,121 psi | 72% | 2792 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 111 powders for .300 Win. Mag. loaded with the .308 | 165gr | Barnes TSX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,087 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, 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, Accurate MAGPRO, ADI AR 2213 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-17, ReloadSwiss RS 60 rank at the top here: for .300 Win. Mag. with the .308 | 165gr | Barnes TSX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Hodgdon H1000 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.