Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 220gr | Winchester Silvertip bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Winchester StaBALL HD.
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>> | 92% | 54,462 psi | 87% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,782 psi | 89% | 2628 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 53,722 psi | 86% | 2703 fps | 98% |
| ADI AR 2209 | <<locked>> | 88% | 52,779 psi | 85% | 2635 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 54,186 psi | 87% | 2697 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,040 psi | 83% | 2664 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,441 psi | 74% | 2628 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 53,185 psi | 85% | 2631 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,796 psi | 89% | 2677 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,418 psi | 87% | 2694 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,796 psi | 89% | 2661 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,926 psi | 88% | 2720 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,144 psi | 90% | 2746 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,492 psi | 89% | 2661 fps | 97.3% |
| Bofors RP15 | <<locked>> | 94% | 53,606 psi | 86% | 2680 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,665 psi | 88% | 2730 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 54,418 psi | 87% | 2694 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 54,070 psi | 87% | 2575 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,505 psi | 86% | 2687 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 54,897 psi | 88% | 2621 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 94% | 53,621 psi | 86% | 2631 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 90% | 52,953 psi | 85% | 2621 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 53,287 psi | 85% | 2559 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,012 psi | 87% | 2795 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 53,621 psi | 86% | 2661 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 60% | 1634 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,898 psi | 90% | 2618 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,608 psi | 89% | 2598 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 53,983 psi | 87% | 2592 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,071 psi | 88% | 2621 fps | 99% |
| IMR 7828 SSC | <<locked>> | 92% | 55,956 psi | 90% | 2733 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,047 psi | 67% | 2539 fps | 97.5% |
| Lovex S065 | <<locked>> | 84% | 56,391 psi | 90% | 2595 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,636 psi | 88% | 2595 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,622 psi | 89% | 2621 fps | 100% |
| Norma 204 | <<locked>> | 84% | 53,156 psi | 85% | 2618 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 42,279 psi | 68% | 2566 fps | 99.3% |
| Norma MRP | <<locked>> | 90% | 54,230 psi | 87% | 2710 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,186 psi | 87% | 2612 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,970 psi | 90% | 2743 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 86% | 56,434 psi | 90% | 2667 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 52,866 psi | 85% | 2661 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,232 psi | 61% | 1670 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,666 psi | 89% | 2651 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 53,838 psi | 86% | 2674 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,259 psi | 87% | 2789 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2749 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 88% | 53,882 psi | 86% | 2605 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 55,492 psi | 89% | 2667 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 54,070 psi | 87% | 2575 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,391 psi | 90% | 2595 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,636 psi | 88% | 2595 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,361 psi | 89% | 2552 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,056 psi | 88% | 2664 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 55,100 psi | 88% | 2602 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 54,810 psi | 88% | 2615 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,927 psi | 90% | 2641 fps | 100% |
| Unknown powder | <<locked>> | 82% | 54,143 psi | 87% | 2608 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 53,838 psi | 86% | 2510 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 54,346 psi | 87% | 2579 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 53,766 psi | 86% | 2602 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 54,969 psi | 88% | 2621 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,520 psi | 87% | 2638 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,476 psi | 87% | 2720 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 53,853 psi | 86% | 2694 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,346 psi | 87% | 2749 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 51,822 psi | 83% | 2743 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,926 psi | 88% | 2562 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,664 psi | 86% | 2740 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 53,330 psi | 86% | 2605 fps | 99.7% |
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 3100 | <<locked>> | 80% | 36,608 psi | 59% | 2310 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 48,805 psi | 78% | 2530 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 43,526 psi | 70% | 2526 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 40,466 psi | 65% | 2421 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 38,653 psi | 62% | 2415 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 90% | 37,362 psi | 60% | 2388 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 86% | 29,660 psi | 48% | 2244 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,572 psi | 75% | 2530 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,611 psi | 65% | 2418 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,332 psi | 58% | 2365 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,143 psi | 56% | 2329 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,443 psi | 49% | 2254 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,624 psi | 62% | 2467 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 46,180 psi | 74% | 2500 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 33,939 psi | 54% | 2310 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 34,098 psi | 55% | 2346 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 36,332 psi | 58% | 2365 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 50,865 psi | 82% | 2526 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 88% | 35,868 psi | 58% | 2356 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 80% | 48,414 psi | 78% | 2520 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 84% | 38,827 psi | 62% | 2369 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 37,840 psi | 61% | 2349 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,932 psi | 70% | 2421 fps | 100% |
| Hodgdon Retumbo | 64.1 gr | 82% | 31,836 psi | 51% | 2333 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 49,908 psi | 80% | 2605 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 45% | 1453 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,253 psi | 74% | 2470 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,170 psi | 84% | 2549 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 42,003 psi | 67% | 2405 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,190 psi | 64% | 2365 fps | 96% |
| IMR 7828 SSC | <<locked>> | 80% | 37,144 psi | 60% | 2392 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 36,927 psi | 59% | 2434 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 49,821 psi | 80% | 2503 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,225 psi | 77% | 2497 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 31,604 psi | 51% | 2195 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 46,499 psi | 75% | 2510 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 30,429 psi | 49% | 2293 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 38,232 psi | 61% | 2431 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 47,630 psi | 76% | 2513 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,479 psi | 62% | 2434 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 46,383 psi | 74% | 2516 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,518 psi | 54% | 2306 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 46% | 1493 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,544 psi | 78% | 2549 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,702 psi | 75% | 2569 fps | 100% |
| ReloadSwiss RS 76 | 68.6 gr | 82% | 30,777 psi | 49% | 2306 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 39,624 psi | 64% | 2503 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 41,858 psi | 67% | 2402 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 80% | 39,987 psi | 64% | 2405 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,865 psi | 82% | 2526 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,821 psi | 80% | 2503 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,225 psi | 77% | 2497 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,733 psi | 78% | 2457 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,653 psi | 64% | 2402 fps | 97.7% |
| Somchem S361 | <<locked>> | 80% | 42,424 psi | 68% | 2392 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 44,744 psi | 72% | 2470 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,408 psi | 65% | 2388 fps | 98.5% |
| Unknown powder | <<locked>> | 80% | 50,894 psi | 82% | 2562 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 47,761 psi | 77% | 2425 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,865 psi | 82% | 2530 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,171 psi | 55% | 2251 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 51,517 psi | 83% | 2572 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,334 psi | 63% | 2398 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 39,001 psi | 63% | 2438 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 38,479 psi | 62% | 2418 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 92% | 41,060 psi | 66% | 2516 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 98% | 48,370 psi | 78% | 2684 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,022 psi | 77% | 2470 fps | 100% |
| Winchester StaBALL HD | 64.2 gr | 80% | 31,415 psi | 50% | 2362 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,190 psi | 64% | 2385 fps | 97.7% |
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 70 powders for .300 Win. Mag. loaded with the .308 | 220gr | Winchester Silvertip. Hodgdon Retumbo delivers the highest muzzle velocity at 2,795 fps; across all powders the maximum-charge window runs from 1,634 fps to 2,795 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 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 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .300 Win. Mag. with the .308 | 220gr | Winchester Silvertip 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.