Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets bullet and 88 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 Vihtavuori N560.
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 2700 | <<locked>> | 82% | 54,694 psi | 88% | 2641 fps | 99.4% |
| Accurate 3100 | <<locked>> | 98% | 52,997 psi | 85% | 2687 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 53,853 psi | 86% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,998 psi | 88% | 2726 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,492 psi | 89% | 2835 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 84% | 54,375 psi | 87% | 2654 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,217 psi | 90% | 2779 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 98% | 53,679 psi | 86% | 2776 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,724 psi | 59% | 2507 fps | 96.7% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,391 psi | 90% | 2779 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,013 psi | 88% | 2671 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,274 psi | 89% | 2694 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,275 psi | 90% | 2785 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,679 psi | 86% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,622 psi | 89% | 2769 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,881 psi | 85% | 2772 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,751 psi | 86% | 2753 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,340 psi | 74% | 2694 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,824 psi | 86% | 2838 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,822 psi | 83% | 2753 fps | 98.7% |
| Bofors RP3 | <<locked>> | 84% | 55,695 psi | 89% | 2687 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,148 psi | 68% | 2618 fps | 96% |
| Bofors RP5 | <<locked>> | 98% | 52,881 psi | 85% | 2772 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 55,216 psi | 89% | 2684 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,021 psi | 74% | 2638 fps | 97% |
| Hodgdon H380 | <<locked>> | 84% | 56,217 psi | 90% | 2710 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 53,577 psi | 86% | 2730 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 53,490 psi | 86% | 2694 fps | 99% |
| Hodgdon H4831 | <<locked>> | 96% | 54,070 psi | 87% | 2726 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,420 psi | 90% | 2759 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,420 psi | 90% | 2707 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,440 psi | 73% | 2736 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 88% | 53,867 psi | 86% | 2769 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 59% | 1663 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,722 psi | 86% | 2635 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,217 psi | 90% | 2674 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 56,434 psi | 90% | 2720 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,519 psi | 86% | 2657 fps | 99.6% |
| IMR 4831 | <<locked>> | 92% | 55,521 psi | 89% | 2720 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,448 psi | 89% | 2713 fps | 97.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,911 psi | 88% | 2808 fps | 98.2% |
| Lovex S062 | <<locked>> | 82% | 53,809 psi | 86% | 2625 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,606 psi | 86% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,737 psi | 88% | 2694 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,137 psi | 76% | 2602 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 54,563 psi | 87% | 2680 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,548 psi | 86% | 2717 fps | 98.7% |
| Norma MRP | <<locked>> | 98% | 56,434 psi | 90% | 2851 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 53,795 psi | 86% | 2713 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,492 psi | 89% | 2707 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,622 psi | 89% | 2831 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 56,405 psi | 90% | 2772 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,400 psi | 79% | 2703 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 60% | 1699 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,115 psi | 90% | 2697 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 53,084 psi | 85% | 2743 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,143 psi | 88% | 2756 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,563 psi | 86% | 2782 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,397 psi | 73% | 2733 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 82% | 55,608 psi | 89% | 2635 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,101 psi | 90% | 2687 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,143 psi | 87% | 2697 fps | 98% |
| Rottweil R 905 | <<locked>> | 96% | 54,940 psi | 88% | 2756 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 55,216 psi | 89% | 2684 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,606 psi | 86% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 53,809 psi | 86% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,737 psi | 88% | 2694 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,041 psi | 87% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,519 psi | 86% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,113 psi | 85% | 2612 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,476 psi | 87% | 2753 fps | 99.1% |
| Somchem S355 | <<locked>> | 86% | 55,898 psi | 90% | 2680 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,840 psi | 90% | 2694 fps | 97.6% |
| Somchem S365 | <<locked>> | 92% | 53,461 psi | 86% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,303 psi | 89% | 2730 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 56,144 psi | 90% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 53,809 psi | 86% | 2612 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,869 psi | 90% | 2710 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,723 psi | 88% | 2710 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 82% | 54,650 psi | 88% | 2608 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,940 psi | 88% | 2713 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,941 psi | 90% | 2772 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 52,721 psi | 85% | 2789 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,167 psi | 77% | 2700 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,637 psi | 89% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,838 psi | 86% | 2733 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,342 psi | 79% | 2822 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,608 psi | 89% | 2730 fps | 99% |
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 2700 | <<locked>> | 80% | 51,097 psi | 82% | 2585 fps | 99% |
