Load Specifications
Load data in caliber .338-378 Weath. Mag. with .338 | 165gr | TPM XTLD bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and ADI AR 2213.
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>> | 96% | 55,419 psi | 87% | 3307 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 56,521 psi | 89% | 3366 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 53,983 psi | 85% | 3396 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 82% | 54,288 psi | 85% | 3278 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,682 psi | 90% | 3415 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 55,361 psi | 87% | 3406 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,263 psi | 65% | 3150 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,405 psi | 87% | 3301 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,232 psi | 90% | 3428 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,911 psi | 86% | 3386 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,145 psi | 90% | 3402 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,172 psi | 86% | 3402 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,217 psi | 88% | 3386 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 3376 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,927 psi | 89% | 3481 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,157 psi | 85% | 3383 fps | 98.3% |
| Bofors RP3 | <<locked>> | 82% | 56,681 psi | 89% | 3320 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,979 psi | 75% | 3287 fps | 96.6% |
| Bofors RP5 | <<locked>> | 96% | 55,172 psi | 86% | 3402 fps | 98.6% |
| Bofors RP7 | <<locked>> | 86% | 55,579 psi | 87% | 3307 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,329 psi | 80% | 3314 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 82% | 56,724 psi | 89% | 3340 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,650 psi | 86% | 3356 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 57,508 psi | 90% | 3376 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 94% | 55,448 psi | 87% | 3343 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,331 psi | 85% | 3323 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,696 psi | 90% | 3337 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,850 psi | 80% | 3432 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 86% | 55,419 psi | 87% | 3392 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,709 psi | 58% | 2169 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,116 psi | 90% | 3314 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,232 psi | 90% | 3343 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,188 psi | 90% | 3333 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 57,000 psi | 89% | 3353 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,608 psi | 89% | 3330 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 98% | 57,014 psi | 89% | 3451 fps | 97.9% |
| Lovex S062 | <<locked>> | 82% | 57,537 psi | 90% | 3307 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,711 psi | 90% | 3333 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,767 psi | 87% | 3320 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 3264 fps | 99.6% |
| Norma 204 | <<locked>> | 88% | 54,592 psi | 86% | 3337 fps | 98.2% |
| Norma MRP | <<locked>> | 94% | 55,100 psi | 86% | 3432 fps | 99.5% |
| Norma URP | <<locked>> | 88% | 55,013 psi | 86% | 3346 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 53,621 psi | 84% | 3396 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 90% | 57,740 psi | 90% | 3406 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,347 psi | 88% | 3392 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 59% | 2221 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,478 psi | 89% | 3317 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,114 psi | 85% | 3376 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,782 psi | 89% | 3386 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,129 psi | 86% | 3415 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,779 psi | 81% | 3428 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 56,840 psi | 89% | 3317 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,216 psi | 87% | 3317 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 94% | 56,434 psi | 88% | 3386 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 55,579 psi | 87% | 3307 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,711 psi | 90% | 3333 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,537 psi | 90% | 3307 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,767 psi | 87% | 3320 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,665 psi | 86% | 3317 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,797 psi | 89% | 3182 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,334 psi | 90% | 3278 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,970 psi | 88% | 3379 fps | 98.7% |
| Somchem S355 | <<locked>> | 84% | 56,463 psi | 88% | 3310 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,261 psi | 90% | 3304 fps | 97.2% |
| Somchem S365 | <<locked>> | 90% | 55,172 psi | 86% | 3346 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,174 psi | 90% | 3356 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 84% | 54,288 psi | 85% | 3222 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,869 psi | 89% | 3337 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,782 psi | 89% | 3327 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 88% | 56,246 psi | 88% | 3340 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,737 psi | 86% | 3360 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,027 psi | 86% | 3419 fps | 97.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 3386 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,927 psi | 89% | 3287 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,839 psi | 86% | 3360 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,403 psi | 84% | 3465 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,421 psi | 90% | 3350 fps | 98.8% |
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>> | 82% | 34,011 psi | 53% | 2858 fps | 95.3% |
| Accurate 4350 | <<locked>> | 80% | 42,815 psi | 67% | 3107 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 92% | 50,154 psi | 79% | 3323 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 50,937 psi | 80% | 3215 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 43,990 psi | 69% | 3146 fps | 95.8% |
