Load Specifications
Bullet Manufacturer:Hammer
Bullet Weight:305 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Blaser Mag. load data
Case Length (l3):2.814"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:107.5 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:25.6"
Max. allowed Pressure:60,916 psi
Recommended Twist Rate:1:17.0
Load data in caliber .375 Blaser Mag. with .375 | 305gr | Hammer Stone Hammer 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 70, 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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 54,389 psi | 89% | 2474 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 52,808 psi | 87% | 2487 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,744 psi | 73% | 2467 fps | 98.5% |
| Accurate 4064 | <<locked>> | 88% | 54,462 psi | 89% | 2523 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,143 psi | 89% | 2615 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 54,447 psi | 89% | 2552 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 52,040 psi | 85% | 2510 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,272 psi | 86% | 2602 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,287 psi | 87% | 2503 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,534 psi | 90% | 2470 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,998 psi | 89% | 2667 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 52,286 psi | 86% | 2530 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 52,663 psi | 86% | 2549 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 51,822 psi | 85% | 2618 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 52,736 psi | 87% | 2644 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,314 psi | 84% | 2592 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 44,976 psi | 74% | 2536 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,279 psi | 69% | 2490 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,289 psi | 61% | 2408 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,558 psi | 78% | 2651 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,085 psi | 89% | 2572 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 52,779 psi | 87% | 2546 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 44,976 psi | 74% | 2536 fps | 96.3% |
| Bofors RP7 | <<locked>> | 92% | 52,765 psi | 87% | 2526 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,868 psi | 90% | 2484 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,562 psi | 86% | 2530 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,577 psi | 88% | 2559 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 53,258 psi | 87% | 2615 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 92% | 53,722 psi | 88% | 2579 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 84% | 54,998 psi | 90% | 2559 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,100 psi | 90% | 2592 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,476 psi | 89% | 2592 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,476 psi | 88% | 2651 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,940 psi | 59% | 1539 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 52,591 psi | 86% | 2516 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 51,822 psi | 85% | 2493 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,781 psi | 90% | 2536 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,505 psi | 89% | 2523 fps | 99% |
| IMR 4350 | <<locked>> | 96% | 53,069 psi | 87% | 2552 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,505 psi | 89% | 2552 fps | 99% |
| IMR 4831 | <<locked>> | 98% | 54,737 psi | 90% | 2608 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 53,998 psi | 89% | 2572 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,287 psi | 87% | 2503 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,331 psi | 89% | 2526 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,780 psi | 88% | 2484 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,839 psi | 90% | 2533 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,143 psi | 89% | 2549 fps | 99.7% |
| Lovex S070 | <<locked>> | 96% | 55,085 psi | 90% | 2585 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,086 psi | 61% | 2333 fps | 96.8% |
| Norma 201 | <<locked>> | 84% | 53,084 psi | 87% | 2500 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,664 psi | 88% | 2497 fps | 100% |
| Norma 203B | <<locked>> | 86% | 51,924 psi | 85% | 2536 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,388 psi | 88% | 2598 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 47,369 psi | 78% | 2612 fps | 98.2% |
| Norma URP | <<locked>> | 96% | 53,272 psi | 87% | 2605 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 52,301 psi | 86% | 2562 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 51,808 psi | 85% | 2605 fps | 99.4% |
| Ramshot TAC | <<locked>> | 82% | 53,185 psi | 87% | 2526 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,142 psi | 87% | 2543 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,434 psi | 60% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,621 psi | 88% | 2543 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,084 psi | 87% | 2608 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,518 psi | 86% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,737 psi | 88% | 2638 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 52,939 psi | 87% | 2664 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 54,244 psi | 89% | 2477 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,838 psi | 88% | 2500 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 52,678 psi | 86% | 2536 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 54,128 psi | 89% | 2575 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,995 psi | 82% | 2575 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 52,765 psi | 87% | 2526 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,143 psi | 89% | 2549 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,331 psi | 89% | 2526 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,839 psi | 90% | 2533 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,085 psi | 90% | 2585 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,302 psi | 89% | 2595 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 51,924 psi | 85% | 2510 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 52,663 psi | 86% | 2526 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,520 psi | 90% | 2438 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,839 psi | 90% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,012 psi | 89% | 2503 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 49,516 psi | 81% | 2569 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 53,853 psi | 88% | 2434 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,100 psi | 90% | 2546 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 52,997 psi | 87% | 2536 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,940 psi | 90% | 2648 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,894 psi | 84% | 2556 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 84% | 54,882 psi | 90% | 2421 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,592 psi | 88% | 2461 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,099 psi | 89% | 2477 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,288 psi | 89% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 52,228 psi | 86% | 2552 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 43,859 psi | 72% | 2434 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 82% | 53,563 psi | 88% | 2500 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 52,373 psi | 86% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,636 psi | 90% | 2605 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,862 psi | 77% | 2556 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 51,822 psi | 85% | 2526 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,795 psi | 88% | 2546 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,447 psi | 88% | 2618 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,971 psi | 62% | 2523 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 52,663 psi | 86% | 2536 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 47,529 psi | 78% | 2497 fps | 96.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 44,846 psi | 74% | 2352 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,511 psi | 71% | 2343 fps | 96.4% |
