Load Specifications
Load data in caliber .30-378 Weath. Mag. with .308 | 180gr | Barnes XLC BT bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 84% | 56,927 psi | 89% | 3028 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 3051 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 82% | 55,303 psi | 87% | 3136 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 56,637 psi | 89% | 3107 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,390 psi | 87% | 3123 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 92% | 54,708 psi | 86% | 3107 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,201 psi | 87% | 3235 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 94% | 54,404 psi | 85% | 3140 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,202 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,333 psi | 88% | 3123 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,795 psi | 86% | 3028 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,245 psi | 87% | 3107 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,479 psi | 90% | 3219 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,389 psi | 85% | 3153 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,259 psi | 87% | 3074 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 55,738 psi | 87% | 3114 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,448 psi | 87% | 3133 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,333 psi | 88% | 3123 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,028 psi | 88% | 3127 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,186 psi | 85% | 3048 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,898 psi | 89% | 3094 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,462 psi | 85% | 3199 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,203 psi | 60% | 2005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,505 psi | 85% | 3028 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 84% | 54,172 psi | 85% | 3110 fps | 99.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,580 psi | 90% | 3182 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,463 psi | 87% | 3009 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,434 psi | 87% | 3150 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,492 psi | 89% | 3140 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,419 psi | 87% | 3133 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,114 psi | 85% | 3061 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,247 psi | 62% | 2051 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,259 psi | 87% | 3186 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,868 psi | 86% | 3156 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 56,927 psi | 89% | 3071 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 56,478 psi | 89% | 3091 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3064 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,115 psi | 88% | 3087 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,826 psi | 89% | 3058 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,782 psi | 89% | 3045 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,275 psi | 88% | 3074 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 56,971 psi | 89% | 3064 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,680 psi | 87% | 3143 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 88% | 57,435 psi | 90% | 3146 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 55,332 psi | 87% | 3156 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 92% | 56,536 psi | 89% | 3225 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,637 psi | 87% | 3130 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,347 psi | 88% | 3051 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% | 50,111 psi | 79% | 2923 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 44,817 psi | 70% | 2920 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 51,677 psi | 81% | 3071 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 53,113 psi | 83% | 3048 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,472 psi | 76% | 2999 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 36,985 psi | 58% | 2746 fps | 97.1% |
| ADI AR 2218 | 106.1 gr | 90% | 44,802 psi | 70% | 3015 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 34,519 psi | 54% | 2730 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,866 psi | 83% | 3035 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,545 psi | 78% | 3005 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,370 psi | 76% | 2927 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,612 psi | 67% | 2887 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,366 psi | 68% | 2943 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,193 psi | 69% | 2953 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,774 psi | 72% | 2894 fps | 96.5% |
| Bofors RP15 | <<locked>> | 80% | 46,383 psi | 73% | 2943 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 40,219 psi | 63% | 2831 fps | 98% |
| Bofors RP5 | <<locked>> | 80% | 49,545 psi | 78% | 3005 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,030 psi | 63% | 2822 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 80% | 50,879 psi | 80% | 2992 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,995 psi | 78% | 2976 fps | 99% |
| Hodgdon Retumbo | 89 gr | 80% | 41,626 psi | 65% | 2949 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,747 psi | 45% | 1795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,271 psi | 80% | 2969 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 47,369 psi | 74% | 2986 fps | 99.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,387 psi | 51% | 2654 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 43,743 psi | 69% | 2805 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,909 psi | 52% | 2687 fps | 97.7% |
| Norma MRP | <<locked>> | 80% | 52,837 psi | 83% | 3081 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,138 psi | 75% | 3005 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 43,845 psi | 69% | 2881 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,617 psi | 46% | 1837 fps | 100% |
| ReloadSwiss RS 76 | 95.3 gr | 80% | 41,423 psi | 65% | 2930 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,551 psi | 60% | 2822 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 53,505 psi | 84% | 3015 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 53,011 psi | 83% | 3035 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 47,036 psi | 74% | 2943 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,649 psi | 83% | 3028 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,505 psi | 84% | 3002 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,007 psi | 74% | 2881 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 49,574 psi | 78% | 2953 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 53,563 psi | 84% | 3012 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,156 psi | 82% | 3081 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 44,483 psi | 70% | 2907 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 80% | 39,523 psi | 62% | 2835 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 86% | 46,093 psi | 72% | 3022 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,196 psi | 76% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,516 psi | 78% | 2936 fps | 99.8% |
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 55 powders for .30-378 Weath. Mag. loaded with the .308 | 180gr | Barnes XLC BT. ADI AR 2218 delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,235 fps. Accurate 8700 gives the best case fill at 100 %, and 55 of the 55 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. ADI AR 2218, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .30-378 Weath. Mag. with the .308 | 180gr | Barnes XLC BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT 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.