Load Specifications
Bullet Manufacturer:Woodleigh
Bullet Weight:300 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 H&H Mag. load data
Case Length (l3):2.859"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:95.3 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:6.0
Load data in caliber .375 H&H Mag. with .375 | 300gr | Woodleigh PP SN 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, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 55,767 psi | 89% | 2392 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,172 psi | 87% | 2418 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,940 psi | 86% | 2415 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,115 psi | 90% | 2477 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,708 psi | 86% | 2418 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 53,940 psi | 86% | 2457 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,142 psi | 85% | 2530 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 54,824 psi | 88% | 2487 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,709 psi | 89% | 2484 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,925 psi | 86% | 2441 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,375 psi | 87% | 2415 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,883 psi | 90% | 2536 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,143 psi | 87% | 2592 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,463 psi | 89% | 2503 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,492 psi | 89% | 2392 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,043 psi | 90% | 2523 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,358 psi | 82% | 2530 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,912 psi | 90% | 2615 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,506 psi | 59% | 2300 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,350 psi | 65% | 2431 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,317 psi | 87% | 2500 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 56,043 psi | 90% | 2520 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,217 psi | 90% | 2490 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,738 psi | 89% | 2425 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,011 psi | 85% | 2470 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,795 psi | 88% | 2556 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 54,607 psi | 88% | 2434 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,550 psi | 89% | 2457 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,505 psi | 86% | 2484 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,202 psi | 90% | 2575 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 96% | 53,824 psi | 86% | 2493 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 55,361 psi | 89% | 2493 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,500 psi | 76% | 2421 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,288 psi | 87% | 2523 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,272 psi | 85% | 2556 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,360 psi | 57% | 1476 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,287 psi | 85% | 2454 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,114 psi | 88% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,114 psi | 88% | 2467 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,448 psi | 89% | 2454 fps | 98% |
| IMR 4198 | <<locked>> | 82% | 55,637 psi | 89% | 2352 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,678 psi | 84% | 2464 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,766 psi | 88% | 2474 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,314 psi | 81% | 2477 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 54,172 psi | 87% | 2507 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 53,925 psi | 86% | 2441 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,085 psi | 87% | 2431 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,346 psi | 87% | 2464 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,549 psi | 87% | 2421 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 54,940 psi | 88% | 2464 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,925 psi | 86% | 2467 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,563 psi | 87% | 2497 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 53,635 psi | 86% | 2438 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,998 psi | 87% | 2438 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,201 psi | 89% | 2510 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,388 psi | 86% | 2510 fps | 95.8% |
| Norma URPᴾ | <<locked>> | 100% | 52,141 psi | 84% | 2516 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 55,796 psi | 89% | 2536 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,256 psi | 82% | 2516 fps | 98.2% |
| Ramshot TAC | <<locked>> | 86% | 54,230 psi | 87% | 2461 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,679 psi | 86% | 2477 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,839 psi | 88% | 2444 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,839 psi | 57% | 1512 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,388 psi | 86% | 2421 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,070 psi | 87% | 2470 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,866 psi | 85% | 2536 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,912 psi | 90% | 2615 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,562 psi | 84% | 2549 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 2572 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 86% | 54,665 psi | 88% | 2418 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,070 psi | 87% | 2434 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,651 psi | 89% | 2507 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,217 psi | 90% | 2490 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,925 psi | 86% | 2467 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,346 psi | 87% | 2464 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,940 psi | 88% | 2464 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,563 psi | 87% | 2497 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,969 psi | 87% | 2520 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,999 psi | 90% | 2487 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,142 psi | 85% | 2461 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,506 psi | 89% | 2382 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,114 psi | 88% | 2379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,288 psi | 87% | 2425 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 55,172 psi | 88% | 2474 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,636 psi | 88% | 2382 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,521 psi | 89% | 2480 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 56,188 psi | 90% | 2507 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,630 psi | 75% | 2474 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,317 psi | 89% | 2349 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,637 psi | 89% | 2369 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,679 psi | 86% | 2405 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,389 psi | 87% | 2418 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,099 psi | 87% | 2444 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,056 psi | 88% | 2516 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 54,433 psi | 87% | 2441 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,956 psi | 90% | 2461 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,998 psi | 87% | 2523 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,407 psi | 63% | 2365 fps | 98.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,637 psi | 89% | 2500 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,099 psi | 87% | 2484 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,692 psi | 84% | 2526 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,648 psi | 52% | 2293 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,823 psi | 85% | 2467 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% | 46,499 psi | 75% | 2274 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,618 psi | 81% | 2372 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,117 psi | 63% | 2211 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,818 psi | 73% | 2343 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,166 psi | 76% | 2323 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 37,014 psi | 59% | 2208 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,779 psi | 53% | 2188 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 42,786 psi | 69% | 2306 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,332 psi | 58% | 2172 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,802 psi | 72% | 2310 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 44,875 psi | 72% | 2300 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,344 psi | 84% | 2487 fps | 100% |
