Load Specifications
Bullet:.375 | 270gr | Barnes X S
Bullet Manufacturer:Barnes
Bullet Weight:270 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
Recommended Twist Rate:1:6.0
Load data in caliber .375 Weath. Mag. with .375 | 270gr | Barnes X S bullet and 103 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>> | 84% | 54,636 psi | 86% | 2526 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,608 psi | 89% | 2598 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,363 psi | 90% | 2602 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,563 psi | 86% | 2608 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,332 psi | 87% | 2582 fps | 96.4% |
| Accurate 4064 | <<locked>> | 92% | 56,826 psi | 89% | 2641 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,332 psi | 87% | 2710 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 88% | 56,565 psi | 89% | 2664 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 57,000 psi | 89% | 2654 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,492 psi | 87% | 2615 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,188 psi | 88% | 2595 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 57,392 psi | 90% | 2713 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,405 psi | 87% | 2766 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 57,232 psi | 90% | 2680 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,363 psi | 90% | 2569 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,491 psi | 85% | 2651 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 2700 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 57,450 psi | 90% | 2792 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,595 psi | 60% | 2470 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,482 psi | 67% | 2605 fps | 96.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,811 psi | 87% | 2674 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 54,679 psi | 86% | 2654 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,810 psi | 86% | 2615 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 57,334 psi | 90% | 2598 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,810 psi | 86% | 2648 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,362 psi | 88% | 2736 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 56,072 psi | 88% | 2608 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 57,203 psi | 90% | 2635 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,535 psi | 87% | 2661 fps | 99.1% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 2746 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 96% | 55,245 psi | 87% | 2661 fps | 96% |
| Hodgdon H4895 | <<locked>> | 88% | 57,072 psi | 89% | 2671 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,211 psi | 77% | 2592 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,912 psi | 88% | 2700 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,969 psi | 86% | 2730 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,810 psi | 56% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,505 psi | 85% | 2621 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 56,724 psi | 89% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,782 psi | 89% | 2641 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,826 psi | 89% | 2618 fps | 97.5% |
| IMR 4198 | <<locked>> | 82% | 56,768 psi | 89% | 2523 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2635 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,115 psi | 88% | 2641 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,170 psi | 82% | 2648 fps | 99.1% |
| IMR 4895 | <<locked>> | 90% | 55,724 psi | 87% | 2680 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 55,492 psi | 87% | 2615 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,231 psi | 88% | 2605 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,550 psi | 89% | 2644 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,086 psi | 88% | 2592 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 56,797 psi | 89% | 2641 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,738 psi | 87% | 2638 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 2671 fps | 97.7% |
| Norma 201 | <<locked>> | 88% | 55,840 psi | 88% | 2615 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,796 psi | 87% | 2612 fps | 100% |
| Norma 203B | <<locked>> | 92% | 57,029 psi | 89% | 2690 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 53,853 psi | 84% | 2690 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 57,203 psi | 90% | 2710 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,823 psi | 83% | 2687 fps | 97.8% |
| Ramshot TAC | <<locked>> | 86% | 55,695 psi | 87% | 2631 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,085 psi | 86% | 2648 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,492 psi | 89% | 2618 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 57% | 1624 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,013 psi | 86% | 2595 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,622 psi | 87% | 2638 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,462 psi | 85% | 2713 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,174 psi | 90% | 2792 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,418 psi | 85% | 2726 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2746 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 86% | 57,276 psi | 90% | 2598 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,246 psi | 88% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,578 psi | 86% | 2644 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,810 psi | 86% | 2615 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,738 psi | 87% | 2638 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,550 psi | 89% | 2644 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,797 psi | 89% | 2641 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 2671 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,492 psi | 87% | 2694 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,740 psi | 90% | 2585 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,360 psi | 85% | 2612 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,708 psi | 86% | 2635 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,000 psi | 89% | 2552 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,768 psi | 89% | 2549 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,304 psi | 88% | 2595 fps | 97.4% |
| Somchem S321 | <<locked>> | 84% | 56,768 psi | 89% | 2648 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,492 psi | 89% | 2556 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 57,072 psi | 89% | 2651 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 54,882 psi | 86% | 2641 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,602 psi | 76% | 2651 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 56,710 psi | 89% | 2516 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,927 psi | 89% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,521 psi | 87% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,188 psi | 88% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,912 psi | 88% | 2618 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 2687 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 86% | 55,956 psi | 88% | 2615 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 57,725 psi | 90% | 2635 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 2694 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,771 psi | 65% | 2546 fps | 98% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 57,072 psi | 89% | 2671 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,463 psi | 87% | 2657 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,302 psi | 85% | 2700 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,824 psi | 55% | 2464 fps | 97.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,462 psi | 85% | 2641 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% | 48,602 psi | 76% | 2444 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,084 psi | 83% | 2552 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,511 psi | 67% | 2395 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,095 psi | 75% | 2516 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 48,849 psi | 77% | 2484 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,161 psi | 63% | 2388 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,418 psi | 56% | 2365 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 44,628 psi | 70% | 2474 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 38,029 psi | 60% | 2333 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,499 psi | 73% | 2480 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 46,572 psi | 73% | 2467 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 54,041 psi | 85% | 2664 fps | 100% |