| ADI AR 2213 | 109 gr | 92% | 48,269 psi | 76% | 3268 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 96% | 36,143 psi | 57% | 3005 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,967 psi | 81% | 3245 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,959 psi | 64% | 3114 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,442 psi | 74% | 3258 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 43,801 psi | 69% | 3136 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 41,930 psi | 66% | 3133 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,414 psi | 48% | 2828 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,576 psi | 51% | 2907 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,185 psi | 52% | 2966 fps | 96.5% |
| Bofors RP15 | <<locked>> | 90% | 41,365 psi | 65% | 3117 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 52,924 psi | 83% | 3261 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 44,759 psi | 70% | 3219 fps | 95.6% |
| Bofors RP5 | <<locked>> | 88% | 41,930 psi | 66% | 3133 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 45,890 psi | 72% | 3117 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 96% | 44,512 psi | 70% | 3166 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 53,026 psi | 83% | 3274 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,541 psi | 70% | 3156 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 47,224 psi | 74% | 3179 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 90% | 48,225 psi | 76% | 3205 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 92% | 50,676 psi | 79% | 3255 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,609 psi | 61% | 2986 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 94% | 41,568 psi | 65% | 3209 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 44,135 psi | 69% | 3173 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 43% | 1949 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,592 psi | 84% | 3255 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,510 psi | 65% | 3035 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,239 psi | 74% | 3150 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 40,857 psi | 64% | 3048 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 49,763 psi | 78% | 3202 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 46,224 psi | 72% | 3235 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 54,012 psi | 85% | 3248 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,817 psi | 70% | 3094 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 43,207 psi | 68% | 3074 fps | 97.5% |
| Lovex S071 | <<locked>> | 86% | 33,228 psi | 52% | 2838 fps | 95% |
| Norma 204 | <<locked>> | 82% | 44,266 psi | 69% | 3130 fps | 95.8% |
| Norma MRP | 102.7 gr | 84% | 38,218 psi | 60% | 3074 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 42,163 psi | 66% | 3094 fps | 99% |
| Ramshot Grand | <<locked>> | 92% | 46,296 psi | 73% | 3245 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 41,031 psi | 64% | 3077 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 90% | 38,479 psi | 60% | 3025 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 44% | 1995 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,765 psi | 83% | 3255 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,343 psi | 79% | 3314 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,830 psi | 67% | 3127 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,191 psi | 65% | 3136 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 38,508 psi | 60% | 3110 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 49,835 psi | 78% | 3202 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,426 psi | 71% | 3123 fps | 95% |
| Rottweil R 905 | <<locked>> | 86% | 42,989 psi | 67% | 3120 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 45,890 psi | 72% | 3117 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,817 psi | 70% | 3094 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 54,012 psi | 85% | 3248 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,207 psi | 68% | 3074 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,097 psi | 80% | 3258 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,154 psi | 79% | 3081 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,005 psi | 69% | 3031 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 42,612 psi | 67% | 3114 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 49,676 psi | 78% | 3196 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,995 psi | 78% | 3173 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 38,885 psi | 61% | 3048 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 38,247 psi | 60% | 2972 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 47,645 psi | 75% | 3110 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,584 psi | 68% | 3094 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 40,379 psi | 63% | 3009 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 43,047 psi | 67% | 3094 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 34,040 psi | 53% | 2920 fps | 97.6% |
| Vihtavuori N560 | 110.1 gr | 90% | 47,674 psi | 75% | 3274 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 96% | 47,645 psi | 75% | 3248 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,801 psi | 67% | 3048 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,701 psi | 70% | 3159 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,050 psi | 42% | 2805 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 88% | 43,207 psi | 68% | 3081 fps | 95.7% |
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 .338-378 Weath. Mag. loaded with the .338 | 165gr | TPM XTLD. Alliant Reloder-26 delivers the highest muzzle velocity at 3,481 fps; across all powders the maximum-charge window runs from 2,169 fps to 3,481 fps. ADI AR 2225 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 58–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP30 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. Norma MRP, Vihtavuori N560, ADI AR 2213 rank at the top here: for .338-378 Weath. Mag. with the .338 | 165gr | TPM XTLD 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.