| Alliant Power Pro 2000-MR | 62.9 gr | 80% | 38,595 psi | 62% | 2326 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,839 psi | 57% | 2195 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,199 psi | 84% | 2352 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,580 psi | 62% | 2247 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,663 psi | 54% | 2201 fps | 95.7% |
| Alliant Reloder-17 | 62 gr | 80% | 30,893 psi | 50% | 2165 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,819 psi | 46% | 2116 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,172 psi | 56% | 2320 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,785 psi | 67% | 2310 fps | 98.1% |
| Bofors RP3 | <<locked>> | 80% | 35,302 psi | 57% | 2198 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 43,947 psi | 70% | 2306 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,673 psi | 75% | 2300 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,265 psi | 69% | 2329 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,630 psi | 76% | 2454 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,155 psi | 82% | 2388 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,938 psi | 83% | 2415 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,318 psi | 58% | 2201 fps | 96% |
| Hodgdon H414 | <<locked>> | 92% | 43,236 psi | 69% | 2379 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 92% | 47,427 psi | 76% | 2398 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 43,134 psi | 69% | 2313 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,877 psi | 46% | 2067 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,899 psi | 62% | 2287 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 94% | 46,427 psi | 74% | 2451 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 42% | 1316 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,408 psi | 66% | 2274 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 42,627 psi | 68% | 2306 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,130 psi | 61% | 2201 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,221 psi | 69% | 2264 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 52,576 psi | 84% | 2316 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 43,816 psi | 70% | 2329 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,062 psi | 69% | 2293 fps | 95.3% |
| IMR 4831 | <<locked>> | 86% | 31,981 psi | 51% | 2152 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 39,465 psi | 63% | 2274 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 44,802 psi | 72% | 2310 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 50,517 psi | 81% | 2385 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,655 psi | 67% | 2287 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,076 psi | 69% | 2251 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 38,101 psi | 61% | 2208 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 37,492 psi | 60% | 2201 fps | 95.4% |
| Lovex S070 | <<locked>> | 92% | 42,714 psi | 68% | 2313 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 41,916 psi | 67% | 2264 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 42,090 psi | 67% | 2270 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,942 psi | 61% | 2238 fps | 98.3% |
| Norma 204 | <<locked>> | 98% | 49,806 psi | 80% | 2457 fps | 95% |
| Norma URP | <<locked>> | 86% | 33,417 psi | 54% | 2192 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,202 psi | 60% | 2247 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 39,697 psi | 64% | 2323 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 44,599 psi | 72% | 2316 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,947 psi | 70% | 2333 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,356 psi | 78% | 2356 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 43% | 1348 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,111 psi | 80% | 2379 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,204 psi | 63% | 2231 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,132 psi | 64% | 2336 fps | 98.3% |
| ReloadSwiss RS 60 | 62 gr | 80% | 32,895 psi | 53% | 2224 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,983 psi | 56% | 2254 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,782 psi | 61% | 2310 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 45,832 psi | 73% | 2297 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,972 psi | 64% | 2221 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 33,214 psi | 53% | 2146 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 43,947 psi | 70% | 2306 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,492 psi | 60% | 2201 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,655 psi | 67% | 2287 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,101 psi | 61% | 2208 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 92% | 42,714 psi | 68% | 2313 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,171 psi | 55% | 2192 fps | 97.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,830 psi | 69% | 2293 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,205 psi | 66% | 2277 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,439 psi | 70% | 2221 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,027 psi | 58% | 2110 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,858 psi | 67% | 2244 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 48,283 psi | 77% | 2382 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,960 psi | 69% | 2224 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,569 psi | 68% | 2293 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 34,214 psi | 55% | 2156 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 24,816 psi | 40% | 2008 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 49,095 psi | 79% | 2274 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,714 psi | 70% | 2218 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,320 psi | 63% | 2208 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,813 psi | 64% | 2215 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,401 psi | 52% | 2100 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 32,779 psi | 53% | 2146 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,759 psi | 72% | 2306 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,377 psi | 62% | 2208 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,330 psi | 55% | 2195 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 30,560 psi | 49% | 2178 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,892 psi | 46% | 2034 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 44,121 psi | 71% | 2346 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 43,424 psi | 70% | 2382 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,747 psi | 46% | 2178 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,553 psi | 65% | 2283 fps | 99.2% |
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 103 powders for .375 H&H Mag. loaded with the .375 | 300gr | Woodleigh PP SN. Alliant Reloder-17 delivers the highest muzzle velocity at 2,615 fps; across all powders the maximum-charge window runs from 1,476 fps to 2,615 fps. Accurate 4350 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 (430 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .375 H&H Mag. with the .375 | 300gr | Woodleigh PP SN 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.