Load Specifications
Bullet Manufacturer:Barnes
Bullet Weight:255 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Weath. Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:105 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Load data in caliber .375 Weath. Mag. with .375 | 255gr | Barnes Original FN FB bullet and 104 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 56,521 psi | 89% | 2680 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,085 psi | 86% | 2710 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,897 psi | 86% | 2703 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,029 psi | 89% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,462 psi | 85% | 2700 fps | 96.4% |
| Accurate 4064 | <<locked>> | 92% | 54,810 psi | 86% | 2749 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,433 psi | 85% | 2825 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 88% | 55,637 psi | 87% | 2782 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 56,608 psi | 89% | 2779 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,781 psi | 86% | 2733 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,259 psi | 87% | 2710 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,594 psi | 89% | 2838 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,201 psi | 87% | 2894 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,565 psi | 89% | 2802 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,188 psi | 88% | 2684 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,203 psi | 90% | 2822 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,402 psi | 82% | 2825 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 57,319 psi | 90% | 2920 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,376 psi | 59% | 2562 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,539 psi | 65% | 2710 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,463 psi | 87% | 2795 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 57,203 psi | 90% | 2818 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,348 psi | 90% | 2782 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,492 psi | 89% | 2717 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,711 psi | 90% | 2815 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,912 psi | 88% | 2858 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 55,288 psi | 87% | 2726 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,521 psi | 89% | 2756 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,621 psi | 86% | 2776 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,435 psi | 90% | 2874 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 96% | 54,723 psi | 86% | 2782 fps | 96% |
| Hodgdon H4895 | <<locked>> | 88% | 56,202 psi | 88% | 2789 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,689 psi | 76% | 2710 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,390 psi | 87% | 2822 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,839 psi | 86% | 2858 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,259 psi | 55% | 1673 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,580 psi | 90% | 2792 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,970 psi | 88% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,086 psi | 88% | 2762 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,347 psi | 88% | 2743 fps | 97.5% |
| IMR 4198 | <<locked>> | 82% | 56,217 psi | 88% | 2644 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2753 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,709 psi | 87% | 2762 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 2762 fps | 99.1% |
| IMR 4895 | <<locked>> | 90% | 54,940 psi | 86% | 2799 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 54,781 psi | 86% | 2733 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,926 psi | 86% | 2720 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,216 psi | 87% | 2759 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,317 psi | 87% | 2710 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 55,840 psi | 88% | 2759 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,926 psi | 86% | 2756 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 2785 fps | 97.7% |
| Norma 201 | <<locked>> | 88% | 54,520 psi | 85% | 2730 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,955 psi | 86% | 2733 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,347 psi | 88% | 2808 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 53,403 psi | 84% | 2812 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 57,043 psi | 89% | 2838 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,388 psi | 82% | 2805 fps | 97.8% |
| Ramshot TAC | <<locked>> | 86% | 55,085 psi | 86% | 2753 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,592 psi | 86% | 2769 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,608 psi | 87% | 2736 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,766 psi | 56% | 1713 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,201 psi | 85% | 2713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,100 psi | 86% | 2759 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,940 psi | 85% | 2835 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,116 psi | 90% | 2920 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,954 psi | 85% | 2844 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 2871 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 86% | 55,564 psi | 87% | 2713 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,824 psi | 86% | 2723 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,840 psi | 89% | 2805 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,348 psi | 90% | 2782 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,926 psi | 86% | 2756 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,216 psi | 87% | 2759 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,840 psi | 88% | 2759 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 2785 fps | 97.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,406 psi | 90% | 2736 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,013 psi | 86% | 2815 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,246 psi | 90% | 2710 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 57,058 psi | 89% | 2779 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,667 psi | 90% | 2805 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,188 psi | 88% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,202 psi | 88% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,390 psi | 87% | 2710 fps | 97.3% |
| Somchem S321 | <<locked>> | 84% | 56,028 psi | 88% | 2769 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,492 psi | 87% | 2671 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,608 psi | 89% | 2772 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 57,174 psi | 90% | 2802 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,848 psi | 75% | 2762 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,854 psi | 88% | 2635 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,318 psi | 88% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,418 psi | 85% | 2694 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,434 psi | 87% | 2710 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,201 psi | 87% | 2733 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,275 psi | 88% | 2808 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 86% | 55,259 psi | 87% | 2733 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 57,058 psi | 89% | 2753 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 2815 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,509 psi | 63% | 2638 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,971 psi | 89% | 2795 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,071 psi | 86% | 2782 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 2877 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,373 psi | 52% | 2543 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,624 psi | 90% | 2812 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 47,123 psi | 74% | 2552 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,401 psi | 81% | 2657 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,755 psi | 62% | 2477 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,485 psi | 73% | 2618 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 51,097 psi | 80% | 2644 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 37,579 psi | 59% | 2467 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 35,911 psi | 56% | 2493 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 43,352 psi | 68% | 2575 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,927 psi | 58% | 2431 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,397 psi | 71% | 2585 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 45,411 psi | 71% | 2575 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,069 psi | 83% | 2785 fps | 99.9% |
