Load Specifications
Bullet:.375 | 270gr | Atomic 29 HP
Bullet Manufacturer:Atomic 29
Bullet Weight:270 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:1:17.0
Load data in caliber .375 H&H Mag. with .375 | 270gr | Atomic 29 HP bullet and 100 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 52 and Hodgdon CFE223.
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>> | 90% | 53,969 psi | 87% | 2493 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 54,723 psi | 88% | 2585 fps | 99.1% |
| Accurate 2230 | <<locked>> | 82% | 55,317 psi | 89% | 2592 fps | 99.3% |
| Accurate 2460 | <<locked>> | 88% | 56,159 psi | 90% | 2566 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 53,896 psi | 86% | 2546 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 53,809 psi | 86% | 2572 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 53,635 psi | 86% | 2582 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,627 psi | 68% | 2487 fps | 96.7% |
| Accurate LT-30 | <<locked>> | 84% | 54,578 psi | 88% | 2448 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,042 psi | 88% | 2470 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,156 psi | 85% | 2579 fps | 99.4% |
| ADI AR 2207 | <<locked>> | 82% | 55,883 psi | 90% | 2461 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 54,157 psi | 87% | 2572 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 84% | 54,839 psi | 88% | 2559 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 56,086 psi | 90% | 2585 fps | 100% |
| Alliant AR-Comp | <<locked>> | 92% | 55,564 psi | 89% | 2566 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,027 psi | 87% | 2631 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 56,246 psi | 90% | 2730 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,040 psi | 85% | 2589 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,215 psi | 87% | 2503 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 53,983 psi | 87% | 2608 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,569 psi | 70% | 2500 fps | 96.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2638 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,592 psi | 86% | 2451 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 52,794 psi | 85% | 2589 fps | 98.7% |
| Bofors RP3 | <<locked>> | 98% | 52,982 psi | 85% | 2602 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,897 psi | 88% | 2526 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 54,621 psi | 88% | 2612 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 52,968 psi | 85% | 2651 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 86% | 53,359 psi | 86% | 2543 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 54,375 psi | 87% | 2566 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 55,027 psi | 88% | 2612 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 92% | 53,606 psi | 86% | 2589 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,552 psi | 63% | 2392 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 55,637 psi | 89% | 2661 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,272 psi | 55% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,274 psi | 89% | 2592 fps | 99.8% |
| IMR 3031 | <<locked>> | 94% | 56,217 psi | 90% | 2621 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,563 psi | 86% | 2556 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 94% | 54,563 psi | 87% | 2536 fps | 96.2% |
| IMR 4198 | <<locked>> | 86% | 55,056 psi | 88% | 2467 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 53,490 psi | 86% | 2552 fps | 95.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,002 psi | 66% | 2438 fps | 96.3% |
| IMR 4895 | <<locked>> | 96% | 55,361 psi | 89% | 2638 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 92% | 56,086 psi | 90% | 2585 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 56,072 psi | 90% | 2572 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 56,130 psi | 90% | 2575 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 55,419 psi | 89% | 2602 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 53,621 psi | 86% | 2513 fps | 99.4% |
| Lovex S062 | <<locked>> | 98% | 55,985 psi | 90% | 2595 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,602 psi | 78% | 2493 fps | 96.5% |
| Norma 200 | <<locked>> | 82% | 53,795 psi | 86% | 2474 fps | 100% |
| Norma 201 | <<locked>> | 94% | 55,143 psi | 88% | 2572 fps | 100% |
| Norma 202 | <<locked>> | 94% | 55,521 psi | 89% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,084 psi | 85% | 2598 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 43,207 psi | 69% | 2484 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 96% | 53,519 psi | 86% | 2621 fps | 99.4% |
| Ramshot TAC | <<locked>> | 90% | 53,113 psi | 85% | 2549 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 92% | 55,651 psi | 89% | 2618 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,925 psi | 86% | 2543 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,577 psi | 55% | 1558 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 55,956 psi | 90% | 2572 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 55,985 psi | 90% | 2598 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 53,635 psi | 86% | 2667 fps | 99.2% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 53,519 psi | 86% | 2700 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 42,888 psi | 69% | 2507 fps | 96.3% |