| Accurate 3100 | <<locked>> | 92% | 34,055 psi | 56% | 2270 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 42,453 psi | 70% | 2356 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,357 psi | 51% | 2218 fps | 96.7% |
| ADI AR 2206H | <<locked>> | 80% | 47,892 psi | 79% | 2457 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 40,857 psi | 67% | 2329 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 94% | 43,120 psi | 71% | 2448 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,995 psi | 82% | 2457 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,155 psi | 84% | 2431 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,976 psi | 72% | 2510 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,814 psi | 67% | 2352 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,555 psi | 72% | 2408 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,647 psi | 52% | 2234 fps | 96.9% |
| Alliant Reloder-17 | 69.7 gr | 80% | 35,273 psi | 58% | 2346 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 42,496 psi | 70% | 2444 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 42,163 psi | 69% | 2484 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 25,904 psi | 43% | 2110 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 96% | 33,011 psi | 54% | 2306 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 88% | 31,372 psi | 52% | 2316 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,297 psi | 78% | 2474 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 40,640 psi | 67% | 2359 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 42,163 psi | 69% | 2484 fps | 95.5% |
| Bofors RP7 | <<locked>> | 82% | 38,653 psi | 63% | 2287 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,547 psi | 85% | 2438 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,313 psi | 81% | 2487 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,234 psi | 68% | 2365 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 35,955 psi | 59% | 2313 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 84% | 41,785 psi | 69% | 2382 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 48,414 psi | 79% | 2467 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,153 psi | 48% | 2142 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,614 psi | 73% | 2451 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 37,521 psi | 62% | 2372 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 44% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,398 psi | 76% | 2425 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 48,602 psi | 80% | 2451 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,888 psi | 70% | 2359 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,266 psi | 74% | 2382 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 38,899 psi | 64% | 2316 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,739 psi | 62% | 2270 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 30,516 psi | 50% | 2185 fps | 96.4% |
| IMR 4895 | <<locked>> | 80% | 44,657 psi | 73% | 2434 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 49,995 psi | 82% | 2457 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,616 psi | 78% | 2438 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,572 psi | 78% | 2395 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 42,902 psi | 70% | 2359 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 35,360 psi | 58% | 2228 fps | 96.5% |
| Lovex S070 | <<locked>> | 82% | 35,737 psi | 59% | 2254 fps | 95.4% |
| Lovex S071 | <<locked>> | 96% | 32,721 psi | 54% | 2241 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 47,021 psi | 77% | 2411 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,514 psi | 78% | 2415 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,946 psi | 71% | 2398 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 43,816 psi | 72% | 2444 fps | 95.5% |
| Norma MRP | <<locked>> | 92% | 36,216 psi | 59% | 2392 fps | 95% |
| Norma URP | <<locked>> | 80% | 31,691 psi | 52% | 2221 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 80% | 42,757 psi | 70% | 2418 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 32,938 psi | 54% | 2254 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 49,835 psi | 82% | 2477 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,676 psi | 82% | 2493 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 45% | 1407 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,466 psi | 68% | 2349 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,369 psi | 76% | 2510 fps | 99.9% |
| ReloadSwiss RS 60 | 69.7 gr | 80% | 37,507 psi | 62% | 2395 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,067 psi | 51% | 2234 fps | 96.2% |
| ReloadSwiss RS 70 | 70.8 gr | 80% | 31,024 psi | 51% | 2234 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 51,097 psi | 84% | 2434 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,860 psi | 74% | 2372 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,174 psi | 63% | 2310 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 96% | 47,616 psi | 78% | 2477 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 41,205 psi | 68% | 2425 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 82% | 38,653 psi | 63% | 2287 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,360 psi | 58% | 2228 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,616 psi | 78% | 2438 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,902 psi | 70% | 2359 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 35,737 psi | 59% | 2254 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,102 psi | 64% | 2359 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,472 psi | 80% | 2457 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,427 psi | 76% | 2434 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,153 psi | 79% | 2356 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,306 psi | 66% | 2241 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 36,883 psi | 61% | 2224 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 40,828 psi | 67% | 2421 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 47,863 psi | 79% | 2359 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,153 psi | 79% | 2451 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 38,899 psi | 64% | 2313 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 28,500 psi | 47% | 2182 fps | 98.7% |
| Somchem S385 | <<locked>> | 92% | 39,117 psi | 64% | 2362 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 48,573 psi | 80% | 2343 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,512 psi | 73% | 2343 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,889 psi | 74% | 2352 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,999 psi | 61% | 2254 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 32,996 psi | 54% | 2221 fps | 97% |
| Vihtavuori N165 | <<locked>> | 98% | 41,060 psi | 67% | 2385 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 50,328 psi | 83% | 2457 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,337 psi | 71% | 2352 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,590 psi | 54% | 2224 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 82% | 26,165 psi | 43% | 2129 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,634 psi | 54% | 2201 fps | 98.8% |
| Winchester 748 | <<locked>> | 80% | 50,198 psi | 82% | 2497 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 36,100 psi | 59% | 2316 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 24,366 psi | 40% | 2129 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,151 psi | 76% | 2441 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 44,353 psi | 73% | 2444 fps | 95.7% |
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 Blaser Mag. loaded with the .375 | 305gr | Hammer Stone Hammer. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,667 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,667 fps. Accurate 3100 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 (420 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 305.0 gr projectile in 0.375" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .375 Blaser Mag. with the .375 | 305gr | Hammer Stone Hammer 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.