Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 220gr | Remington SP Core-Lokt bullet and 66 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 ReloadSwiss RS 80.
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 3100 | <<locked>> | 90% | 56,318 psi | 88% | 2657 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,290 psi | 90% | 2677 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,998 psi | 86% | 2756 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 86% | 54,273 psi | 85% | 2690 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 55,883 psi | 88% | 2753 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 53,998 psi | 85% | 2726 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2759 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,228 psi | 82% | 2749 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,607 psi | 86% | 2674 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,406 psi | 90% | 2730 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,260 psi | 88% | 2749 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,331 psi | 85% | 2664 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,070 psi | 85% | 2730 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,621 psi | 86% | 2746 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,042 psi | 86% | 2815 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,637 psi | 89% | 2720 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 55,680 psi | 87% | 2740 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,595 psi | 90% | 2795 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 56,260 psi | 88% | 2749 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,550 psi | 87% | 2749 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,405 psi | 87% | 2690 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,360 psi | 85% | 2677 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,752 psi | 86% | 2602 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,753 psi | 89% | 2861 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 59% | 1677 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,898 psi | 89% | 2667 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,406 psi | 90% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,130 psi | 88% | 2674 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 54,157 psi | 85% | 2733 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,877 psi | 75% | 2667 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 57,087 psi | 89% | 2641 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,593 psi | 87% | 2641 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,447 psi | 85% | 2631 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,201 psi | 85% | 2667 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 48,646 psi | 76% | 2694 fps | 100% |
| Norma MRP | <<locked>> | 88% | 56,405 psi | 88% | 2766 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,390 psi | 87% | 2657 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,201 psi | 87% | 2759 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 54,128 psi | 85% | 2664 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,537 psi | 90% | 2749 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 1716 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,203 psi | 90% | 2697 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,622 psi | 87% | 2723 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,435 psi | 90% | 2858 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,695 psi | 89% | 2825 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 54,969 psi | 86% | 2657 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 57,116 psi | 90% | 2723 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,087 psi | 89% | 2641 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,593 psi | 87% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,057 psi | 88% | 2598 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,710 psi | 89% | 2717 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,333 psi | 88% | 2654 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 56,579 psi | 89% | 2661 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,464 psi | 90% | 2694 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,000 psi | 89% | 2648 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,203 psi | 90% | 2680 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,941 psi | 88% | 2700 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 56,130 psi | 88% | 2654 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,391 psi | 88% | 2690 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,985 psi | 88% | 2769 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 56,318 psi | 88% | 2759 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 57,464 psi | 90% | 2822 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 54,418 psi | 85% | 2818 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,173 psi | 88% | 2605 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,479 psi | 90% | 2799 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,377 psi | 90% | 2694 fps | 100% |
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% | 40,437 psi | 63% | 2408 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 53,403 psi | 84% | 2621 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,713 psi | 65% | 2520 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 80% | 44,527 psi | 70% | 2526 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 39,813 psi | 62% | 2467 fps | 96.9% |
| ADI AR 2217 | <<locked>> | 84% | 33,910 psi | 53% | 2336 fps | 95% |
| ADI AR 2218 | <<locked>> | 98% | 46,702 psi | 73% | 2690 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 82% | 28,892 psi | 45% | 2247 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,111 psi | 80% | 2625 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,367 psi | 70% | 2516 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,408 psi | 63% | 2474 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,146 psi | 61% | 2425 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,866 psi | 53% | 2362 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,816 psi | 69% | 2575 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 44,179 psi | 69% | 2621 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 44,237 psi | 69% | 2500 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 37,637 psi | 59% | 2415 fps | 97.4% |
| Bofors RP30 | <<locked>> | 82% | 33,605 psi | 53% | 2352 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 40,408 psi | 63% | 2474 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 82% | 34,418 psi | 54% | 2349 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 42,322 psi | 66% | 2467 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,669 psi | 65% | 2457 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,196 psi | 76% | 2510 fps | 100% |
| Hodgdon Retumbo | 68.9 gr | 80% | 33,040 psi | 52% | 2392 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1496 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,256 psi | 79% | 2566 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 50,531 psi | 79% | 2569 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,714 psi | 69% | 2464 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 80% | 38,479 psi | 60% | 2448 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 90% | 34,214 psi | 54% | 2388 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 53,664 psi | 84% | 2592 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,228 psi | 82% | 2592 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,954 psi | 55% | 2293 fps | 98.8% |
| Norma 204 | <<locked>> | 80% | 50,836 psi | 80% | 2615 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 30,182 psi | 47% | 2303 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 42,612 psi | 67% | 2539 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 51,967 psi | 81% | 2608 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,276 psi | 60% | 2457 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 80% | 50,850 psi | 80% | 2615 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,214 psi | 54% | 2346 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 45% | 1532 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,476 psi | 84% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,851 psi | 81% | 2667 fps | 100% |
| ReloadSwiss RS 76 | 73.8 gr | 80% | 32,111 psi | 50% | 2369 fps | 97.5% |
| ReloadSwiss RS 80 | 81.8 gr | 88% | 38,943 psi | 61% | 2507 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 45,527 psi | 71% | 2503 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 43,976 psi | 69% | 2510 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,664 psi | 84% | 2592 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,228 psi | 82% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,591 psi | 82% | 2549 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,627 psi | 68% | 2503 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 46,209 psi | 72% | 2493 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 49,574 psi | 78% | 2566 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,440 psi | 70% | 2490 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 53,287 psi | 84% | 2598 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,682 psi | 61% | 2372 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 94% | 52,301 psi | 82% | 2641 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 52,562 psi | 82% | 2605 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,685 psi | 68% | 2497 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,467 psi | 67% | 2533 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 80% | 35,201 psi | 55% | 2365 fps | 95% |
| Vihtavuori N568 | <<locked>> | 88% | 40,393 psi | 63% | 2523 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 94% | 47,152 psi | 74% | 2690 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,605 psi | 82% | 2559 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,550 psi | 57% | 2474 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,785 psi | 64% | 2425 fps | 98.3% |
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 66 powders for .300 Weath. Mag. loaded with the .308 | 220gr | Remington SP Core-Lokt. Hodgdon Retumbo delivers the highest muzzle velocity at 2,861 fps; across all powders the maximum-charge window runs from 1,677 fps to 2,861 fps. ADI AR 2218 gives the best case fill at 100 %, and 66 of the 66 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, 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 2218, ADI AR 2225, Alliant Reloder-33 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, ReloadSwiss RS 80 rank at the top here: for .300 Weath. Mag. with the .308 | 220gr | Remington SP Core-Lokt 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.