| Alliant Power Pro 2000-MR | 73.7 gr | 80% | 39,247 psi | 62% | 2595 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,419 psi | 57% | 2451 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,968 psi | 83% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,131 psi | 61% | 2510 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,245 psi | 57% | 2503 fps | 95.6% |
| Alliant Reloder-17 | 72.6 gr | 80% | 31,372 psi | 49% | 2408 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,125 psi | 49% | 2402 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,682 psi | 61% | 2644 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,482 psi | 67% | 2579 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 35,868 psi | 56% | 2451 fps | 97.9% |
| Bofors RP7 | <<locked>> | 92% | 47,601 psi | 75% | 2628 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,108 psi | 74% | 2575 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,048 psi | 69% | 2605 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,515 psi | 76% | 2743 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 80% | 51,866 psi | 81% | 2677 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,750 psi | 83% | 2703 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,811 psi | 58% | 2454 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 94% | 47,123 psi | 74% | 2710 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 94% | 51,474 psi | 81% | 2733 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 43,743 psi | 69% | 2585 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 31,198 psi | 49% | 2352 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,624 psi | 62% | 2556 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 94% | 47,369 psi | 74% | 2730 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,281 psi | 41% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,032 psi | 66% | 2543 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 43,337 psi | 68% | 2585 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,769 psi | 61% | 2464 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 46,789 psi | 73% | 2589 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 52,939 psi | 83% | 2602 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 47,616 psi | 75% | 2651 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 46,499 psi | 73% | 2612 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 34,795 psi | 55% | 2451 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 40,059 psi | 63% | 2539 fps | 98.1% |
| IMR 8208 XBR | <<locked>> | 80% | 45,397 psi | 71% | 2585 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 51,256 psi | 80% | 2667 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,293 psi | 66% | 2556 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 43,511 psi | 68% | 2516 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 38,580 psi | 60% | 2467 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 40,625 psi | 64% | 2507 fps | 95.4% |
| Lovex S070 | <<locked>> | 92% | 43,526 psi | 68% | 2582 fps | 95% |
| Norma 201 | <<locked>> | 80% | 42,511 psi | 67% | 2533 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 42,772 psi | 67% | 2543 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,493 psi | 60% | 2500 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 36,332 psi | 57% | 2497 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,898 psi | 59% | 2510 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 43,076 psi | 68% | 2641 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 45,266 psi | 71% | 2589 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,672 psi | 70% | 2608 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,892 psi | 77% | 2631 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,672 psi | 42% | 1532 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,792 psi | 80% | 2664 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 42,511 psi | 67% | 2546 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,770 psi | 64% | 2605 fps | 97.7% |
| ReloadSwiss RS 60 | 72.6 gr | 80% | 33,402 psi | 52% | 2477 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,665 psi | 56% | 2507 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,566 psi | 60% | 2572 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 46,383 psi | 73% | 2575 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,422 psi | 63% | 2484 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 33,779 psi | 53% | 2395 fps | 97% |
| Rottweil R 907 | <<locked>> | 92% | 47,601 psi | 75% | 2628 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,625 psi | 64% | 2507 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,293 psi | 66% | 2556 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 38,580 psi | 60% | 2467 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 92% | 43,526 psi | 68% | 2582 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,722 psi | 84% | 2684 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,708 psi | 54% | 2441 fps | 96.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,679 psi | 84% | 2664 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,439 psi | 68% | 2559 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,742 psi | 65% | 2543 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,859 psi | 69% | 2487 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,405 psi | 57% | 2359 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 45,527 psi | 71% | 2556 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 49,081 psi | 77% | 2664 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 43,482 psi | 68% | 2490 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,308 psi | 68% | 2562 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 34,751 psi | 54% | 2405 fps | 97.1% |
| Somchem S365 | <<locked>> | 84% | 28,601 psi | 45% | 2339 fps | 96% |
| Vihtavuori N130 | <<locked>> | 80% | 49,530 psi | 78% | 2549 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,150 psi | 69% | 2484 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,726 psi | 62% | 2470 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,393 psi | 63% | 2477 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,924 psi | 52% | 2346 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 86% | 35,621 psi | 56% | 2444 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 45,382 psi | 71% | 2579 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 38,943 psi | 61% | 2467 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 37,420 psi | 59% | 2500 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 33,301 psi | 52% | 2477 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,270 psi | 49% | 2320 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 44,918 psi | 70% | 2625 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 44,266 psi | 69% | 2654 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,314 psi | 49% | 2480 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,147 psi | 64% | 2546 fps | 98.7% |
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 117 powders for .375 Weath. Mag. loaded with the .375 | 255gr | Barnes Original FN FB. Alliant Reloder-17 delivers the highest muzzle velocity at 2,920 fps; across all powders the maximum-charge window runs from 1,673 fps to 2,920 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. Accurate 3100, Accurate 4350, 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .375 Weath. Mag. with the .375 | 255gr | Barnes Original FN FB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.