Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:230 gr
Bullet Diameter:0.376"
Bullet Length:<<locked>>
Caliber:.378 Weath. Mag. load data
Case Length (l3):2.913"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:137 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:16.5
Load data in caliber .378 Weath. Mag. with .376 | 230gr | Peregrine VLR-4 bullet and 108 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Hodgdon Superformance.
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 2015 | <<locked>> | 82% | 57,595 psi | 90% | 2979 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,043 psi | 89% | 3009 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,738 psi | 87% | 3028 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,602 psi | 76% | 2995 fps | 98.7% |
| Accurate 4064 | <<locked>> | 88% | 57,421 psi | 90% | 3068 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,520 psi | 85% | 3120 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 53,505 psi | 84% | 3205 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 84% | 57,188 psi | 90% | 3107 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,853 psi | 86% | 3054 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 3166 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,927 psi | 88% | 3048 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,479 psi | 90% | 3012 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,824 psi | 84% | 3179 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 56,173 psi | 88% | 3159 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,303 psi | 87% | 3077 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,709 psi | 87% | 3100 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,724 psi | 87% | 3186 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,174 psi | 90% | 3215 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,332 psi | 87% | 3150 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,733 psi | 76% | 3081 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,832 psi | 72% | 3025 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,045 psi | 63% | 2923 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3222 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,319 psi | 90% | 3123 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,115 psi | 88% | 3094 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,733 psi | 76% | 3081 fps | 96.6% |
| Bofors RP7 | <<locked>> | 92% | 55,666 psi | 87% | 3071 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,261 psi | 90% | 3025 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,796 psi | 87% | 3081 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,739 psi | 89% | 3114 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 57,290 psi | 90% | 3179 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 92% | 57,305 psi | 90% | 3136 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 82% | 54,273 psi | 85% | 3061 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,796 psi | 87% | 3100 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,288 psi | 85% | 3097 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,911 psi | 84% | 3156 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 56% | 1919 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,477 psi | 87% | 3064 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,607 psi | 86% | 3038 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,302 psi | 85% | 3038 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,276 psi | 90% | 3071 fps | 99% |
| IMR 4350 | <<locked>> | 96% | 56,710 psi | 89% | 3107 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,653 psi | 90% | 3107 fps | 99.1% |
| IMR 4831 | <<locked>> | 96% | 55,230 psi | 87% | 3114 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,159 psi | 90% | 3133 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,869 psi | 88% | 3087 fps | 96% |
| IMR 8208 XBR | <<locked>> | 82% | 55,927 psi | 88% | 3048 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,406 psi | 90% | 3074 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,231 psi | 88% | 3025 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,273 psi | 85% | 3028 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,334 psi | 90% | 3097 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 54,998 psi | 86% | 3084 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,103 psi | 63% | 2828 fps | 96.8% |
| Norma 201 | <<locked>> | 84% | 55,709 psi | 87% | 3041 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,550 psi | 89% | 3041 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,940 psi | 86% | 3087 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,653 psi | 90% | 3163 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 51,721 psi | 81% | 3173 fps | 98.5% |
| Norma URP | <<locked>> | 96% | 57,246 psi | 90% | 3163 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,883 psi | 88% | 3114 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,115 psi | 88% | 3163 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 56,173 psi | 88% | 3074 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,173 psi | 88% | 3091 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,477 psi | 57% | 1962 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,855 psi | 89% | 3094 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,681 psi | 89% | 3176 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,739 psi | 89% | 3209 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,563 psi | 86% | 3146 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,522 psi | 90% | 3241 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 56,188 psi | 88% | 3015 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,304 psi | 88% | 3041 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,985 psi | 88% | 3087 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,331 psi | 85% | 3074 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,230 psi | 85% | 3130 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 92% | 55,666 psi | 87% | 3071 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,334 psi | 90% | 3097 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,406 psi | 90% | 3074 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,273 psi | 85% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,998 psi | 86% | 3084 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,331 psi | 85% | 3097 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,810 psi | 86% | 3051 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,666 psi | 87% | 3074 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,782 psi | 89% | 2972 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,667 psi | 90% | 2969 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,508 psi | 90% | 3051 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 3123 fps | 97.6% |
| Somchem S335 | <<locked>> | 84% | 56,405 psi | 88% | 2969 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,563 psi | 86% | 3038 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,173 psi | 88% | 3084 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 56,304 psi | 88% | 3064 fps | 95.8% |
| Somchem S365 | <<locked>> | 98% | 56,173 psi | 88% | 3163 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,027 psi | 86% | 3107 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 84% | 57,290 psi | 90% | 2953 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,492 psi | 89% | 2999 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,232 psi | 90% | 3018 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,653 psi | 90% | 3054 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,840 psi | 88% | 3104 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,384 psi | 74% | 2956 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 82% | 56,434 psi | 88% | 3048 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,376 psi | 87% | 3015 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,926 psi | 86% | 3107 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,140 psi | 80% | 3104 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,840 psi | 88% | 3071 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,985 psi | 89% | 3100 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,595 psi | 90% | 3182 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,205 psi | 65% | 3064 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,738 psi | 87% | 3081 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,663 psi | 81% | 3038 fps | 96.9% |
