Load Specifications
Bullet:.375 | 300gr | Speer AGS SP
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 SP 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% | 56,072 psi | 90% | 2395 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,505 psi | 87% | 2425 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,230 psi | 87% | 2418 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,173 psi | 90% | 2477 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,737 psi | 86% | 2418 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 53,998 psi | 87% | 2461 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,388 psi | 86% | 2536 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 55,129 psi | 88% | 2490 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,970 psi | 90% | 2490 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,201 psi | 87% | 2448 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,766 psi | 88% | 2421 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,999 psi | 90% | 2539 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,389 psi | 87% | 2598 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,738 psi | 89% | 2510 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,811 psi | 89% | 2395 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,289 psi | 90% | 2526 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,576 psi | 83% | 2536 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,115 psi | 90% | 2618 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,666 psi | 59% | 2306 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,538 psi | 65% | 2438 fps | 97.4% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,563 psi | 87% | 2507 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 56,318 psi | 90% | 2523 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,376 psi | 90% | 2493 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,014 psi | 90% | 2428 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,069 psi | 85% | 2474 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,071 psi | 88% | 2562 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 54,694 psi | 88% | 2434 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,854 psi | 90% | 2464 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,766 psi | 86% | 2490 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 98% | 52,895 psi | 85% | 2533 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 96% | 54,041 psi | 87% | 2500 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 88% | 55,637 psi | 89% | 2500 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,732 psi | 77% | 2428 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,563 psi | 87% | 2530 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,708 psi | 86% | 2566 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,375 psi | 57% | 1476 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,287 psi | 85% | 2454 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,477 psi | 89% | 2480 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,419 psi | 89% | 2474 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,709 psi | 89% | 2457 fps | 98% |
| IMR 4198 | <<locked>> | 82% | 55,782 psi | 89% | 2356 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,113 psi | 85% | 2474 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,984 psi | 88% | 2477 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,546 psi | 81% | 2480 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 54,215 psi | 87% | 2507 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 54,201 psi | 87% | 2448 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,157 psi | 87% | 2431 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,404 psi | 87% | 2467 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,853 psi | 88% | 2425 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 55,230 psi | 89% | 2470 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,157 psi | 87% | 2474 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2503 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 53,708 psi | 86% | 2441 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,273 psi | 87% | 2441 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,448 psi | 89% | 2516 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,606 psi | 86% | 2513 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 52,678 psi | 84% | 2526 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 56,043 psi | 90% | 2543 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,445 psi | 82% | 2520 fps | 98.3% |
| Ramshot TAC | <<locked>> | 86% | 54,418 psi | 87% | 2467 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,693 psi | 86% | 2480 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,071 psi | 88% | 2451 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 57% | 1512 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,650 psi | 86% | 2428 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,302 psi | 87% | 2474 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,156 psi | 85% | 2539 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,130 psi | 90% | 2618 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,765 psi | 85% | 2556 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 2579 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 54,940 psi | 88% | 2425 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,143 psi | 87% | 2438 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,927 psi | 90% | 2513 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,376 psi | 90% | 2493 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,157 psi | 87% | 2474 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,404 psi | 87% | 2467 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,230 psi | 89% | 2470 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2503 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,215 psi | 87% | 2526 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,260 psi | 90% | 2493 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,403 psi | 86% | 2467 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,535 psi | 89% | 2385 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,376 psi | 89% | 2382 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,534 psi | 87% | 2431 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 55,201 psi | 89% | 2477 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,650 psi | 88% | 2385 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,709 psi | 89% | 2484 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 56,231 psi | 90% | 2510 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,065 psi | 75% | 2480 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,390 psi | 89% | 2352 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,680 psi | 89% | 2372 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,795 psi | 86% | 2405 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,694 psi | 88% | 2421 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,346 psi | 87% | 2448 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2523 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 86% | 54,679 psi | 88% | 2448 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,217 psi | 90% | 2464 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,201 psi | 87% | 2526 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,624 psi | 64% | 2372 fps | 98.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,767 psi | 89% | 2503 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,331 psi | 87% | 2490 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,156 psi | 85% | 2536 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,793 psi | 53% | 2297 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,055 psi | 85% | 2474 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% | 46,586 psi | 75% | 2277 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,894 psi | 82% | 2379 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,218 psi | 63% | 2215 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,122 psi | 74% | 2349 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,210 psi | 76% | 2323 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 37,086 psi | 59% | 2211 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,025 psi | 53% | 2195 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 42,844 psi | 69% | 2306 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,564 psi | 59% | 2178 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,904 psi | 72% | 2313 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 44,991 psi | 72% | 2303 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,431 psi | 84% | 2490 fps | 100% |
