Load Specifications
Bullet Manufacturer:Speer
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 | Speer AGS TBSS bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Power Pro 2000-MR.
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% | 56,333 psi | 90% | 2402 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,781 psi | 88% | 2431 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,491 psi | 87% | 2425 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 52,895 psi | 85% | 2441 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,128 psi | 87% | 2428 fps | 97.1% |
| Accurate 4064 | <<locked>> | 92% | 54,520 psi | 87% | 2467 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,838 psi | 86% | 2543 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 88% | 55,332 psi | 89% | 2497 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 56,173 psi | 90% | 2493 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,433 psi | 87% | 2454 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,056 psi | 88% | 2428 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,333 psi | 90% | 2546 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,737 psi | 88% | 2605 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,912 psi | 90% | 2513 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,130 psi | 90% | 2405 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,330 psi | 86% | 2490 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,938 psi | 83% | 2543 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,939 psi | 85% | 2579 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,941 psi | 59% | 2313 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,959 psi | 66% | 2451 fps | 97.6% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,984 psi | 88% | 2513 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 52,982 psi | 85% | 2484 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,534 psi | 86% | 2461 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,246 psi | 90% | 2434 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,505 psi | 86% | 2484 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,579 psi | 89% | 2572 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,230 psi | 89% | 2444 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,086 psi | 90% | 2470 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,201 psi | 87% | 2497 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 98% | 53,301 psi | 85% | 2543 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 96% | 54,433 psi | 87% | 2507 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 88% | 55,854 psi | 90% | 2507 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,124 psi | 77% | 2434 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,955 psi | 88% | 2536 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,954 psi | 87% | 2572 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,447 psi | 57% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,751 psi | 86% | 2464 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,738 psi | 89% | 2487 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,825 psi | 90% | 2480 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,101 psi | 90% | 2467 fps | 98.2% |
| IMR 4198 | <<locked>> | 82% | 56,086 psi | 90% | 2362 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 2480 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,303 psi | 89% | 2487 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,923 psi | 82% | 2490 fps | 99.5% |
| IMR 4895 | <<locked>> | 90% | 54,665 psi | 88% | 2516 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 54,433 psi | 87% | 2454 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,650 psi | 88% | 2441 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,853 psi | 88% | 2474 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,027 psi | 88% | 2431 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 55,434 psi | 89% | 2477 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,549 psi | 87% | 2480 fps | 99% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2513 fps | 98.3% |
| Norma 201 | <<locked>> | 88% | 54,143 psi | 87% | 2448 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,520 psi | 87% | 2448 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,912 psi | 90% | 2523 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,925 psi | 86% | 2523 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 53,069 psi | 85% | 2533 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 52,823 psi | 85% | 2503 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,779 psi | 83% | 2530 fps | 98.4% |
| Ramshot TAC | <<locked>> | 86% | 54,607 psi | 88% | 2470 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,143 psi | 87% | 2490 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,521 psi | 89% | 2457 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,752 psi | 57% | 1512 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,940 psi | 86% | 2434 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,694 psi | 88% | 2484 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,679 psi | 86% | 2549 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,779 psi | 85% | 2579 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,142 psi | 85% | 2562 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,287 psi | 85% | 2585 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 55,259 psi | 89% | 2428 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,607 psi | 88% | 2448 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,362 psi | 90% | 2520 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 53,534 psi | 86% | 2461 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,549 psi | 87% | 2480 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,853 psi | 88% | 2474 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,434 psi | 89% | 2477 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2513 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,621 psi | 88% | 2533 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,982 psi | 85% | 2454 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,795 psi | 86% | 2474 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,753 psi | 89% | 2392 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,869 psi | 90% | 2392 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,897 psi | 88% | 2438 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 55,666 psi | 89% | 2484 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,129 psi | 88% | 2392 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,130 psi | 90% | 2493 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 53,432 psi | 86% | 2477 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,427 psi | 76% | 2487 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,666 psi | 89% | 2356 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,941 psi | 90% | 2375 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,273 psi | 87% | 2415 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,114 psi | 88% | 2431 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,781 psi | 88% | 2457 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,709 psi | 89% | 2530 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 86% | 54,926 psi | 88% | 2451 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,243 psi | 85% | 2431 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 2533 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,987 psi | 64% | 2382 fps | 98.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,246 psi | 90% | 2513 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,607 psi | 88% | 2497 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,519 psi | 86% | 2543 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,982 psi | 53% | 2306 fps | 98.1% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,461 psi | 86% | 2480 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% | 46,905 psi | 75% | 2283 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,184 psi | 82% | 2385 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,508 psi | 63% | 2221 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,340 psi | 74% | 2352 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,701 psi | 72% | 2287 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 37,362 psi | 60% | 2218 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,272 psi | 53% | 2201 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 43,091 psi | 69% | 2313 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 36,767 psi | 59% | 2185 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,165 psi | 72% | 2320 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 45,324 psi | 73% | 2306 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,808 psi | 85% | 2497 fps | 100% |
