Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 170gr | Hornady InterLock FP bullet and 87 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and ReloadSwiss RS 70.
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% | 55,811 psi | 89% | 2822 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 53,403 psi | 86% | 2838 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,187 psi | 88% | 2940 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 56,275 psi | 90% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,577 psi | 86% | 2933 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 56,217 psi | 90% | 2910 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,389 psi | 87% | 2972 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,782 psi | 89% | 3025 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,564 psi | 89% | 3035 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,505 psi | 86% | 2881 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,853 psi | 86% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,346 psi | 87% | 2992 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,506 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,780 psi | 86% | 2963 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,781 psi | 88% | 3022 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,692 psi | 83% | 2953 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,889 psi | 72% | 2874 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,579 psi | 89% | 3094 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,038 psi | 80% | 2940 fps | 97.1% |
| Bofors RP3 | <<locked>> | 84% | 54,447 psi | 87% | 2900 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,781 psi | 88% | 3022 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 53,824 psi | 86% | 2881 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 84% | 54,810 psi | 88% | 2917 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 55,535 psi | 89% | 2986 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 55,390 psi | 89% | 2943 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 98% | 55,840 psi | 90% | 2966 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,607 psi | 88% | 2946 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,679 psi | 88% | 2917 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,927 psi | 90% | 2949 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,048 psi | 71% | 2904 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 90% | 55,941 psi | 90% | 3022 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,405 psi | 58% | 1824 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,593 psi | 89% | 2894 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,752 psi | 88% | 2874 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 54,810 psi | 88% | 2917 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,332 psi | 89% | 2910 fps | 99.1% |
| IMR 4831 | <<locked>> | 92% | 53,911 psi | 86% | 2927 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,259 psi | 89% | 2933 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,882 psi | 86% | 2900 fps | 96.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,142 psi | 85% | 2995 fps | 96.5% |
| Lovex S062 | <<locked>> | 84% | 56,043 psi | 90% | 2887 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,651 psi | 89% | 2910 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 53,490 psi | 86% | 2897 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,716 psi | 73% | 2782 fps | 98.5% |
| Norma 203B | <<locked>> | 82% | 53,214 psi | 85% | 2890 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,680 psi | 89% | 2969 fps | 97.9% |
| Norma MRP | <<locked>> | 98% | 54,389 psi | 87% | 3048 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 55,709 psi | 89% | 2972 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,708 psi | 86% | 2913 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,534 psi | 86% | 3012 fps | 97% |
| Ramshot Hunter | <<locked>> | 92% | 54,665 psi | 88% | 2972 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,892 psi | 77% | 2884 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 59% | 1870 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,723 psi | 88% | 2900 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,911 psi | 88% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,243 psi | 85% | 2953 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,419 psi | 89% | 3041 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,903 psi | 70% | 2894 fps | 97.4% |
| Rottweil R 902 | <<locked>> | 82% | 54,346 psi | 87% | 2848 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,578 psi | 88% | 2897 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,144 psi | 90% | 2946 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 96% | 53,127 psi | 85% | 2949 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 88% | 53,824 psi | 86% | 2881 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,651 psi | 89% | 2910 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 56,043 psi | 90% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,490 psi | 86% | 2897 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,999 psi | 90% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,521 psi | 89% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,245 psi | 89% | 2861 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,289 psi | 90% | 3002 fps | 98.4% |
| Somchem S355 | <<locked>> | 86% | 54,505 psi | 87% | 2890 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,404 psi | 87% | 2881 fps | 95.9% |
| Somchem S365 | <<locked>> | 94% | 55,158 psi | 88% | 2972 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,708 psi | 86% | 2923 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 82% | 54,853 psi | 88% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,027 psi | 88% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,767 psi | 89% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,389 psi | 87% | 2913 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,069 psi | 85% | 2900 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 53,171 psi | 85% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,388 psi | 86% | 2917 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 54,273 psi | 87% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,679 psi | 88% | 3038 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,896 psi | 86% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,767 psi | 89% | 2989 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,731 psi | 75% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,635 psi | 86% | 2913 fps | 97.7% |
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% | 52,330 psi | 84% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,980 psi | 80% | 2779 fps | 97.8% |
