Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:276 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:1:15.5
Load data in caliber .378 Weath. Mag. with .376 | 276gr | Peregrine VLR-5 bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country 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.
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>> | 82% | 55,376 psi | 87% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,087 psi | 89% | 2805 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 2851 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 55,956 psi | 88% | 2776 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 57,159 psi | 90% | 2897 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 56,463 psi | 88% | 3005 fps | 98.7% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,551 psi | 90% | 3005 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 86% | 56,275 psi | 88% | 2815 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,592 psi | 86% | 2894 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,825 psi | 87% | 2946 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 35,592 psi | 56% | 2605 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,825 psi | 87% | 2940 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,636 psi | 86% | 2890 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,636 psi | 86% | 2890 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,101 psi | 89% | 2838 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,348 psi | 90% | 2861 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,389 psi | 85% | 2900 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,680 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,609 psi | 90% | 2936 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 2943 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,837 psi | 81% | 2864 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,875 psi | 70% | 2802 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,811 psi | 87% | 3012 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,111 psi | 79% | 2864 fps | 98.4% |
| Bofors RP3 | <<locked>> | 84% | 54,331 psi | 85% | 2802 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 2943 fps | 99.2% |
| Bofors RP7 | <<locked>> | 90% | 57,276 psi | 90% | 2848 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 44,556 psi | 70% | 2740 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 84% | 54,650 psi | 86% | 2822 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,796 psi | 87% | 2900 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 55,550 psi | 87% | 2861 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 56,115 psi | 88% | 2894 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,853 psi | 86% | 2871 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,766 psi | 86% | 2822 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,072 psi | 88% | 2854 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,990 psi | 69% | 2844 fps | 98% |
| Hodgdon Superformance | <<locked>> | 90% | 56,014 psi | 88% | 2940 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 57% | 1745 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,768 psi | 89% | 2818 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,811 psi | 87% | 2799 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,766 psi | 86% | 2785 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 54,984 psi | 86% | 2831 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,521 psi | 87% | 2822 fps | 99.7% |
| IMR 4831 | <<locked>> | 94% | 57,624 psi | 90% | 2887 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,288 psi | 87% | 2835 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,566 psi | 90% | 2877 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,185 psi | 83% | 2920 fps | 97.9% |
| Lovex S060 | <<locked>> | 82% | 57,217 psi | 90% | 2779 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,898 psi | 88% | 2789 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,521 psi | 87% | 2818 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 56,826 psi | 89% | 2861 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,411 psi | 71% | 2703 fps | 99.3% |
| Norma 201 | <<locked>> | 82% | 57,101 psi | 89% | 2795 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,637 psi | 89% | 2848 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,767 psi | 87% | 2887 fps | 98.9% |
| Norma MRP | <<locked>> | 98% | 54,491 psi | 85% | 2969 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 55,782 psi | 87% | 2881 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,653 psi | 90% | 2874 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,737 psi | 84% | 2940 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 92% | 54,694 psi | 86% | 2887 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,805 psi | 75% | 2812 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 58% | 1788 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,708 psi | 86% | 2812 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,201 psi | 87% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,232 psi | 90% | 2923 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,753 psi | 87% | 2956 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,874 psi | 69% | 2838 fps | 98.9% |
| Rottweil R 902 | <<locked>> | 82% | 54,244 psi | 85% | 2749 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,375 psi | 85% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,260 psi | 88% | 2864 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 98% | 56,855 psi | 89% | 2923 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 90% | 57,276 psi | 90% | 2848 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,521 psi | 87% | 2818 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,898 psi | 88% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,826 psi | 89% | 2861 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,202 psi | 88% | 2861 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,058 psi | 89% | 2831 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,579 psi | 87% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,201 psi | 87% | 2772 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,362 psi | 88% | 2920 fps | 99.3% |
| Somchem S335 | <<locked>> | 82% | 57,595 psi | 90% | 2720 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 54,360 psi | 85% | 2795 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,259 psi | 85% | 2802 fps | 97.3% |
| Somchem S365 | <<locked>> | 94% | 55,376 psi | 87% | 2881 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 57,363 psi | 90% | 2894 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 54,752 psi | 86% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,998 psi | 86% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,738 psi | 87% | 2769 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,447 psi | 85% | 2825 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,084 psi | 83% | 2818 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 84% | 56,666 psi | 89% | 2769 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,985 psi | 89% | 2881 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,143 psi | 85% | 2890 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,766 psi | 86% | 2959 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 46,514 psi | 73% | 2808 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,911 psi | 84% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,956 psi | 88% | 2900 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,978 psi | 74% | 2933 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,334 psi | 90% | 2838 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,751 psi | 84% | 2835 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 2495 | <<locked>> | 80% | 51,837 psi | 81% | 2671 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,850 psi | 78% | 2694 fps | 98.7% |
