Load Specifications
Bullet:.375 | 300gr | Swift A-Frame
Bullet Manufacturer:Swift
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 | Swift A-Frame 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% | 55,767 psi | 89% | 2388 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,230 psi | 87% | 2418 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,940 psi | 86% | 2415 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,927 psi | 90% | 2474 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,548 psi | 86% | 2415 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 53,737 psi | 86% | 2454 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,953 psi | 85% | 2526 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 54,882 psi | 88% | 2487 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,767 psi | 89% | 2484 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,940 psi | 86% | 2441 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,433 psi | 87% | 2418 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,695 psi | 89% | 2533 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,128 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% | 56,072 psi | 90% | 2523 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,416 psi | 82% | 2533 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,912 psi | 90% | 2615 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,492 psi | 59% | 2300 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,379 psi | 65% | 2434 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,375 psi | 87% | 2500 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 55,811 psi | 89% | 2516 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,202 psi | 90% | 2490 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,767 psi | 89% | 2425 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,852 psi | 85% | 2470 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,824 psi | 88% | 2556 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 54,650 psi | 88% | 2434 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,608 psi | 89% | 2461 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,563 psi | 86% | 2484 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,275 psi | 90% | 2575 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 96% | 53,664 psi | 86% | 2493 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 55,390 psi | 89% | 2493 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,485 psi | 76% | 2425 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,273 psi | 87% | 2523 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,345 psi | 86% | 2559 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,389 psi | 57% | 1476 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,272 psi | 85% | 2454 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,172 psi | 88% | 2477 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,172 psi | 88% | 2467 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,506 psi | 89% | 2454 fps | 98% |
| IMR 4198 | <<locked>> | 82% | 55,680 psi | 89% | 2352 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,736 psi | 85% | 2467 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,752 psi | 88% | 2470 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,125 psi | 80% | 2474 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 53,969 psi | 87% | 2503 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 53,940 psi | 86% | 2441 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,896 psi | 86% | 2428 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,157 psi | 87% | 2464 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,607 psi | 88% | 2421 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 54,998 psi | 88% | 2464 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,998 psi | 87% | 2467 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2497 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 53,693 psi | 86% | 2438 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,012 psi | 87% | 2438 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,230 psi | 89% | 2510 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,200 psi | 85% | 2507 fps | 95.8% |
| Norma URPᴾ | <<locked>> | 100% | 52,199 psi | 84% | 2516 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 55,637 psi | 89% | 2536 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,039 psi | 82% | 2513 fps | 98.2% |
| Ramshot TAC | <<locked>> | 86% | 54,230 psi | 87% | 2464 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,490 psi | 86% | 2474 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,868 psi | 88% | 2444 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 57% | 1512 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,447 psi | 86% | 2425 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,838 psi | 86% | 2467 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,895 psi | 85% | 2536 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,666 psi | 89% | 2612 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,547 psi | 84% | 2549 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,634 psi | 84% | 2572 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 86% | 54,694 psi | 88% | 2418 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,128 psi | 87% | 2434 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,680 psi | 89% | 2510 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,202 psi | 90% | 2490 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,998 psi | 87% | 2467 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,157 psi | 87% | 2464 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,998 psi | 88% | 2464 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2497 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,998 psi | 87% | 2520 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,405 psi | 90% | 2411 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,072 psi | 90% | 2487 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,200 psi | 85% | 2461 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,245 psi | 89% | 2382 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,143 psi | 88% | 2379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,331 psi | 87% | 2425 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 54,969 psi | 88% | 2470 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,694 psi | 88% | 2382 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,521 psi | 89% | 2480 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 56,014 psi | 90% | 2507 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,688 psi | 75% | 2474 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,071 psi | 88% | 2346 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,390 psi | 89% | 2365 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,505 psi | 86% | 2402 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,447 psi | 87% | 2418 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,085 psi | 87% | 2444 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,853 psi | 88% | 2513 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 54,418 psi | 87% | 2441 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,985 psi | 90% | 2461 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,766 psi | 86% | 2520 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,436 psi | 63% | 2365 fps | 98.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,405 psi | 89% | 2500 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,085 psi | 87% | 2484 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,275 psi | 90% | 2575 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,547 psi | 52% | 2290 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,808 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% | 50,676 psi | 81% | 2372 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,146 psi | 63% | 2211 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,847 psi | 74% | 2343 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,021 psi | 75% | 2320 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 37,014 psi | 59% | 2208 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,837 psi | 53% | 2188 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 42,801 psi | 69% | 2303 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,347 psi | 58% | 2172 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,846 psi | 72% | 2313 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 44,701 psi | 72% | 2297 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,402 psi | 84% | 2487 fps | 100% |
