Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Sellier & Bellot XRG bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 57,101 psi | 89% | 3048 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,428 psi | 76% | 3002 fps | 96.4% |
| Accurate MAGPRO | <<locked>> | 84% | 56,173 psi | 88% | 3159 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 54,259 psi | 85% | 3077 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,753 psi | 89% | 3156 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 55,840 psi | 88% | 3136 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,420 psi | 88% | 3264 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 96% | 55,332 psi | 87% | 3159 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 54,520 psi | 85% | 3074 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,537 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,305 psi | 90% | 3150 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,637 psi | 87% | 3051 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,159 psi | 88% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,173 psi | 88% | 3140 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 54,346 psi | 85% | 3169 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,418 psi | 85% | 3159 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,971 psi | 89% | 3110 fps | 98.8% |
| Bofors RP15 | <<locked>> | 88% | 56,695 psi | 89% | 3140 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,941 psi | 88% | 3150 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,305 psi | 90% | 3150 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,276 psi | 90% | 3156 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 55,434 psi | 87% | 3081 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,476 psi | 85% | 3064 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,376 psi | 87% | 3222 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,898 psi | 59% | 2005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,738 psi | 87% | 3058 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 55,347 psi | 87% | 3140 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,317 psi | 85% | 3140 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 55,448 psi | 87% | 3022 fps | 100% |
| Norma 217 | <<locked>> | 98% | 55,666 psi | 87% | 3163 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,508 psi | 90% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,695 psi | 89% | 3163 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 55,114 psi | 86% | 3084 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,885 psi | 61% | 2051 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,304 psi | 88% | 3209 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 55,593 psi | 87% | 3173 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 54,679 psi | 86% | 3045 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 57,464 psi | 90% | 3117 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,415 psi | 79% | 3015 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,072 psi | 89% | 3114 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,956 psi | 88% | 3035 fps | 99.7% |
| Somchem S385 | <<locked>> | 84% | 57,711 psi | 90% | 3081 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,114 psi | 85% | 3012 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,217 psi | 90% | 3100 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 84% | 57,377 psi | 90% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,840 psi | 89% | 3173 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 54,302 psi | 85% | 3104 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 55,970 psi | 88% | 3176 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 94% | 57,421 psi | 90% | 3245 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,217 psi | 88% | 3146 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,551 psi | 90% | 3081 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 46,934 psi | 74% | 2881 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 44,904 psi | 70% | 2933 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 80% | 48,849 psi | 77% | 3028 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 50,807 psi | 80% | 3015 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 45,992 psi | 72% | 2959 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 34,461 psi | 54% | 2690 fps | 96% |
| ADI AR 2218 | 109.1 gr | 92% | 45,223 psi | 71% | 3031 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,807 psi | 50% | 2661 fps | 98% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,126 psi | 80% | 3015 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,647 psi | 79% | 3009 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,833 psi | 73% | 2963 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,600 psi | 71% | 2890 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,827 psi | 62% | 2838 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,170 psi | 82% | 3074 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,497 psi | 68% | 2953 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,949 psi | 74% | 3015 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,888 psi | 69% | 2861 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 43,642 psi | 68% | 2900 fps | 99.1% |
| Bofors RP30 | <<locked>> | 80% | 37,318 psi | 58% | 2776 fps | 97.1% |
| Bofors RP5 | <<locked>> | 80% | 46,833 psi | 73% | 2963 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 37,434 psi | 59% | 2769 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 80% | 48,472 psi | 76% | 2956 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,616 psi | 75% | 2940 fps | 98.7% |
| Hodgdon Retumbo | 89.5 gr | 80% | 38,841 psi | 61% | 2894 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,168 psi | 77% | 2940 fps | 99% |
| IMR 7828 SSC | <<locked>> | 80% | 44,773 psi | 70% | 2943 fps | 98.7% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,823 psi | 53% | 2700 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 40,466 psi | 63% | 2753 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 29,704 psi | 47% | 2602 fps | 96% |
| Norma MRP | <<locked>> | 80% | 49,951 psi | 78% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,397 psi | 71% | 2963 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 80% | 40,959 psi | 64% | 2828 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,298 psi | 46% | 1837 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,363 psi | 60% | 2867 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,130 psi | 60% | 2822 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 51,271 psi | 80% | 2986 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 50,386 psi | 79% | 2999 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,152 psi | 74% | 2953 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,038 psi | 78% | 2995 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,475 psi | 82% | 2976 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 50,705 psi | 79% | 2969 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,556 psi | 70% | 2844 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 49,995 psi | 78% | 2972 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 50,430 psi | 79% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,429 psi | 77% | 3038 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,510 psi | 65% | 2851 fps | 97.6% |
| Vihtavuori N568 | <<locked>> | 82% | 39,291 psi | 62% | 2838 fps | 95.6% |
| Vihtavuori N570 | 102.2 gr | 88% | 46,282 psi | 73% | 3031 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,918 psi | 70% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,920 psi | 74% | 2900 fps | 99.6% |
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 51 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Sellier & Bellot XRG. ADI AR 2218 delivers the highest muzzle velocity at 3,264 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,264 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 180.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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, ADI AR 2218, Vihtavuori N570 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Sellier & Bellot XRG 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.