| Accurate 3100 | <<locked>> | 84% | 31,459 psi | 49% | 2411 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 49,168 psi | 77% | 2680 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,492 psi | 59% | 2562 fps | 99.1% |
| Accurate High Country | 99.7 gr | 90% | 42,424 psi | 66% | 2756 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 94% | 46,253 psi | 72% | 2815 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 46,789 psi | 73% | 2667 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 39,146 psi | 61% | 2608 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 92% | 42,540 psi | 67% | 2707 fps | 95% |
| ADI AR 2225 | <<locked>> | 98% | 33,301 psi | 52% | 2539 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,040 psi | 82% | 2884 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,262 psi | 62% | 2608 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,262 psi | 62% | 2608 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,282 psi | 74% | 2690 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,357 psi | 79% | 2756 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,753 psi | 58% | 2579 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,843 psi | 66% | 2700 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 38,856 psi | 61% | 2602 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,030 psi | 61% | 2651 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,731 psi | 42% | 2339 fps | 97.4% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,385 psi | 48% | 2457 fps | 95.8% |
| Alliant Reloder-26 | 91.3 gr | 80% | 28,456 psi | 45% | 2444 fps | 95.8% |
| Bofors RP15 | <<locked>> | 92% | 38,508 psi | 60% | 2638 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 47,471 psi | 74% | 2700 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,030 psi | 61% | 2651 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 41,742 psi | 65% | 2582 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 98% | 41,655 psi | 65% | 2680 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 47,863 psi | 75% | 2717 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 39,798 psi | 62% | 2618 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 80% | 42,772 psi | 67% | 2638 fps | 97% |
| Hodgdon H4831 | <<locked>> | 92% | 45,643 psi | 72% | 2717 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 44,657 psi | 70% | 2697 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,316 psi | 54% | 2470 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,417 psi | 82% | 2802 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 36,114 psi | 57% | 2651 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 38,696 psi | 61% | 2628 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 43% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,287 psi | 84% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,226 psi | 77% | 2700 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,474 psi | 81% | 2733 fps | 99.4% |
| IMR 4350 | <<locked>> | 80% | 37,434 psi | 59% | 2513 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,207 psi | 68% | 2612 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 36,187 psi | 57% | 2520 fps | 98.9% |
| IMR 4895 | <<locked>> | 80% | 51,663 psi | 81% | 2782 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 44,599 psi | 70% | 2657 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 94% | 43,395 psi | 68% | 2740 fps | 95.5% |
| Lovex S060 | <<locked>> | 80% | 53,751 psi | 84% | 2730 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,240 psi | 77% | 2690 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,611 psi | 64% | 2562 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 38,783 psi | 61% | 2543 fps | 97.4% |
| Lovex S071 | <<locked>> | 88% | 30,647 psi | 48% | 2392 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 53,577 psi | 84% | 2746 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,705 psi | 78% | 2743 fps | 100% |
| Norma 204 | <<locked>> | 82% | 39,479 psi | 62% | 2595 fps | 95.5% |
| Norma MRP | 93.1 gr | 84% | 33,228 psi | 52% | 2543 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 37,492 psi | 59% | 2562 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 50,299 psi | 79% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 43,178 psi | 68% | 2746 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 36,361 psi | 57% | 2549 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 35,534 psi | 56% | 2559 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,673 psi | 43% | 1598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,979 psi | 75% | 2703 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,498 psi | 70% | 2749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,463 psi | 59% | 2585 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,419 psi | 57% | 2595 fps | 98.5% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 35,317 psi | 55% | 2631 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 51,024 psi | 80% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,599 psi | 70% | 2648 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 43,410 psi | 68% | 2644 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 86% | 37,855 psi | 59% | 2582 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 41,742 psi | 65% | 2582 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,611 psi | 64% | 2562 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 49,240 psi | 77% | 2690 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,783 psi | 61% | 2543 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,963 psi | 72% | 2703 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,461 psi | 84% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,992 psi | 72% | 2549 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,668 psi | 62% | 2507 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 37,507 psi | 59% | 2579 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 54,143 psi | 85% | 2674 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,962 psi | 70% | 2648 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 47,456 psi | 74% | 2690 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 33,968 psi | 53% | 2520 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 36,013 psi | 56% | 2513 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 51,387 psi | 81% | 2661 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,605 psi | 81% | 2677 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,931 psi | 67% | 2575 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,899 psi | 61% | 2559 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 35,389 psi | 55% | 2490 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 49,879 psi | 78% | 2674 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,363 psi | 60% | 2562 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 29,501 psi | 46% | 2408 fps | 97.4% |
| Vihtavuori N560 | <<locked>> | 92% | 44,411 psi | 70% | 2776 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 98% | 43,337 psi | 68% | 2746 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,058 psi | 60% | 2530 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,914 psi | 63% | 2618 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,438 psi | 37% | 2306 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,664 psi | 84% | 2789 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 37,826 psi | 59% | 2552 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 100 powders for .378 Weath. Mag. loaded with the .376 | 276gr | Peregrine VLR-5. Alliant Reloder-26 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,745 fps to 3,012 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 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 276.0 gr projectile in 0.376" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for .378 Weath. Mag. with the .376 | 276gr | Peregrine VLR-5 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.