Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 165gr | Swift A-Frame bullet and 92 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.
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% | 54,128 psi | 87% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,229 psi | 85% | 2854 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,924 psi | 85% | 2940 fps | 99.2% |
| Accurate 4064 | <<locked>> | 84% | 54,592 psi | 88% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,216 psi | 89% | 2999 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,505 psi | 87% | 2923 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,188 psi | 90% | 3038 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,780 psi | 86% | 3022 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,766 psi | 86% | 3045 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,390 psi | 89% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,492 psi | 89% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,753 psi | 89% | 3054 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,374 psi | 86% | 3022 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,434 psi | 89% | 3025 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,547 psi | 84% | 3022 fps | 97.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,516 psi | 79% | 2956 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,323 psi | 69% | 2871 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,069 psi | 85% | 3094 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,269 psi | 77% | 2940 fps | 96.3% |
| Bofors RP3 | <<locked>> | 86% | 56,101 psi | 90% | 2963 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,547 psi | 84% | 3022 fps | 97.4% |
| Bofors RP7 | <<locked>> | 90% | 55,622 psi | 89% | 2946 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 84% | 53,040 psi | 85% | 2923 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 88% | 55,071 psi | 88% | 3012 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 92% | 55,492 psi | 89% | 2979 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,072 psi | 90% | 2976 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,476 psi | 87% | 2966 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,679 psi | 86% | 3022 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 58% | 1847 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,244 psi | 87% | 2917 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,432 psi | 86% | 2887 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,650 psi | 86% | 2900 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,666 psi | 89% | 2923 fps | 98.9% |
| IMR 4350 | <<locked>> | 92% | 53,142 psi | 85% | 2923 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,983 psi | 87% | 2920 fps | 98.6% |
| IMR 4831 | <<locked>> | 98% | 56,231 psi | 90% | 2999 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,461 psi | 86% | 2943 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,680 psi | 89% | 2963 fps | 96% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,230 psi | 89% | 3064 fps | 96.5% |
| Lovex S060 | <<locked>> | 82% | 55,738 psi | 89% | 2894 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,215 psi | 87% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,925 psi | 86% | 2917 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 55,129 psi | 88% | 2956 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,918 psi | 70% | 2782 fps | 97.8% |
| Norma 201 | <<locked>> | 82% | 55,622 psi | 89% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,246 psi | 90% | 2907 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,795 psi | 88% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,635 psi | 86% | 2969 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 56,014 psi | 90% | 3110 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 53,795 psi | 86% | 2979 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 55,753 psi | 89% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,187 psi | 88% | 3071 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 94% | 56,304 psi | 90% | 3035 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,692 psi | 83% | 2982 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 59% | 1893 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,434 psi | 90% | 2959 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,852 psi | 85% | 3015 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,013 psi | 88% | 3018 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,519 psi | 86% | 3045 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,347 psi | 90% | 2913 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,231 psi | 90% | 2959 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,172 psi | 87% | 2946 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 98% | 54,520 psi | 87% | 3005 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 55,622 psi | 89% | 2946 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,925 psi | 86% | 2917 fps | 99.5% |
| Shooters World Precision | <<locked>> | 84% | 54,215 psi | 87% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,129 psi | 88% | 2956 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,360 psi | 87% | 2969 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,201 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,434 psi | 90% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,867 psi | 86% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,592 psi | 86% | 2867 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,070 psi | 87% | 3002 fps | 97.7% |
| Somchem S335 | <<locked>> | 82% | 56,101 psi | 90% | 2838 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,159 psi | 90% | 2953 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,188 psi | 90% | 2940 fps | 95.9% |
| Somchem S365 | <<locked>> | 94% | 53,011 psi | 85% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,332 psi | 89% | 2986 fps | 98.5% |
| Unknown powder | <<locked>> | 90% | 54,549 psi | 87% | 2986 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 82% | 53,214 psi | 85% | 2776 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 53,214 psi | 85% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,115 psi | 90% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,244 psi | 87% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,984 psi | 88% | 2956 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,255 psi | 79% | 2867 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 84% | 55,753 psi | 89% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,230 psi | 89% | 3002 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,521 psi | 89% | 3038 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,608 psi | 89% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,071 psi | 88% | 3012 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,759 psi | 72% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 53,519 psi | 86% | 2946 fps | 97.3% |
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% | 50,662 psi | 81% | 2789 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,569 psi | 70% | 2680 fps | 95.9% |