| Rottweil R 901 | <<locked>> | 92% | 56,014 psi | 90% | 2559 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 55,405 psi | 89% | 2569 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 52,649 psi | 84% | 2585 fps | 99.7% |
| Shooters World AR Plus | <<locked>> | 82% | 56,072 psi | 90% | 2572 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,602 psi | 78% | 2493 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 94% | 55,419 psi | 89% | 2602 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 55,985 psi | 90% | 2595 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 56,014 psi | 90% | 2546 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,303 psi | 89% | 2224 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 55,100 psi | 88% | 2569 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,071 psi | 88% | 2651 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 55,332 psi | 89% | 2523 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 54,520 psi | 87% | 2575 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 54,882 psi | 88% | 2598 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,331 psi | 87% | 2484 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 53,795 psi | 86% | 2480 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 53,722 psi | 86% | 2572 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 53,113 psi | 85% | 2480 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 53,998 psi | 87% | 2569 fps | 99.4% |
| Somchem S355ᴾ | <<locked>> | 100% | 53,621 psi | 86% | 2589 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,319 psi | 61% | 2438 fps | 98.6% |
| Vihtavuori N120 | <<locked>> | 82% | 55,767 psi | 89% | 2415 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 54,099 psi | 87% | 2454 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,230 psi | 87% | 2474 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 54,331 psi | 87% | 2539 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 56,202 psi | 90% | 2559 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 51,735 psi | 83% | 2530 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,745 psi | 73% | 2490 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 90% | 53,185 psi | 85% | 2539 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 54,244 psi | 87% | 2559 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,570 psi | 71% | 2490 fps | 96.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,050 psi | 75% | 2480 fps | 99% |
| Winchester 748 | <<locked>> | 92% | 55,709 psi | 89% | 2628 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 54,636 psi | 88% | 2608 fps | 99.8% |
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% | 39,392 psi | 63% | 2287 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,010 psi | 82% | 2530 fps | 98.6% |
| Accurate 2230 | <<locked>> | 80% | 51,547 psi | 83% | 2539 fps | 98.9% |
| Accurate 2460 | <<locked>> | 80% | 42,757 psi | 69% | 2379 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 31,546 psi | 51% | 2195 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 37,971 psi | 61% | 2329 fps | 99.3% |
| Accurate 4064 | <<locked>> | 80% | 29,907 psi | 48% | 2178 fps | 98.4% |
| Accurate 4350 | <<locked>> | 96% | 36,956 psi | 59% | 2382 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 48,269 psi | 77% | 2365 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,675 psi | 78% | 2385 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,318 psi | 58% | 2290 fps | 96.2% |
| ADI AR 2207 | <<locked>> | 80% | 52,605 psi | 84% | 2421 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 37,362 psi | 60% | 2293 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 47,877 psi | 77% | 2467 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,334 psi | 61% | 2306 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 37,115 psi | 60% | 2310 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,266 psi | 71% | 2480 fps | 98.8% |
| Alliant Power Pro 2000-MR | 62.7 gr | 84% | 37,333 psi | 60% | 2392 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 31,618 psi | 51% | 2211 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,976 psi | 72% | 2379 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 34,432 psi | 55% | 2270 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 96% | 38,435 psi | 62% | 2395 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 88% | 33,533 psi | 54% | 2320 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,963 psi | 75% | 2362 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 37,710 psi | 60% | 2336 fps | 95.3% |
| Bofors RP3 | <<locked>> | 82% | 30,777 psi | 49% | 2208 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,437 psi | 65% | 2303 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,071 psi | 58% | 2313 fps | 98.1% |
| Hodgdon CFE223 | 61.1 gr | 80% | 39,798 psi | 64% | 2428 fps | 96.7% |
| Hodgdon H322 | <<locked>> | 80% | 43,700 psi | 70% | 2402 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,295 psi | 71% | 2425 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 39,291 psi | 63% | 2359 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 36,521 psi | 59% | 2300 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 32,706 psi | 52% | 2247 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,547 psi | 52% | 2260 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,396 psi | 41% | 1358 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,273 psi | 57% | 2257 fps | 96.4% |
