Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 220gr | Hornady InterLock RN bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 54,708 psi | 88% | 2598 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,275 psi | 90% | 2621 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,231 psi | 90% | 2740 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 92% | 53,156 psi | 85% | 2687 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 53,316 psi | 85% | 2628 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 54,636 psi | 88% | 2687 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,791 psi | 78% | 2595 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,439 psi | 70% | 2562 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 53,635 psi | 86% | 2628 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 53,708 psi | 86% | 2625 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,418 psi | 87% | 2635 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,318 psi | 90% | 2667 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,636 psi | 88% | 2684 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,608 psi | 89% | 2648 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,810 psi | 88% | 2710 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,014 psi | 90% | 2736 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,246 psi | 90% | 2651 fps | 97% |
| Bofors RP15 | <<locked>> | 96% | 53,606 psi | 86% | 2667 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,836 psi | 82% | 2661 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 54,636 psi | 88% | 2684 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 55,114 psi | 88% | 2572 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,679 psi | 86% | 2674 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 54,375 psi | 87% | 2625 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 53,403 psi | 86% | 2582 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 54,491 psi | 87% | 2628 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 53,548 psi | 86% | 2615 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 53,940 psi | 86% | 2556 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,766 psi | 86% | 2779 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,476 psi | 87% | 2661 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,144 psi | 60% | 1608 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 53,272 psi | 85% | 2566 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 53,287 psi | 85% | 2546 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 53,055 psi | 85% | 2569 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,767 psi | 89% | 2615 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 96% | 56,173 psi | 90% | 2720 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,059 psi | 63% | 2470 fps | 96.3% |
| Lovex S065 | <<locked>> | 84% | 53,795 psi | 86% | 2546 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,245 psi | 89% | 2589 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,724 psi | 89% | 2612 fps | 100% |
| Norma 204 | <<locked>> | 86% | 53,940 psi | 86% | 2615 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 39,102 psi | 63% | 2497 fps | 98.5% |
| Norma MRP | <<locked>> | 92% | 54,404 psi | 87% | 2703 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,621 psi | 88% | 2605 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 52,895 psi | 85% | 2684 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 53,534 psi | 86% | 2615 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,143 psi | 88% | 2680 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 61% | 1647 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,086 psi | 90% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,273 psi | 87% | 2671 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,244 psi | 87% | 2776 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,226 psi | 79% | 2674 fps | 97.7% |
| Rottweil R 904 | <<locked>> | 90% | 54,549 psi | 87% | 2602 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 92% | 55,898 psi | 90% | 2657 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,114 psi | 88% | 2572 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 53,795 psi | 86% | 2546 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,245 psi | 89% | 2589 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,304 psi | 90% | 2448 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 52,968 psi | 85% | 2503 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,463 psi | 89% | 2654 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 56,202 psi | 90% | 2566 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,028 psi | 90% | 2598 fps | 98.7% |
| Somchem S365 | <<locked>> | 88% | 54,955 psi | 88% | 2608 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 52,939 psi | 85% | 2585 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 53,737 psi | 86% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,420 psi | 90% | 2598 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,912 psi | 90% | 2615 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 55,608 psi | 89% | 2605 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,534 psi | 87% | 2631 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,230 psi | 87% | 2700 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 53,838 psi | 86% | 2680 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,357 psi | 81% | 2677 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,724 psi | 89% | 2559 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,375 psi | 87% | 2625 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,185 psi | 85% | 2733 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,275 psi | 90% | 2631 fps | 99.8% |
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 3100 | <<locked>> | 80% | 34,360 psi | 55% | 2254 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 46,021 psi | 74% | 2474 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 37,159 psi | 60% | 2398 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 86% | 43,134 psi | 69% | 2513 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 38,392 psi | 62% | 2365 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 84% | 39,044 psi | 63% | 2408 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 37,565 psi | 60% | 2375 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 88% | 29,660 psi | 48% | 2234 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,725 psi | 62% | 2365 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,150 psi | 71% | 2480 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,850 psi | 82% | 2585 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,377 psi | 62% | 2362 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,127 psi | 55% | 2306 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,953 psi | 53% | 2277 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,747 psi | 46% | 2198 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,897 psi | 58% | 2405 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 49,777 psi | 80% | 2546 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 34,026 psi | 55% | 2303 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 36,434 psi | 58% | 2395 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 34,127 psi | 55% | 2306 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 48,646 psi | 78% | 2474 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 35,911 psi | 58% | 2343 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 47,529 psi | 76% | 2520 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 50,067 psi | 80% | 2533 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 38,972 psi | 62% | 2359 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 40,944 psi | 66% | 2398 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,669 psi | 67% | 2375 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 31,966 psi | 51% | 2323 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 47,007 psi | 75% | 2546 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 45% | 1434 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,164 psi | 71% | 2418 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,024 psi | 80% | 2497 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 43,758 psi | 70% | 2425 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,348 psi | 61% | 2313 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 37,579 psi | 60% | 2388 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 36,666 psi | 59% | 2418 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 47,572 psi | 76% | 2451 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,006 psi | 74% | 2448 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 29,675 psi | 48% | 2142 fps | 96.6% |
| Norma 204 | <<locked>> | 80% | 44,019 psi | 71% | 2454 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 30,168 psi | 48% | 2280 fps | 95% |
| Norma MRP | 61.5 gr | 80% | 35,795 psi | 57% | 2372 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 45,208 psi | 72% | 2464 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,144 psi | 60% | 2395 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 43,845 psi | 70% | 2461 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 84% | 33,112 psi | 53% | 2287 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,442 psi | 46% | 1470 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,803 psi | 73% | 2493 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,918 psi | 70% | 2513 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 30,951 psi | 50% | 2300 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 42,438 psi | 68% | 2549 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 39,798 psi | 64% | 2349 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 37,826 psi | 61% | 2349 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 48,646 psi | 78% | 2474 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,572 psi | 76% | 2451 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,006 psi | 74% | 2448 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,953 psi | 85% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,456 psi | 74% | 2405 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,492 psi | 60% | 2346 fps | 96.8% |
| Somchem S355 | <<locked>> | 80% | 52,736 psi | 85% | 2516 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,248 psi | 65% | 2336 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 42,192 psi | 68% | 2425 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,203 psi | 61% | 2333 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 50,589 psi | 81% | 2451 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,514 psi | 75% | 2457 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,170 psi | 53% | 2221 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 45,919 psi | 74% | 2461 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,956 psi | 59% | 2343 fps | 99.9% |
| Vihtavuori N560 | 63 gr | 82% | 38,522 psi | 62% | 2418 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 38,624 psi | 62% | 2411 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 43,801 psi | 70% | 2559 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,498 psi | 73% | 2421 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,718 psi | 77% | 2523 fps | 99.7% |
| Winchester StaBALL HD | 60.8 gr | 80% | 29,225 psi | 47% | 2297 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,824 psi | 56% | 2264 fps | 95.7% |
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 75 powders for .300 Win. Mag. loaded with the .308 | 220gr | Hornady InterLock RN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,779 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,779 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for .300 Win. Mag. with the .308 | 220gr | Hornady InterLock RN 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.