| Alliant Power Pro 2000-MR | 63.2 gr | 80% | 38,798 psi | 62% | 2333 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,056 psi | 58% | 2201 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,547 psi | 84% | 2356 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,653 psi | 62% | 2251 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,736 psi | 54% | 2205 fps | 95.7% |
| Alliant Reloder-17 | 62.2 gr | 80% | 30,951 psi | 50% | 2169 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,848 psi | 46% | 2119 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,331 psi | 57% | 2326 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,843 psi | 67% | 2310 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 35,520 psi | 57% | 2201 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 44,164 psi | 71% | 2310 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,731 psi | 75% | 2303 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,497 psi | 70% | 2336 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,950 psi | 77% | 2461 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,488 psi | 83% | 2395 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,214 psi | 84% | 2418 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,376 psi | 58% | 2201 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 90% | 40,785 psi | 65% | 2336 fps | 95% |
| Hodgdon H4350 | <<locked>> | 92% | 47,674 psi | 76% | 2405 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 43,250 psi | 69% | 2316 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,066 psi | 47% | 2073 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,160 psi | 63% | 2293 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 94% | 46,615 psi | 75% | 2457 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 42% | 1316 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,495 psi | 67% | 2277 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 42,728 psi | 69% | 2310 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,348 psi | 61% | 2208 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,468 psi | 70% | 2270 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 52,678 psi | 84% | 2320 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 44,034 psi | 71% | 2333 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,279 psi | 69% | 2297 fps | 95.4% |
| IMR 4831 | <<locked>> | 86% | 32,184 psi | 52% | 2159 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,581 psi | 63% | 2280 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 44,904 psi | 72% | 2313 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 50,589 psi | 81% | 2385 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,727 psi | 67% | 2290 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,134 psi | 69% | 2254 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 38,189 psi | 61% | 2211 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 37,695 psi | 60% | 2205 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 40,321 psi | 65% | 2274 fps | 95% |
| Norma 201 | <<locked>> | 80% | 42,018 psi | 67% | 2267 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 42,366 psi | 68% | 2277 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,029 psi | 61% | 2241 fps | 98.3% |
| Norma 204 | <<locked>> | 98% | 49,995 psi | 80% | 2461 fps | 95.1% |
| Norma URP | <<locked>> | 86% | 33,634 psi | 54% | 2198 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 37,434 psi | 60% | 2254 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 39,900 psi | 64% | 2326 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 44,802 psi | 72% | 2323 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,179 psi | 71% | 2339 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,370 psi | 78% | 2359 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,687 psi | 43% | 1348 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,386 psi | 81% | 2385 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,421 psi | 63% | 2238 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,393 psi | 65% | 2343 fps | 98.4% |
| ReloadSwiss RS 60 | 62.2 gr | 80% | 32,967 psi | 53% | 2228 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,837 psi | 53% | 2208 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,956 psi | 61% | 2316 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 46,122 psi | 74% | 2303 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,074 psi | 64% | 2228 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,446 psi | 54% | 2152 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 44,164 psi | 71% | 2310 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,695 psi | 60% | 2205 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,727 psi | 67% | 2290 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,189 psi | 61% | 2211 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 90% | 40,321 psi | 65% | 2274 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,403 psi | 55% | 2198 fps | 97.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,902 psi | 69% | 2297 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,437 psi | 66% | 2283 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,540 psi | 70% | 2224 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,085 psi | 58% | 2113 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 42,105 psi | 68% | 2247 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 48,341 psi | 78% | 2385 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,033 psi | 69% | 2228 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,583 psi | 68% | 2297 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 34,301 psi | 55% | 2159 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 24,874 psi | 40% | 2011 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 49,153 psi | 79% | 2274 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,801 psi | 70% | 2221 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,407 psi | 63% | 2211 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,059 psi | 64% | 2221 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,634 psi | 52% | 2106 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 32,982 psi | 53% | 2152 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 45,020 psi | 72% | 2313 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,450 psi | 62% | 2211 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,519 psi | 55% | 2201 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 92% | 30,777 psi | 49% | 2185 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,950 psi | 46% | 2037 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 44,411 psi | 71% | 2352 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 40,901 psi | 66% | 2339 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,892 psi | 46% | 2185 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,799 psi | 65% | 2287 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 | Speer AGS SP. Alliant Reloder-17 delivers the highest muzzle velocity at 2,618 fps; across all powders the maximum-charge window runs from 1,476 fps to 2,618 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. 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 | Speer AGS SP 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.