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 2015 | <<locked>> | 80% | 54,157 psi | 85% | 2933 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,688 psi | 73% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,600 psi | 71% | 2851 fps | 96.3% |
| Accurate 3100 | <<locked>> | 92% | 36,550 psi | 57% | 2749 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 44,222 psi | 69% | 2858 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,185 psi | 52% | 2687 fps | 96.3% |
| Accurate High Country | <<locked>> | 98% | 49,763 psi | 78% | 3140 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 50,357 psi | 79% | 2992 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,728 psi | 67% | 2835 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 46,064 psi | 72% | 2976 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,489 psi | 82% | 2995 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,853 psi | 84% | 2966 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,601 psi | 73% | 3048 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,934 psi | 72% | 2976 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,743 psi | 67% | 2858 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,847 psi | 72% | 2930 fps | 99.6% |
| Alliant Reloder-16 | 86.2 gr | 80% | 33,141 psi | 52% | 2707 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,333 psi | 59% | 2844 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,339 psi | 71% | 2966 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,440 psi | 71% | 3015 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,166 psi | 43% | 2549 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,201 psi | 55% | 2795 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,562 psi | 53% | 2802 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,053 psi | 78% | 3005 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 42,641 psi | 67% | 2864 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 45,440 psi | 71% | 3015 fps | 95.7% |
| Bofors RP7 | <<locked>> | 82% | 40,480 psi | 63% | 2779 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,809 psi | 84% | 2972 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,982 psi | 81% | 3022 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,337 psi | 68% | 2874 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 82% | 38,014 psi | 60% | 2805 fps | 95% |
| Hodgdon H4350 | <<locked>> | 84% | 44,164 psi | 69% | 2897 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 50,879 psi | 80% | 3005 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,501 psi | 48% | 2595 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,326 psi | 74% | 2979 fps | 100% |
| Hodgdon Superformance | 103 gr | 84% | 40,118 psi | 63% | 2881 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 42% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,747 psi | 76% | 2953 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,155 psi | 80% | 2986 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,904 psi | 70% | 2871 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,239 psi | 74% | 2897 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 41,147 psi | 64% | 2815 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,494 psi | 62% | 2759 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 32,169 psi | 50% | 2644 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 47,036 psi | 74% | 2963 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,373 psi | 82% | 3028 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 52,489 psi | 82% | 2995 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,154 psi | 79% | 2966 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,705 psi | 78% | 2920 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,904 psi | 70% | 2871 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,782 psi | 58% | 2700 fps | 96% |
| Lovex S070 | <<locked>> | 82% | 37,391 psi | 59% | 2733 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 35,056 psi | 55% | 2713 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,965 psi | 77% | 2933 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,661 psi | 78% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,194 psi | 71% | 2917 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 46,847 psi | 73% | 2972 fps | 95.6% |
| Norma MRP | <<locked>> | 92% | 38,885 psi | 61% | 2900 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 33,431 psi | 52% | 2690 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 45,281 psi | 71% | 2933 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 37,260 psi | 58% | 2795 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 52,518 psi | 82% | 3015 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,402 psi | 82% | 3031 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 43% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,555 psi | 68% | 2854 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,168 psi | 77% | 3051 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,740 psi | 62% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,996 psi | 52% | 2703 fps | 95.8% |
| ReloadSwiss RS 70 | 96.6 gr | 82% | 35,027 psi | 55% | 2776 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 52,895 psi | 83% | 2966 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,630 psi | 73% | 2884 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,089 psi | 63% | 2805 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 50,850 psi | 80% | 3012 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 94% | 44,164 psi | 69% | 2946 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 82% | 40,480 psi | 63% | 2779 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,782 psi | 58% | 2700 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,154 psi | 79% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,904 psi | 70% | 2871 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,391 psi | 59% | 2733 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,336 psi | 65% | 2861 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,053 psi | 80% | 2989 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,762 psi | 76% | 2959 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,227 psi | 79% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,148 psi | 66% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,566 psi | 60% | 2700 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 43,743 psi | 69% | 2936 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 49,763 psi | 78% | 2867 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,908 psi | 80% | 2979 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,640 psi | 64% | 2808 fps | 99.5% |
| Somchem S361 | <<locked>> | 96% | 52,663 psi | 83% | 3005 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 29,936 psi | 47% | 2638 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 41,916 psi | 66% | 2864 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 50,763 psi | 80% | 2861 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,731 psi | 73% | 2854 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,123 psi | 74% | 2864 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,841 psi | 61% | 2736 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 34,867 psi | 55% | 2694 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 98% | 44,280 psi | 69% | 2900 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 52,721 psi | 83% | 2989 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,455 psi | 71% | 2858 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,316 psi | 54% | 2690 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 29,559 psi | 46% | 2628 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,345 psi | 54% | 2667 fps | 98.6% |
| Winchester 748 | <<locked>> | 80% | 53,243 psi | 83% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 38,116 psi | 60% | 2808 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,311 psi | 43% | 2635 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,718 psi | 76% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 44,788 psi | 70% | 2913 fps | 95.2% |
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 108 powders for .378 Weath. Mag. loaded with the .376 | 230gr | Peregrine VLR-4. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,241 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 230.0 gr projectile in 0.376" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, ADI AR 2209 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. ReloadSwiss RS 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .378 Weath. Mag. with the .376 | 230gr | Peregrine VLR-4 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.