Load Specifications
Load data in caliber .378 Weath. Mag. with .376 | 300gr | Peregrine VRG-3 bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Vihtavuori N560 and Norma MRP.
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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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 2700 | <<locked>> | 82% | 57,653 psi | 90% | 2720 fps | 99.9% |
| Accurate 3100 | <<locked>> | 98% | 56,840 psi | 89% | 2776 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,000 psi | 89% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,984 psi | 86% | 2759 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,535 psi | 87% | 2874 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 84% | 57,072 psi | 89% | 2723 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,144 psi | 88% | 2818 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 98% | 57,450 psi | 90% | 2877 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,599 psi | 70% | 2657 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,378 psi | 62% | 2621 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,563 psi | 86% | 2694 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,130 psi | 88% | 2815 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,450 psi | 90% | 2828 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,448 psi | 87% | 2805 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,913 psi | 89% | 2871 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,070 psi | 85% | 2785 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,835 psi | 78% | 2789 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,331 psi | 85% | 2874 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 55,941 psi | 88% | 2785 fps | 96.6% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,709 psi | 87% | 2851 fps | 99.7% |
| Bofors RP3 | <<locked>> | 82% | 55,274 psi | 87% | 2710 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,687 psi | 72% | 2726 fps | 98.1% |
| Bofors RP5 | <<locked>> | 98% | 56,913 psi | 89% | 2871 fps | 99.8% |
| Bofors RP7 | <<locked>> | 86% | 54,636 psi | 86% | 2710 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,255 psi | 77% | 2746 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 82% | 55,550 psi | 87% | 2733 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,159 psi | 90% | 2818 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 56,405 psi | 88% | 2776 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 96% | 57,551 psi | 90% | 2818 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,318 psi | 88% | 2802 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,376 psi | 88% | 2736 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,834 psi | 77% | 2851 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 86% | 53,621 psi | 84% | 2799 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 58% | 1690 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,521 psi | 89% | 2703 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,985 psi | 88% | 2749 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,246 psi | 88% | 2736 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 55,419 psi | 87% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,187 psi | 86% | 2749 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 98% | 54,969 psi | 86% | 2854 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 56,753 psi | 89% | 2694 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,449 psi | 88% | 2730 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,607 psi | 86% | 2726 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,546 psi | 79% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 82% | 57,551 psi | 90% | 2749 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,913 psi | 89% | 2805 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 34,824 psi | 55% | 2543 fps | 96.9% |
| Norma MRP | <<locked>> | 96% | 56,739 psi | 89% | 2894 fps | 100% |
| Norma URP | <<locked>> | 90% | 57,334 psi | 90% | 2795 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,535 psi | 87% | 2874 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 90% | 56,101 psi | 88% | 2802 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,461 psi | 84% | 2808 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,550 psi | 59% | 1729 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,463 psi | 87% | 2720 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,927 psi | 89% | 2815 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,114 psi | 86% | 2785 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,334 psi | 90% | 2867 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,052 psi | 77% | 2848 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 43,830 psi | 69% | 2726 fps | 96% |
| Rottweil R 903 | <<locked>> | 84% | 55,651 psi | 87% | 2710 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,537 psi | 90% | 2789 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 94% | 54,781 psi | 86% | 2792 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 86% | 54,636 psi | 86% | 2710 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,449 psi | 88% | 2730 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,753 psi | 89% | 2694 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,607 psi | 86% | 2726 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,276 psi | 90% | 2766 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,101 psi | 88% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,956 psi | 88% | 2687 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,331 psi | 85% | 2789 fps | 99.6% |
| Somchem S355 | <<locked>> | 84% | 55,492 psi | 87% | 2703 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,303 psi | 87% | 2726 fps | 98.4% |
| Somchem S365 | <<locked>> | 92% | 57,406 psi | 90% | 2792 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,245 psi | 87% | 2766 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 86% | 56,710 psi | 89% | 2677 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,709 psi | 87% | 2736 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,665 psi | 86% | 2746 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 82% | 57,348 psi | 90% | 2671 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,781 psi | 86% | 2743 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,347 psi | 88% | 2808 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,782 psi | 89% | 2890 fps | 99% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,214 psi | 82% | 2808 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,259 psi | 87% | 2700 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,319 psi | 90% | 2818 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,781 psi | 86% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,434 psi | 87% | 2766 fps | 99.6% |
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 2700 | <<locked>> | 80% | 53,896 psi | 84% | 2664 fps | 99.7% |
| Accurate 3100 | <<locked>> | 80% | 30,589 psi | 48% | 2303 fps | 96.7% |