| Alliant Power Pro 2000-MR | 62.9 gr | 80% | 38,580 psi | 62% | 2326 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,824 psi | 57% | 2195 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,243 psi | 84% | 2352 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,580 psi | 62% | 2251 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,533 psi | 54% | 2198 fps | 95.6% |
| Alliant Reloder-17 | 61.9 gr | 80% | 30,777 psi | 49% | 2162 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,718 psi | 46% | 2113 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,230 psi | 56% | 2320 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,800 psi | 67% | 2310 fps | 98.1% |
| Bofors RP3 | <<locked>> | 80% | 35,288 psi | 57% | 2198 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 43,961 psi | 70% | 2306 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,717 psi | 75% | 2303 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,250 psi | 69% | 2329 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,674 psi | 76% | 2454 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,198 psi | 82% | 2392 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,953 psi | 83% | 2415 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,172 psi | 58% | 2198 fps | 96% |
| Hodgdon H414 | <<locked>> | 92% | 43,221 psi | 69% | 2379 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 92% | 47,485 psi | 76% | 2398 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 43,178 psi | 69% | 2316 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,906 psi | 46% | 2067 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,943 psi | 62% | 2290 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 94% | 46,296 psi | 74% | 2448 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,310 psi | 42% | 1316 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,452 psi | 66% | 2274 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 42,670 psi | 68% | 2310 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,145 psi | 61% | 2201 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,236 psi | 69% | 2267 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 52,620 psi | 84% | 2316 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 43,816 psi | 70% | 2329 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,091 psi | 69% | 2293 fps | 95.3% |
| IMR 4831 | <<locked>> | 86% | 31,966 psi | 51% | 2152 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 39,508 psi | 63% | 2277 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 44,846 psi | 72% | 2313 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 50,575 psi | 81% | 2385 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,669 psi | 67% | 2287 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,062 psi | 69% | 2251 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 38,116 psi | 61% | 2208 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 37,492 psi | 60% | 2198 fps | 95.4% |
| Lovex S070 | <<locked>> | 92% | 42,728 psi | 69% | 2316 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 41,945 psi | 67% | 2264 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 42,134 psi | 68% | 2270 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,956 psi | 61% | 2241 fps | 98.3% |
| Norma 204 | <<locked>> | 98% | 49,879 psi | 80% | 2457 fps | 95% |
| Norma URP | <<locked>> | 86% | 33,431 psi | 54% | 2192 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,246 psi | 60% | 2247 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 39,581 psi | 63% | 2320 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 44,643 psi | 72% | 2316 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,932 psi | 70% | 2333 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,211 psi | 77% | 2352 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 43% | 1348 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,125 psi | 80% | 2379 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,218 psi | 63% | 2231 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,176 psi | 64% | 2336 fps | 98.3% |
| ReloadSwiss RS 60 | 61.9 gr | 80% | 32,764 psi | 53% | 2221 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,983 psi | 56% | 2254 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,826 psi | 61% | 2310 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 45,847 psi | 74% | 2297 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,813 psi | 64% | 2221 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 33,199 psi | 53% | 2149 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 43,961 psi | 70% | 2306 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,492 psi | 60% | 2198 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,669 psi | 67% | 2287 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,116 psi | 61% | 2208 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 92% | 42,728 psi | 69% | 2316 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,185 psi | 55% | 2192 fps | 97.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,011 psi | 85% | 2369 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,873 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% | 43,265 psi | 69% | 2218 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,882 psi | 58% | 2106 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,901 psi | 67% | 2244 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 48,312 psi | 77% | 2382 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,946 psi | 69% | 2224 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,554 psi | 68% | 2293 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 34,229 psi | 55% | 2156 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 24,743 psi | 40% | 2005 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 48,921 psi | 78% | 2270 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,555 psi | 70% | 2215 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,146 psi | 63% | 2205 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,798 psi | 64% | 2215 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,445 psi | 52% | 2100 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 32,779 psi | 53% | 2146 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,802 psi | 72% | 2306 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,232 psi | 61% | 2205 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,316 psi | 55% | 2195 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 30,603 psi | 49% | 2182 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,935 psi | 46% | 2037 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 44,164 psi | 71% | 2346 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 43,410 psi | 70% | 2382 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,790 psi | 46% | 2178 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,567 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 104 powders for .375 H&H Mag. loaded with the .375 | 300gr | Swift A-Frame. 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 104 of the 104 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, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .375 H&H Mag. with the .375 | 300gr | Swift A-Frame 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.