Load Specifications
Bullet Manufacturer:Rhino Bullets
Bullet Weight:235 gr
Bullet Diameter:0.374"
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:1:6.0
Load data in caliber .378 Weath. Mag. with .374 | 235gr | Rhino Penetrator bullet and 103 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 Alliant Reloder-26.
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 2495 | <<locked>> | 84% | 57,450 psi | 90% | 2979 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,042 psi | 86% | 2992 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,620 psi | 82% | 3035 fps | 99.4% |
| Accurate 4064 | <<locked>> | 86% | 57,725 psi | 90% | 3035 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,868 psi | 86% | 3094 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 57,609 psi | 90% | 3245 fps | 97.7% |
| ADI AR 2206H | <<locked>> | 82% | 56,652 psi | 89% | 3068 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,725 psi | 90% | 3071 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,840 psi | 88% | 3133 fps | 98.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,505 psi | 84% | 3120 fps | 96.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,261 psi | 90% | 3205 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,854 psi | 88% | 3130 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,085 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,288 psi | 87% | 3064 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,419 psi | 87% | 3153 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,000 psi | 89% | 3182 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,056 psi | 86% | 3120 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,243 psi | 82% | 3120 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,255 psi | 77% | 3054 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,076 psi | 68% | 2969 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,840 psi | 89% | 3261 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,666 psi | 89% | 3087 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,979 psi | 75% | 3038 fps | 96.6% |
| Bofors RP3 | <<locked>> | 86% | 55,869 psi | 88% | 3058 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,243 psi | 82% | 3120 fps | 97.7% |
| Bofors RP7 | <<locked>> | 90% | 55,332 psi | 87% | 3038 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 56,391 psi | 88% | 3077 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 57,116 psi | 90% | 3150 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 90% | 56,811 psi | 89% | 3104 fps | 98.5% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3127 fps | 96.5% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,202 psi | 88% | 3107 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 82% | 57,305 psi | 90% | 3077 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,738 psi | 87% | 3068 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,551 psi | 90% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,551 psi | 90% | 3189 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,230 psi | 57% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,781 psi | 86% | 3022 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,217 psi | 90% | 3051 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,420 psi | 88% | 3035 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 56,173 psi | 88% | 3071 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,058 psi | 89% | 3071 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 55,216 psi | 87% | 3081 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,695 psi | 89% | 3094 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,361 psi | 87% | 3058 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 82% | 57,116 psi | 90% | 3038 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,317 psi | 87% | 2986 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,348 psi | 90% | 3045 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,043 psi | 89% | 3064 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 54,824 psi | 86% | 3051 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,569 psi | 68% | 2874 fps | 98% |
| Norma 201 | <<locked>> | 82% | 55,361 psi | 87% | 3005 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,057 psi | 88% | 3002 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,592 psi | 86% | 3051 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,232 psi | 90% | 3133 fps | 98.1% |
| Norma MRPᴾ | <<locked>> | 100% | 55,608 psi | 87% | 3212 fps | 99.3% |
| Norma URP | <<locked>> | 94% | 57,159 psi | 90% | 3133 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,347 psi | 87% | 3077 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,155 psi | 80% | 3104 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 94% | 55,985 psi | 88% | 3133 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,614 psi | 71% | 2969 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,333 psi | 88% | 3058 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,318 psi | 88% | 3136 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,405 psi | 88% | 3173 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,636 psi | 86% | 3117 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,058 psi | 89% | 3205 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,105 psi | 66% | 2982 fps | 96.7% |
| Rottweil R 902 | <<locked>> | 84% | 55,941 psi | 88% | 3005 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,043 psi | 88% | 3054 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,696 psi | 90% | 3104 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 98% | 54,317 psi | 85% | 3107 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 55,332 psi | 87% | 3038 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,043 psi | 89% | 3064 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,116 psi | 90% | 3038 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,348 psi | 90% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,824 psi | 86% | 3051 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,682 psi | 90% | 3117 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,085 psi | 86% | 3035 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,072 psi | 88% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,000 psi | 89% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,971 psi | 89% | 3015 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,464 psi | 90% | 3159 fps | 98.5% |
| Somchem S335 | <<locked>> | 82% | 55,912 psi | 88% | 2930 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,638 psi | 90% | 3054 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,956 psi | 88% | 3051 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,840 psi | 88% | 3035 fps | 96.2% |
| Somchem S365 | <<locked>> | 96% | 56,362 psi | 88% | 3133 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,940 psi | 86% | 3081 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 56,565 psi | 89% | 2913 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,347 psi | 88% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,594 psi | 89% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,348 psi | 90% | 3022 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,767 psi | 87% | 3071 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,792 psi | 80% | 2992 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 84% | 54,824 psi | 86% | 2976 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,795 psi | 86% | 3074 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 3136 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,985 psi | 88% | 3199 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,477 psi | 87% | 3038 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,319 psi | 90% | 3153 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,628 psi | 70% | 3110 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,216 psi | 87% | 3045 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3074 fps | 97.9% |
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 2495 | <<locked>> | 80% | 50,343 psi | 79% | 2877 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,269 psi | 76% | 2877 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 34,809 psi | 55% | 2680 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 47,674 psi | 75% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,158 psi | 57% | 2733 fps | 97.6% |