| Accurate 4064 | <<locked>> | 80% | 53,548 psi | 84% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,655 psi | 65% | 2549 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 41,713 psi | 65% | 2635 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 50,444 psi | 79% | 2628 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,070 psi | 55% | 2428 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 86% | 38,174 psi | 60% | 2526 fps | 95% |
| ADI AR 2217 | <<locked>> | 96% | 38,986 psi | 61% | 2543 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 92% | 30,414 psi | 48% | 2385 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,242 psi | 80% | 2648 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,292 psi | 63% | 2559 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,412 psi | 73% | 2671 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,012 psi | 55% | 2428 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 84% | 35,273 psi | 55% | 2477 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,573 psi | 46% | 2336 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 27,615 psi | 43% | 2297 fps | 95.8% |
| Alliant Reloder-26 | 93.3 gr | 80% | 31,908 psi | 50% | 2457 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 49,385 psi | 77% | 2674 fps | 95% |
| Bofors RP15 | <<locked>> | 86% | 35,041 psi | 55% | 2470 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 51,851 psi | 81% | 2661 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 37,217 psi | 58% | 2556 fps | 95.7% |
| Bofors RP5 | <<locked>> | 84% | 35,273 psi | 55% | 2477 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 45,121 psi | 71% | 2556 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 92% | 37,391 psi | 59% | 2510 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 51,996 psi | 81% | 2680 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,700 psi | 68% | 2598 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 46,557 psi | 73% | 2615 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 40,814 psi | 64% | 2536 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 40,045 psi | 63% | 2520 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,942 psi | 59% | 2451 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 32,779 psi | 51% | 2484 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 42,728 psi | 67% | 2618 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 43% | 1509 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,069 psi | 83% | 2657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,712 psi | 64% | 2493 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,702 psi | 73% | 2585 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 39,827 psi | 62% | 2500 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 40,190 psi | 63% | 2487 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 39,131 psi | 61% | 2562 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 53,330 psi | 84% | 2648 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,005 psi | 69% | 2533 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 42,322 psi | 66% | 2523 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 28,007 psi | 44% | 2234 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 53,940 psi | 85% | 2700 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,379 psi | 63% | 2523 fps | 97% |
| Norma 217 | <<locked>> | 98% | 32,518 psi | 51% | 2480 fps | 95.9% |
| Norma MRP | 90.6 gr | 80% | 32,068 psi | 50% | 2425 fps | 96% |
| Norma URP | <<locked>> | 80% | 41,321 psi | 65% | 2543 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 38,653 psi | 61% | 2566 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 40,074 psi | 63% | 2536 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 31,865 psi | 50% | 2388 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 44% | 1545 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,866 psi | 81% | 2671 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,356 psi | 77% | 2713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,669 psi | 65% | 2572 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,132 psi | 63% | 2589 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 31,865 psi | 50% | 2461 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 40,756 psi | 64% | 2661 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 48,820 psi | 77% | 2612 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 38,972 psi | 61% | 2467 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 34,214 psi | 54% | 2411 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 45,121 psi | 71% | 2556 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,005 psi | 69% | 2533 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 53,330 psi | 84% | 2648 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,322 psi | 66% | 2523 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,154 psi | 79% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,588 psi | 78% | 2500 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,062 psi | 67% | 2484 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,910 psi | 53% | 2405 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,805 psi | 76% | 2608 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 42,380 psi | 66% | 2513 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 37,942 psi | 59% | 2497 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,751 psi | 54% | 2395 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 80% | 46,760 psi | 73% | 2539 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,714 psi | 67% | 2536 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 32,039 psi | 50% | 2326 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 53,838 psi | 84% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,061 psi | 66% | 2539 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,069 psi | 52% | 2405 fps | 99.3% |
| Vihtavuori N560 | 97.4 gr | 86% | 40,089 psi | 63% | 2595 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 92% | 39,465 psi | 62% | 2575 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,698 psi | 65% | 2503 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,830 psi | 69% | 2602 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,034 psi | 41% | 2336 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 33,852 psi | 53% | 2375 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 86 powders for .378 Weath. Mag. loaded with the .376 | 300gr | Peregrine VRG-3. Winchester StaBALL HD delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,917 fps. ADI AR 2217 gives the best case fill at 100 %, and 86 of the 86 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.376" calls for a 1:6.0 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. Alliant Reloder-26, Vihtavuori N560, Norma MRP rank at the top here: for .378 Weath. Mag. with the .376 | 300gr | Peregrine VRG-3 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.