| Accurate 3100 | <<locked>> | 82% | 30,443 psi | 49% | 2264 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,705 psi | 81% | 2569 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,957 psi | 62% | 2464 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 47,819 psi | 77% | 2707 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 47,877 psi | 77% | 2556 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 37,797 psi | 61% | 2451 fps | 95% |
| ADI AR 2213 | <<locked>> | 92% | 43,976 psi | 71% | 2605 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 34,447 psi | 55% | 2448 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 37,913 psi | 61% | 2451 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,617 psi | 78% | 2579 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,851 psi | 83% | 2644 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,927 psi | 61% | 2474 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,163 psi | 69% | 2589 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,536 psi | 60% | 2444 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,739 psi | 61% | 2493 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,702 psi | 44% | 2244 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,428 psi | 47% | 2306 fps | 95.3% |
| Alliant Reloder-26 | 60.7 gr | 80% | 29,530 psi | 47% | 2349 fps | 96.4% |
| Bofors RP15 | <<locked>> | 92% | 39,755 psi | 64% | 2533 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 48,878 psi | 78% | 2589 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,421 psi | 63% | 2559 fps | 95% |
| Bofors RP5 | <<locked>> | 88% | 37,739 psi | 61% | 2493 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 42,757 psi | 69% | 2474 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 96% | 40,016 psi | 64% | 2520 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 49,197 psi | 79% | 2605 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,104 psi | 66% | 2513 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 43,990 psi | 71% | 2530 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 92% | 47,050 psi | 75% | 2612 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,180 psi | 74% | 2595 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,375 psi | 57% | 2369 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,202 psi | 60% | 2549 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 39,871 psi | 64% | 2523 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 44% | 1483 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,343 psi | 81% | 2585 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,576 psi | 84% | 2618 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 38,551 psi | 62% | 2411 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,338 psi | 71% | 2503 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 37,376 psi | 60% | 2418 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,934 psi | 74% | 2556 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 41,858 psi | 67% | 2575 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 50,473 psi | 81% | 2579 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,800 psi | 67% | 2457 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 40,001 psi | 64% | 2441 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 29,704 psi | 48% | 2244 fps | 95% |
| Norma 203B | <<locked>> | 80% | 51,213 psi | 82% | 2631 fps | 100% |
| Norma 204 | <<locked>> | 80% | 37,942 psi | 61% | 2434 fps | 95% |
| Norma MRP | 61.9 gr | 84% | 34,389 psi | 55% | 2444 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 38,812 psi | 62% | 2457 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 80% | 51,837 psi | 83% | 2657 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,539 psi | 67% | 2582 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 37,550 psi | 60% | 2448 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 36,883 psi | 59% | 2467 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 45% | 1519 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,284 psi | 79% | 2592 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,890 psi | 74% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,827 psi | 62% | 2484 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,608 psi | 60% | 2493 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,055 psi | 55% | 2470 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 52,446 psi | 84% | 2589 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,035 psi | 74% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 41,989 psi | 67% | 2487 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 84% | 36,680 psi | 59% | 2428 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 42,757 psi | 69% | 2474 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,800 psi | 67% | 2457 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 50,473 psi | 81% | 2579 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,001 psi | 64% | 2441 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,311 psi | 76% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,181 psi | 76% | 2441 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,799 psi | 65% | 2405 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,899 psi | 62% | 2480 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 46,325 psi | 74% | 2539 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,672 psi | 73% | 2533 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 35,288 psi | 57% | 2418 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 34,693 psi | 56% | 2359 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,808 psi | 85% | 2549 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,251 psi | 71% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,205 psi | 64% | 2457 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 36,579 psi | 59% | 2395 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,126 psi | 82% | 2562 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,523 psi | 63% | 2457 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 30,705 psi | 49% | 2316 fps | 97.8% |
| Vihtavuori N560 | 67.8 gr | 92% | 46,021 psi | 74% | 2671 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 98% | 45,020 psi | 72% | 2644 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,262 psi | 63% | 2428 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,104 psi | 66% | 2513 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,236 psi | 39% | 2221 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 88% | 38,957 psi | 62% | 2448 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 88 powders for .300 Win. Mag. loaded with the .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets. Norma MRP delivers the highest muzzle velocity at 2,851 fps; across all powders the maximum-charge window runs from 1,663 fps to 2,851 fps. ADI AR 2225 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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, Vihtavuori N560 rank at the top here: for .300 Win. Mag. with the .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets 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.