| Accurate High Country | <<locked>> | 94% | 46,528 psi | 73% | 3045 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 53,142 psi | 83% | 3012 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,179 psi | 71% | 2858 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 45,876 psi | 72% | 2949 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 98% | 50,009 psi | 78% | 3054 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,705 psi | 78% | 3081 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,062 psi | 67% | 2890 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,513 psi | 71% | 2881 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,660 psi | 76% | 2953 fps | 99.9% |
| Alliant Reloder-16 | 88 gr | 80% | 35,462 psi | 56% | 2746 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,030 psi | 63% | 2877 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,569 psi | 67% | 2881 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,815 psi | 67% | 2933 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,673 psi | 43% | 2539 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,402 psi | 52% | 2720 fps | 95.2% |
| Alliant Reloder-26 | 101.9 gr | 84% | 31,662 psi | 50% | 2717 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,997 psi | 83% | 3028 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 44,846 psi | 70% | 2976 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 45,832 psi | 72% | 2894 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,815 psi | 67% | 2933 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 40,408 psi | 63% | 2753 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 46,267 psi | 73% | 2904 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 38,218 psi | 60% | 2782 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 43,961 psi | 69% | 2867 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 98% | 53,621 psi | 84% | 3064 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,475 psi | 82% | 3045 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 53,708 psi | 84% | 3022 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,967 psi | 52% | 2635 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,357 psi | 79% | 3002 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,943 psi | 63% | 2851 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,050 psi | 42% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,372 psi | 81% | 2969 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,529 psi | 74% | 2890 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,777 psi | 78% | 2920 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 41,060 psi | 64% | 2789 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,785 psi | 65% | 2785 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 34,867 psi | 55% | 2684 fps | 97.3% |
| IMR 4895 | <<locked>> | 80% | 49,893 psi | 78% | 2986 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,040 psi | 82% | 2999 fps | 95.6% |
| Lovex D073.6 | <<locked>> | 80% | 53,505 psi | 84% | 2986 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,199 psi | 82% | 2933 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,747 psi | 75% | 2890 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,305 psi | 62% | 2733 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 37,579 psi | 59% | 2710 fps | 95.5% |
| Lovex S071 | <<locked>> | 92% | 33,678 psi | 53% | 2651 fps | 95% |
| Norma 201 | <<locked>> | 80% | 51,909 psi | 81% | 2953 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,518 psi | 82% | 2949 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,008 psi | 75% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,453 psi | 68% | 2881 fps | 95% |
| Norma MRP | <<locked>> | 90% | 39,233 psi | 61% | 2884 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 36,042 psi | 56% | 2730 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 48,283 psi | 76% | 2959 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,674 psi | 75% | 3035 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 35,070 psi | 55% | 2713 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 42,482 psi | 67% | 2904 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,543 psi | 43% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,238 psi | 72% | 2881 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,634 psi | 82% | 3081 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,525 psi | 67% | 2936 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,868 psi | 56% | 2749 fps | 97.2% |
| ReloadSwiss RS 70 | 96.2 gr | 80% | 35,070 psi | 55% | 2753 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,117 psi | 61% | 2904 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 49,559 psi | 78% | 2907 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,062 psi | 67% | 2835 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,587 psi | 75% | 2927 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 44,454 psi | 70% | 2923 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 40,408 psi | 63% | 2753 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,305 psi | 62% | 2733 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,505 psi | 84% | 2986 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,747 psi | 75% | 2890 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,579 psi | 59% | 2710 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,280 psi | 69% | 2890 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,692 psi | 81% | 2982 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,765 psi | 83% | 2884 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,527 psi | 70% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,551 psi | 60% | 2674 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,077 psi | 69% | 2917 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 52,489 psi | 82% | 2881 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,911 psi | 84% | 3002 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,453 psi | 68% | 2835 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,214 psi | 82% | 2976 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 32,532 psi | 51% | 2680 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 39,552 psi | 62% | 2785 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 53,272 psi | 83% | 2867 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,661 psi | 78% | 2867 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,835 psi | 78% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,495 psi | 65% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,478 psi | 59% | 2730 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 41,524 psi | 65% | 2818 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,240 psi | 76% | 2874 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,028 psi | 58% | 2730 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 28,326 psi | 44% | 2559 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 98% | 52,185 psi | 82% | 3130 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,738 psi | 58% | 2697 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 38,348 psi | 60% | 2785 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,078 psi | 41% | 2566 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,590 psi | 81% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,701 psi | 70% | 2887 fps | 95.6% |
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 103 powders for .378 Weath. Mag. loaded with the .374 | 235gr | Rhino Penetrator. Alliant Reloder-26 delivers the highest muzzle velocity at 3,261 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,261 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 235.0 gr projectile in 0.374" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, ADI AR 2213 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, Alliant Reloder-26 rank at the top here: for .378 Weath. Mag. with the .374 | 235gr | Rhino Penetrator 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.