| Alliant Power Pro 2000-MR | 63.6 gr | 80% | 39,015 psi | 63% | 2339 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,303 psi | 58% | 2208 fps | 98.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,852 psi | 85% | 2362 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,885 psi | 62% | 2257 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,010 psi | 51% | 2165 fps | 95% |
| Alliant Reloder-17 | 62.7 gr | 80% | 31,256 psi | 50% | 2178 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,124 psi | 47% | 2126 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,723 psi | 57% | 2339 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,221 psi | 68% | 2320 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 35,781 psi | 57% | 2208 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 44,527 psi | 71% | 2320 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,978 psi | 75% | 2310 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,758 psi | 70% | 2343 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,225 psi | 77% | 2467 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,779 psi | 83% | 2402 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,460 psi | 84% | 2425 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,608 psi | 59% | 2208 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 90% | 41,104 psi | 66% | 2346 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 92% | 47,877 psi | 77% | 2411 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 43,497 psi | 70% | 2323 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,441 psi | 44% | 2031 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,392 psi | 63% | 2303 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 92% | 43,816 psi | 70% | 2411 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 42% | 1319 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,742 psi | 67% | 2283 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 43,047 psi | 69% | 2316 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,595 psi | 62% | 2215 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,656 psi | 70% | 2277 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 53,040 psi | 85% | 2326 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 44,338 psi | 71% | 2343 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,453 psi | 70% | 2303 fps | 95.5% |
| IMR 4831 | <<locked>> | 86% | 32,387 psi | 52% | 2165 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 39,827 psi | 64% | 2287 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 45,165 psi | 72% | 2320 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 51,024 psi | 82% | 2395 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,177 psi | 68% | 2300 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,381 psi | 70% | 2260 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 38,450 psi | 62% | 2218 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 37,927 psi | 61% | 2211 fps | 95.6% |
| Lovex S070 | <<locked>> | 90% | 40,669 psi | 65% | 2283 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 42,279 psi | 68% | 2274 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 42,627 psi | 68% | 2283 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,276 psi | 61% | 2251 fps | 98.4% |
| Norma 204 | <<locked>> | 98% | 50,531 psi | 81% | 2474 fps | 95.3% |
| Norma URP | <<locked>> | 86% | 33,823 psi | 54% | 2205 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 37,637 psi | 60% | 2260 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 40,045 psi | 64% | 2333 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 45,020 psi | 72% | 2329 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,411 psi | 71% | 2346 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,805 psi | 78% | 2365 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 43% | 1352 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,618 psi | 81% | 2388 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,610 psi | 64% | 2244 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,698 psi | 65% | 2349 fps | 98.5% |
| ReloadSwiss RS 60 | 62.7 gr | 80% | 33,286 psi | 53% | 2238 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,141 psi | 53% | 2215 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,810 psi | 57% | 2270 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 46,427 psi | 74% | 2310 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,335 psi | 65% | 2234 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,678 psi | 54% | 2162 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 44,527 psi | 71% | 2320 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,927 psi | 61% | 2211 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,177 psi | 68% | 2300 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,450 psi | 62% | 2218 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 40,669 psi | 65% | 2283 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,592 psi | 55% | 2205 fps | 97.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,279 psi | 69% | 2306 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,640 psi | 67% | 2290 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,830 psi | 70% | 2231 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,332 psi | 58% | 2119 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 42,467 psi | 68% | 2257 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 48,762 psi | 78% | 2392 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,279 psi | 69% | 2234 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,004 psi | 69% | 2303 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 34,548 psi | 55% | 2165 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 25,048 psi | 40% | 2018 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 49,458 psi | 79% | 2280 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,092 psi | 71% | 2228 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,697 psi | 64% | 2218 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,306 psi | 65% | 2224 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,851 psi | 53% | 2113 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 33,185 psi | 53% | 2159 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 45,310 psi | 73% | 2320 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,682 psi | 62% | 2218 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,708 psi | 56% | 2208 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 31,082 psi | 50% | 2195 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,182 psi | 47% | 2047 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 44,657 psi | 72% | 2359 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 41,104 psi | 66% | 2346 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,095 psi | 47% | 2195 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,031 psi | 66% | 2293 fps | 99.3% |
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 | Speer AGS TBSS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,605 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,605 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 53–90 %, 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. ReloadSwiss RS 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .375 H&H Mag. with the .375 | 300gr | Speer AGS TBSS 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.