| IMR 3031 | <<locked>> | 80% | 35,331 psi | 57% | 2306 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,534 psi | 55% | 2228 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 92% | 51,256 psi | 82% | 2487 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 46,064 psi | 74% | 2349 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 50,241 psi | 81% | 2503 fps | 95.1% |
| IMR 4831 | <<locked>> | 98% | 38,392 psi | 62% | 2388 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 32,967 psi | 53% | 2247 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 38,334 psi | 61% | 2306 fps | 98% |
| Lovex D073.4 | <<locked>> | 80% | 52,243 psi | 84% | 2523 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,554 psi | 68% | 2379 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 34,287 psi | 55% | 2267 fps | 98.6% |
| Lovex S060 | <<locked>> | 80% | 37,362 psi | 60% | 2244 fps | 96.6% |
| Lovex S062 | <<locked>> | 80% | 31,937 psi | 51% | 2188 fps | 96.3% |
| Lovex S065 | <<locked>> | 96% | 42,844 psi | 69% | 2398 fps | 95% |
| Norma 200 | <<locked>> | 80% | 50,676 psi | 81% | 2434 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,476 psi | 57% | 2251 fps | 97.4% |
| Norma 202 | <<locked>> | 80% | 35,578 psi | 57% | 2267 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 33,779 psi | 54% | 2260 fps | 95.4% |
| Norma URP | <<locked>> | 96% | 38,101 psi | 61% | 2388 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 84% | 35,592 psi | 57% | 2316 fps | 95.7% |
| Ramshot TAC | <<locked>> | 84% | 43,642 psi | 70% | 2398 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,130 psi | 60% | 2316 fps | 96.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,669 psi | 67% | 2349 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,599 psi | 41% | 1391 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,134 psi | 69% | 2388 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 45,919 psi | 74% | 2448 fps | 95% |
| ReloadSwiss RS 52 | 59.4 gr | 82% | 35,563 psi | 57% | 2352 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,499 psi | 44% | 2165 fps | 95% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 39,987 psi | 64% | 2454 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 38,972 psi | 62% | 2297 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 33,692 psi | 54% | 2205 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 84% | 30,850 psi | 49% | 2201 fps | 95.2% |
| Shooters World AR Plus | <<locked>> | 80% | 52,243 psi | 84% | 2523 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 96% | 42,844 psi | 69% | 2398 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,287 psi | 55% | 2267 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 31,937 psi | 51% | 2188 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,513 psi | 73% | 2398 fps | 99% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,373 psi | 84% | 2192 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,167 psi | 77% | 2474 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 34,824 psi | 56% | 2303 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,803 psi | 73% | 2395 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 41,307 psi | 66% | 2369 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,838 psi | 56% | 2257 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,275 psi | 60% | 2224 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,400 psi | 49% | 2103 fps | 98.9% |
| Somchem S321 | <<locked>> | 80% | 40,799 psi | 65% | 2372 fps | 98.8% |
| Somchem S335 | <<locked>> | 80% | 36,738 psi | 59% | 2231 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 35,636 psi | 57% | 2267 fps | 95.9% |
| Somchem S355 | <<locked>> | 84% | 32,213 psi | 52% | 2215 fps | 95.4% |
| Somchem S365 | <<locked>> | 92% | 29,631 psi | 48% | 2234 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 52,518 psi | 84% | 2375 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,409 psi | 68% | 2297 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,420 psi | 60% | 2231 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,460 psi | 52% | 2201 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,576 psi | 54% | 2208 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 28,703 psi | 46% | 2116 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 96% | 40,161 psi | 64% | 2392 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 38,116 psi | 61% | 2300 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 32,169 psi | 52% | 2195 fps | 98.4% |
| Vihtavuori N550 | <<locked>> | 96% | 39,160 psi | 63% | 2395 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 33,779 psi | 54% | 2234 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 36,941 psi | 59% | 2333 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,837 psi | 54% | 2257 fps | 96.1% |
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 100 powders for .375 H&H Mag. loaded with the .375 | 270gr | Atomic 29 HP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,730 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,730 fps. Accurate 4350 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 270.0 gr projectile in 0.375" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 52, Hodgdon CFE223 rank at the top here: for .375 H&H Mag. with the .375 | 270gr | Atomic 29 HP 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.