| Accurate 3100 | <<locked>> | 88% | 35,027 psi | 56% | 2589 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 47,964 psi | 77% | 2792 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,405 psi | 58% | 2641 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 80% | 45,455 psi | 73% | 2766 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 46,151 psi | 74% | 2854 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 98% | 50,343 psi | 81% | 2959 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,096 psi | 80% | 2982 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,701 psi | 73% | 2785 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,878 psi | 78% | 2858 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,708 psi | 57% | 2651 fps | 97.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,350 psi | 65% | 2782 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,730 psi | 73% | 2848 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,050 psi | 74% | 2900 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,818 psi | 45% | 2451 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,781 psi | 57% | 2687 fps | 95.9% |
| Alliant Reloder-26 | 68 gr | 84% | 31,923 psi | 51% | 2625 fps | 95% |
| Bofors RP15 | <<locked>> | 98% | 45,194 psi | 72% | 2881 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,137 psi | 74% | 2799 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,050 psi | 74% | 2900 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 40,611 psi | 65% | 2661 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,398 psi | 74% | 2805 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 41,742 psi | 67% | 2762 fps | 96.2% |
| Hodgdon H4350 | <<locked>> | 84% | 43,265 psi | 69% | 2753 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,199 psi | 53% | 2546 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,688 psi | 76% | 2854 fps | 100% |
| Hodgdon Superformance | 68.4 gr | 82% | 40,132 psi | 64% | 2756 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 44% | 1650 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,964 psi | 77% | 2812 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,198 psi | 80% | 2841 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,614 psi | 72% | 2740 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,874 psi | 70% | 2707 fps | 96.8% |
| IMR 4350 | <<locked>> | 84% | 41,292 psi | 66% | 2697 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,032 psi | 67% | 2694 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 31,879 psi | 51% | 2510 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 50,154 psi | 80% | 2887 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,301 psi | 84% | 2904 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 51,648 psi | 83% | 2999 fps | 95.6% |
| Lovex S060 | <<locked>> | 80% | 52,373 psi | 84% | 2841 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,950 psi | 77% | 2799 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,552 psi | 63% | 2641 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 37,840 psi | 61% | 2621 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 36,158 psi | 58% | 2618 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 52,214 psi | 84% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,750 psi | 85% | 2858 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,254 psi | 77% | 2844 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 46,833 psi | 75% | 2848 fps | 95.6% |
| Norma MRP | <<locked>> | 90% | 39,479 psi | 63% | 2789 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 36,347 psi | 58% | 2638 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 80% | 48,631 psi | 78% | 2867 fps | 99.9% |
| Ramshot Grand | <<locked>> | 96% | 51,198 psi | 82% | 3002 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 82% | 37,579 psi | 60% | 2677 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 44,324 psi | 71% | 2841 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 44% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,412 psi | 74% | 2785 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,888 psi | 69% | 2841 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,143 psi | 58% | 2657 fps | 96.9% |
| ReloadSwiss RS 70 | 64.2 gr | 80% | 35,346 psi | 57% | 2661 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 49,806 psi | 80% | 2812 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,439 psi | 70% | 2746 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 50,995 psi | 82% | 2890 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 92% | 44,628 psi | 72% | 2828 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 40,611 psi | 65% | 2661 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,552 psi | 63% | 2641 fps | 96.9% |
| Shooters World Precision | <<locked>> | 80% | 47,950 psi | 77% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,840 psi | 61% | 2621 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,498 psi | 71% | 2799 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,880 psi | 83% | 2884 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,113 psi | 85% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,875 psi | 72% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,812 psi | 62% | 2585 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,222 psi | 71% | 2822 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 52,750 psi | 85% | 2792 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,700 psi | 70% | 2743 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 52,547 psi | 84% | 2884 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 32,779 psi | 53% | 2592 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 42,525 psi | 68% | 2753 fps | 95.7% |
| Unknown powder | <<locked>> | 80% | 39,117 psi | 63% | 2694 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 80% | 50,096 psi | 80% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,009 psi | 80% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,371 psi | 79% | 2779 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,449 psi | 60% | 2585 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 39,320 psi | 63% | 2671 fps | 98% |
| Vihtavuori N165 | <<locked>> | 96% | 43,163 psi | 69% | 2753 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 49,226 psi | 79% | 2805 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,784 psi | 64% | 2713 fps | 98% |
| Vihtavuori N555 | <<locked>> | 82% | 30,560 psi | 49% | 2530 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,912 psi | 59% | 2608 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 41,742 psi | 67% | 2762 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,252 psi | 42% | 2474 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 46,267 psi | 74% | 2822 fps | 95.6% |
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 92 powders for .300 Win. Mag. loaded with the .308 | 165gr | Swift A-Frame. Norma MRP delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,110 fps. Accurate 3100 gives the best case fill at 100 %, and 92 of the 92 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 1:14.5 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 Win. Mag. with the .308 | 165gr | Swift A-Frame 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.