| Accurate 3100 | <<locked>> | 86% | 34,200 psi | 55% | 2536 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 49,588 psi | 80% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,840 psi | 61% | 2641 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 46,775 psi | 75% | 2756 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,744 psi | 72% | 2795 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 96% | 48,733 psi | 78% | 2897 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,750 psi | 83% | 2972 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,355 psi | 76% | 2779 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,357 psi | 81% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,927 psi | 59% | 2651 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,829 psi | 67% | 2779 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,440 psi | 71% | 2789 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,800 psi | 67% | 2776 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,050 psi | 43% | 2395 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,853 psi | 56% | 2635 fps | 96% |
| Alliant Reloder-26 | 67 gr | 82% | 30,922 psi | 50% | 2566 fps | 95% |
| Bofors RP15 | <<locked>> | 96% | 43,961 psi | 70% | 2822 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 47,630 psi | 76% | 2789 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,800 psi | 67% | 2776 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 41,872 psi | 67% | 2657 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 48,051 psi | 77% | 2802 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 39,784 psi | 64% | 2687 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 42,743 psi | 69% | 2710 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 52,272 psi | 84% | 2910 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,111 psi | 82% | 2887 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,476 psi | 55% | 2546 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,475 psi | 84% | 2897 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,205 psi | 66% | 2835 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 38,841 psi | 62% | 2697 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 44% | 1634 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,211 psi | 79% | 2789 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,271 psi | 82% | 2815 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 39,958 psi | 64% | 2638 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,236 psi | 69% | 2687 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 36,535 psi | 59% | 2595 fps | 97.8% |
| IMR 4895 | <<locked>> | 80% | 51,663 psi | 83% | 2874 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,647 psi | 81% | 2844 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 98% | 49,748 psi | 80% | 2933 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 49,443 psi | 79% | 2785 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,785 psi | 65% | 2638 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 39,102 psi | 63% | 2618 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 35,404 psi | 57% | 2566 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 49,719 psi | 80% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,281 psi | 73% | 2785 fps | 95.7% |
| Norma MRP | 69.8 gr | 88% | 38,276 psi | 61% | 2730 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 37,724 psi | 60% | 2638 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 50,198 psi | 80% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,499 psi | 75% | 2881 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 36,463 psi | 58% | 2618 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 41,365 psi | 66% | 2753 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 45% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,993 psi | 77% | 2785 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,440 psi | 71% | 2835 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,753 psi | 61% | 2657 fps | 97.8% |
| ReloadSwiss RS 70 | 64.8 gr | 80% | 36,506 psi | 59% | 2661 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,261 psi | 61% | 2756 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 51,256 psi | 82% | 2799 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,904 psi | 72% | 2736 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,400 psi | 79% | 2831 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 90% | 43,366 psi | 70% | 2769 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 41,872 psi | 67% | 2657 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,785 psi | 65% | 2638 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 49,443 psi | 79% | 2785 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,102 psi | 63% | 2618 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,963 psi | 74% | 2789 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,977 psi | 74% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,001 psi | 64% | 2582 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,975 psi | 69% | 2762 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 45,121 psi | 72% | 2733 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,749 psi | 81% | 2822 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 34,113 psi | 55% | 2592 fps | 99.6% |
| Somchem S385 | <<locked>> | 88% | 41,408 psi | 66% | 2697 fps | 95.9% |
| Vihtavuori N135 | <<locked>> | 80% | 51,430 psi | 82% | 2759 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,677 psi | 83% | 2776 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,134 psi | 69% | 2664 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,001 psi | 63% | 2635 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 40,712 psi | 65% | 2674 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 49,980 psi | 80% | 2769 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,580 psi | 62% | 2638 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 29,907 psi | 48% | 2477 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 96% | 51,024 psi | 82% | 2972 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,232 psi | 61% | 2605 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 39,929 psi | 64% | 2690 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,541 psi | 41% | 2421 fps | 95.3% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,656 psi | 70% | 2736 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 87 powders for .300 Win. Mag. loaded with the .308 | 170gr | Hornady InterLock FP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,094 fps. Accurate 3100 gives the best case fill at 100 %, and 87 of the 87 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 170.0 gr projectile in 0.308" calls for a 1:6.0 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. Alliant Reloder-26, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .300 Win. Mag. with the .308 | 170gr | Hornady InterLock FP 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.