| Alliant Power Pro 2000-MR | 67 gr | 80% | 40,350 psi | 63% | 2497 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,840 psi | 59% | 2362 fps | 98.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,114 psi | 85% | 2526 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,524 psi | 64% | 2415 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,346 psi | 55% | 2362 fps | 95.2% |
| Alliant Reloder-17 | 66 gr | 80% | 32,866 psi | 52% | 2329 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,908 psi | 48% | 2280 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 98% | 39,856 psi | 62% | 2549 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,497 psi | 68% | 2474 fps | 97.8% |
| Bofors RP3 | <<locked>> | 80% | 37,855 psi | 59% | 2372 fps | 98.4% |
| Bofors RP7 | <<locked>> | 92% | 48,776 psi | 76% | 2520 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,196 psi | 76% | 2467 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,368 psi | 71% | 2503 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,182 psi | 77% | 2628 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 52,649 psi | 83% | 2562 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 53,664 psi | 84% | 2589 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,392 psi | 60% | 2365 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 92% | 45,020 psi | 71% | 2546 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 94% | 51,953 psi | 81% | 2612 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 45,063 psi | 71% | 2484 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,966 psi | 49% | 2228 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,756 psi | 64% | 2457 fps | 99% |
| Hodgdon Superformance | <<locked>> | 94% | 48,008 psi | 75% | 2615 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 42% | 1417 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,047 psi | 67% | 2438 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 44,570 psi | 70% | 2484 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,929 psi | 63% | 2365 fps | 97.6% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,962 psi | 70% | 2428 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 53,708 psi | 84% | 2484 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 48,124 psi | 75% | 2536 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 47,311 psi | 74% | 2500 fps | 95.5% |
| IMR 4831 | <<locked>> | 86% | 34,127 psi | 53% | 2320 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 41,495 psi | 65% | 2448 fps | 98.4% |
| IMR 8208 XBR | <<locked>> | 80% | 46,499 psi | 73% | 2480 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 52,968 psi | 83% | 2562 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,961 psi | 69% | 2461 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,643 psi | 70% | 2411 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 40,306 psi | 63% | 2379 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 39,653 psi | 62% | 2365 fps | 95% |
| Lovex S070 | <<locked>> | 92% | 44,831 psi | 70% | 2484 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 44,222 psi | 69% | 2434 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 44,019 psi | 69% | 2441 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,016 psi | 63% | 2408 fps | 98% |
| Norma URP | <<locked>> | 86% | 35,520 psi | 56% | 2359 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 39,117 psi | 61% | 2415 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 41,539 psi | 65% | 2487 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 46,267 psi | 73% | 2480 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,759 psi | 72% | 2503 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,908 psi | 78% | 2520 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,224 psi | 43% | 1450 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,750 psi | 81% | 2552 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,714 psi | 69% | 2444 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,945 psi | 66% | 2507 fps | 98% |
| ReloadSwiss RS 60 | 66 gr | 80% | 34,824 psi | 55% | 2392 fps | 99.1% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,130 psi | 58% | 2421 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,595 psi | 62% | 2474 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 48,501 psi | 76% | 2474 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,250 psi | 66% | 2392 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 35,795 psi | 56% | 2323 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 48,776 psi | 76% | 2520 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,653 psi | 62% | 2365 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,961 psi | 69% | 2461 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,306 psi | 63% | 2379 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 44,831 psi | 70% | 2484 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,042 psi | 56% | 2356 fps | 96.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 54,650 psi | 86% | 2546 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,947 psi | 70% | 2464 fps | 97.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,931 psi | 67% | 2444 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,252 psi | 71% | 2388 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,797 psi | 59% | 2270 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 46,760 psi | 73% | 2454 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 50,169 psi | 79% | 2556 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,947 psi | 70% | 2392 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,309 psi | 69% | 2457 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 36,492 psi | 57% | 2323 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 26,992 psi | 42% | 2175 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 50,807 psi | 80% | 2441 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,382 psi | 71% | 2382 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,452 psi | 65% | 2375 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,756 psi | 65% | 2382 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,635 psi | 54% | 2267 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 86% | 36,941 psi | 58% | 2356 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 46,644 psi | 73% | 2477 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 40,219 psi | 63% | 2372 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,434 psi | 57% | 2362 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 92% | 32,996 psi | 52% | 2356 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,835 psi | 48% | 2195 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 45,919 psi | 72% | 2516 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 45,194 psi | 71% | 2549 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,009 psi | 49% | 2349 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,409 psi | 66% | 2448 fps | 98.9% |
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 118 powders for .375 Weath. Mag. loaded with the .375 | 270gr | Barnes X S. Alliant Reloder-17 delivers the highest muzzle velocity at 2,792 fps; across all powders the maximum-charge window runs from 1,588 fps to 2,792 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 270.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. 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 | 270gr | Barnes X S 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.