Load Specifications
Load data in caliber .338-378 Weath. Mag. with .338 | 190gr | Hammer HHT bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP and Vihtavuori N560.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 54,926 psi | 86% | 3123 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,999 psi | 88% | 3166 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,363 psi | 90% | 3281 fps | 98% |
| ADI AR 2208 | <<locked>> | 82% | 56,797 psi | 89% | 3123 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,913 psi | 89% | 3222 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 54,636 psi | 86% | 3219 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,110 psi | 77% | 3104 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,830 psi | 69% | 3058 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,014 psi | 89% | 3215 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,855 psi | 89% | 3225 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,157 psi | 85% | 3179 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,318 psi | 88% | 3205 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,679 psi | 86% | 3219 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,912 psi | 88% | 3192 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,303 psi | 87% | 3251 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,565 psi | 89% | 3284 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,710 psi | 89% | 3176 fps | 96.1% |
| Bofors RP15 | <<locked>> | 98% | 57,479 psi | 90% | 3261 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3179 fps | 98.4% |
| Bofors RP5 | <<locked>> | 94% | 54,679 psi | 86% | 3219 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 54,752 psi | 86% | 3107 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,230 psi | 85% | 3202 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 86% | 57,682 psi | 90% | 3219 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,623 psi | 89% | 3176 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 54,534 psi | 85% | 3153 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,246 psi | 90% | 3199 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,145 psi | 90% | 3136 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,128 psi | 85% | 3323 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 54,404 psi | 85% | 3192 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 58% | 2021 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,405 psi | 88% | 3146 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,130 psi | 88% | 3133 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 56,333 psi | 88% | 3153 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,724 psi | 87% | 3140 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 96% | 56,318 psi | 88% | 3258 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 56,826 psi | 89% | 3130 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,955 psi | 86% | 3123 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3136 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,609 psi | 90% | 3209 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 39,363 psi | 62% | 2976 fps | 97.4% |
| Norma MRP | <<locked>> | 92% | 54,505 psi | 85% | 3238 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 54,317 psi | 85% | 3143 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,261 psi | 90% | 3284 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 57,058 psi | 89% | 3209 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,709 psi | 87% | 3209 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 59% | 2070 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,638 psi | 90% | 3225 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,086 psi | 88% | 3186 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,404 psi | 85% | 3215 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 3320 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,009 psi | 78% | 3186 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 56,014 psi | 88% | 3110 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,491 psi | 85% | 3127 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 92% | 55,796 psi | 87% | 3196 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 54,752 psi | 86% | 3107 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,826 psi | 89% | 3130 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,955 psi | 86% | 3123 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,580 psi | 90% | 3173 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,796 psi | 87% | 2976 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,173 psi | 88% | 3081 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,361 psi | 87% | 3189 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 55,637 psi | 87% | 3104 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,188 psi | 88% | 3117 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 54,781 psi | 86% | 3146 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,536 psi | 89% | 3166 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 56,898 psi | 89% | 3071 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,202 psi | 88% | 3136 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,999 psi | 88% | 3140 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 55,448 psi | 87% | 3143 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,447 psi | 85% | 3166 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,346 psi | 85% | 3232 fps | 98% |
| Vihtavuori N565 | <<locked>> | 98% | 54,404 psi | 85% | 3209 fps | 98.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,111 psi | 80% | 3196 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,767 psi | 87% | 3087 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,128 psi | 85% | 3163 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,505 psi | 84% | 3271 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,507 psi | 89% | 3159 fps | 99.3% |
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% | 33,982 psi | 53% | 2703 fps | 96.7% |
| Accurate 4350 | <<locked>> | 80% | 45,571 psi | 71% | 2986 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 46,325 psi | 73% | 3077 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 53,345 psi | 84% | 3068 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,956 psi | 59% | 2841 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 86% | 41,510 psi | 65% | 2953 fps | 95% |
| ADI AR 2217 | <<locked>> | 96% | 42,946 psi | 67% | 2972 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 92% | 33,678 psi | 53% | 2795 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,363 psi | 60% | 2844 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,482 psi | 68% | 2992 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,343 psi | 79% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,014 psi | 60% | 2838 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 84% | 38,885 psi | 61% | 2897 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,503 psi | 51% | 2736 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,313 psi | 48% | 2690 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,665 psi | 56% | 2877 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,229 psi | 83% | 3110 fps | 95.3% |
| Bofors RP15 | <<locked>> | 86% | 38,493 psi | 60% | 2887 fps | 95.5% |
| Bofors RP30 | <<locked>> | 94% | 41,655 psi | 65% | 2989 fps | 96% |
| Bofors RP5 | <<locked>> | 84% | 38,885 psi | 61% | 2897 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 48,211 psi | 76% | 2989 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 92% | 41,017 psi | 64% | 2933 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 47,152 psi | 74% | 3035 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 49,647 psi | 78% | 3051 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 44,469 psi | 70% | 2963 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 43,540 psi | 68% | 2943 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,017 psi | 64% | 2867 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,129 psi | 57% | 2907 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 46,833 psi | 73% | 3058 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,729 psi | 69% | 2913 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,603 psi | 78% | 3018 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 43,308 psi | 68% | 2927 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,120 psi | 68% | 2900 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 88% | 42,772 psi | 67% | 2992 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 47,152 psi | 74% | 2963 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 45,513 psi | 71% | 2949 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 31,154 psi | 49% | 2628 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 43,714 psi | 69% | 2949 fps | 96.9% |
| Norma 217 | <<locked>> | 96% | 34,389 psi | 54% | 2844 fps | 95.4% |
| Norma MRP | 93.8 gr | 80% | 35,433 psi | 56% | 2838 fps | 96% |
| Norma URP | <<locked>> | 80% | 44,672 psi | 70% | 2972 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 42,641 psi | 67% | 3002 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 43,540 psi | 68% | 2963 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 35,375 psi | 55% | 2799 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 44% | 1857 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,505 psi | 84% | 3166 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,556 psi | 71% | 3005 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,685 psi | 68% | 3022 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,011 psi | 52% | 2805 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,369 psi | 73% | 3117 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 52,489 psi | 82% | 3058 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 41,974 psi | 66% | 2884 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 37,260 psi | 58% | 2818 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 48,211 psi | 76% | 2989 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,152 psi | 74% | 2963 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,513 psi | 71% | 2949 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,911 psi | 84% | 3114 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,460 psi | 82% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,238 psi | 72% | 2907 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,956 psi | 58% | 2815 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 52,228 psi | 82% | 3051 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,890 psi | 72% | 2930 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 41,640 psi | 65% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,855 psi | 59% | 2802 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 80% | 50,067 psi | 78% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,122 psi | 72% | 2966 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 35,070 psi | 55% | 2723 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 45,469 psi | 71% | 2969 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,506 psi | 57% | 2818 fps | 99.2% |
| Vihtavuori N560 | 100.8 gr | 86% | 44,019 psi | 69% | 3028 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 92% | 44,150 psi | 69% | 3012 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 98% | 47,601 psi | 75% | 3127 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,281 psi | 71% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,282 psi | 74% | 3038 fps | 99.1% |
| Winchester StaBALL HD | 92.8 gr | 80% | 28,964 psi | 45% | 2743 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,086 psi | 58% | 2782 fps | 95% |
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 77 powders for .338-378 Weath. Mag. loaded with the .338 | 190gr | Hammer HHT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,323 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 190.0 gr projectile in 0.338" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, Norma MRP, Vihtavuori N560 rank at the top here: for .338-378 Weath. Mag. with the .338 | 190gr | Hammer HHT 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.