Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 220gr | Alaska Bullet Works Kodiak PP SPBC bullet and 72 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% | 55,434 psi | 87% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,768 psi | 89% | 2654 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 53,969 psi | 85% | 2726 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 90% | 57,232 psi | 90% | 2713 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 55,114 psi | 86% | 2723 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 2694 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,456 psi | 74% | 2661 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,740 psi | 90% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,768 psi | 89% | 2707 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,303 psi | 87% | 2720 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,840 psi | 89% | 2687 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,304 psi | 88% | 2753 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,377 psi | 90% | 2776 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 49,342 psi | 77% | 2707 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,434 psi | 88% | 2694 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 54,505 psi | 85% | 2710 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 2762 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 55,303 psi | 87% | 2720 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 54,998 psi | 86% | 2602 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,476 psi | 85% | 2717 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,534 psi | 85% | 2654 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,927 psi | 89% | 2667 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 54,955 psi | 86% | 2667 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,537 psi | 90% | 2703 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,696 psi | 90% | 2628 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,042 psi | 86% | 2825 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,592 psi | 86% | 2690 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,434 psi | 59% | 1647 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,710 psi | 89% | 2644 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,289 psi | 88% | 2621 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,898 psi | 89% | 2644 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,724 psi | 87% | 2648 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 94% | 56,884 psi | 89% | 2759 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,975 psi | 67% | 2572 fps | 97.9% |
| Lovex S065 | <<locked>> | 84% | 57,043 psi | 89% | 2621 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,303 psi | 87% | 2621 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,594 psi | 89% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 84% | 53,954 psi | 85% | 2644 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 43,453 psi | 68% | 2602 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 55,158 psi | 86% | 2740 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,882 psi | 86% | 2635 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 53,954 psi | 85% | 2726 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 57,435 psi | 90% | 2697 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,101 psi | 88% | 2717 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1686 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,521 psi | 89% | 2677 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,940 psi | 86% | 2703 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,622 psi | 87% | 2822 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2782 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 54,650 psi | 86% | 2635 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 56,507 psi | 89% | 2697 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 54,998 psi | 86% | 2602 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,043 psi | 89% | 2621 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,303 psi | 87% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,130 psi | 88% | 2579 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,086 psi | 88% | 2694 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,072 psi | 88% | 2631 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 55,782 psi | 87% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,869 psi | 89% | 2667 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,261 psi | 90% | 2562 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,724 psi | 89% | 2628 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,434 psi | 88% | 2654 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 55,782 psi | 87% | 2635 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,361 psi | 87% | 2664 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,882 psi | 86% | 2736 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 55,085 psi | 86% | 2726 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,695 psi | 87% | 2785 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,489 psi | 82% | 2772 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,825 psi | 87% | 2585 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,534 psi | 85% | 2654 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,056 psi | 86% | 2769 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,739 psi | 89% | 2667 fps | 99.9% |
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% | 37,260 psi | 58% | 2336 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 49,603 psi | 78% | 2552 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 40,901 psi | 64% | 2493 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 41,147 psi | 64% | 2448 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 36,840 psi | 58% | 2388 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 35,665 psi | 56% | 2362 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 84% | 28,311 psi | 44% | 2218 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,413 psi | 74% | 2556 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,292 psi | 65% | 2444 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,159 psi | 58% | 2395 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,882 psi | 56% | 2356 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,009 psi | 49% | 2283 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,465 psi | 62% | 2493 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 45,934 psi | 72% | 2644 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 46,818 psi | 73% | 2530 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 34,592 psi | 54% | 2339 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 34,809 psi | 55% | 2375 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 37,159 psi | 58% | 2395 fps | 97.1% |
| Bofors RP7 | <<locked>> | 80% | 51,605 psi | 81% | 2552 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 33,939 psi | 53% | 2323 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 50,937 psi | 80% | 2602 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 53,432 psi | 84% | 2615 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 39,276 psi | 62% | 2392 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,609 psi | 61% | 2379 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,715 psi | 70% | 2448 fps | 100% |
| Hodgdon Retumbo | 65.5 gr | 82% | 32,358 psi | 51% | 2362 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 50,908 psi | 80% | 2635 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,007 psi | 44% | 1467 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,920 psi | 74% | 2493 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,881 psi | 83% | 2572 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,050 psi | 74% | 2503 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,799 psi | 64% | 2392 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 82% | 37,884 psi | 59% | 2421 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,375 psi | 55% | 2408 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 50,517 psi | 79% | 2526 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,950 psi | 77% | 2526 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,126 psi | 50% | 2221 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 47,152 psi | 74% | 2536 fps | 99% |
| Norma 217 | <<locked>> | 90% | 31,024 psi | 49% | 2323 fps | 96% |
| Norma MRP | <<locked>> | 80% | 38,885 psi | 61% | 2461 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 48,356 psi | 76% | 2539 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,056 psi | 55% | 2372 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 47,079 psi | 74% | 2543 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,256 psi | 49% | 2264 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 45% | 1503 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,429 psi | 77% | 2575 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,587 psi | 75% | 2595 fps | 100% |
| ReloadSwiss RS 76 | 68.4 gr | 80% | 29,240 psi | 46% | 2274 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,466 psi | 63% | 2536 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 42,482 psi | 67% | 2428 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 40,683 psi | 64% | 2431 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 80% | 51,605 psi | 81% | 2552 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,517 psi | 79% | 2526 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,950 psi | 77% | 2526 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,371 psi | 77% | 2480 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,350 psi | 63% | 2428 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 43,091 psi | 68% | 2418 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 45,571 psi | 71% | 2497 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,249 psi | 65% | 2415 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 80% | 53,679 psi | 84% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,835 psi | 78% | 2533 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,810 psi | 56% | 2303 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 80% | 49,139 psi | 77% | 2539 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,132 psi | 63% | 2425 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 38,928 psi | 61% | 2451 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 36,840 psi | 58% | 2395 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 92% | 41,989 psi | 66% | 2549 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 49,066 psi | 77% | 2717 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,762 psi | 76% | 2493 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,111 psi | 80% | 2605 fps | 100% |
| Winchester StaBALL HD | 65.6 gr | 80% | 32,213 psi | 50% | 2388 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,623 psi | 59% | 2346 fps | 97.1% |
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 78 powders for .300 Weath. Mag. loaded with the .308 | 220gr | Alaska Bullet Works Kodiak PP SPBC. Hodgdon Retumbo delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,647 fps to 2,825 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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 Weath. Mag. with the .308 | 220gr | Alaska Bullet Works Kodiak PP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.