Load Specifications
Bullet:.375 | 250gr | Speer TBBC
Bullet Manufacturer:Speer
Bullet Weight:250 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:9.5 x 66 SE v. Hofe load data
Case Length (l3):2.598"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:106 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:25.6"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:6.0
Load data in caliber 9.5 x 66 SE v. Hofe with .375 | 250gr | Speer TBBC bullet and 106 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 Power Pro 2000-MR and ReloadSwiss RS 52.
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 2015 | <<locked>> | 86% | 55,158 psi | 86% | 2710 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 57,377 psi | 90% | 2785 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 56,985 psi | 89% | 2776 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,390 psi | 87% | 2799 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,652 psi | 89% | 2776 fps | 97% |
| Accurate 4064 | <<locked>> | 94% | 56,652 psi | 89% | 2822 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,504 psi | 82% | 2848 fps | 99.3% |
| Accurate LT-30 | <<locked>> | 82% | 57,522 psi | 90% | 2697 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 54,302 psi | 85% | 2808 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 55,172 psi | 86% | 2805 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,826 psi | 89% | 2812 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 57,508 psi | 90% | 2782 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,085 psi | 86% | 2864 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,348 psi | 90% | 2979 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,955 psi | 86% | 2828 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,897 psi | 86% | 2713 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,666 psi | 87% | 2851 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,937 psi | 80% | 2851 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,622 psi | 87% | 2946 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,245 psi | 57% | 2589 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,176 psi | 63% | 2733 fps | 96.6% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,826 psi | 89% | 2694 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 57,740 psi | 90% | 2877 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 55,463 psi | 87% | 2844 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,825 psi | 87% | 2808 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,361 psi | 87% | 2746 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,043 psi | 88% | 2841 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,230 psi | 85% | 2884 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 57,537 psi | 90% | 2802 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,071 psi | 86% | 2782 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,739 psi | 89% | 2858 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,695 psi | 87% | 2897 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 98% | 56,724 psi | 89% | 2861 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 54,824 psi | 86% | 2822 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,166 psi | 74% | 2733 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 57,450 psi | 90% | 2900 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,101 psi | 89% | 2940 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,215 psi | 55% | 1696 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,028 psi | 88% | 2822 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,491 psi | 85% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,737 psi | 86% | 2789 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,984 psi | 86% | 2769 fps | 97.5% |
| IMR 4198 | <<locked>> | 82% | 55,071 psi | 86% | 2674 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,460 psi | 82% | 2779 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 98% | 57,711 psi | 90% | 2838 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,850 psi | 78% | 2789 fps | 99.1% |
| IMR 4895 | <<locked>> | 92% | 57,145 psi | 90% | 2881 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 56,826 psi | 89% | 2812 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,261 psi | 90% | 2799 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 57,450 psi | 90% | 2835 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 57,435 psi | 90% | 2785 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 54,462 psi | 85% | 2789 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,913 psi | 89% | 2831 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,215 psi | 85% | 2815 fps | 97.7% |
| Norma 201 | <<locked>> | 90% | 56,391 psi | 88% | 2802 fps | 100% |
| Norma 202 | <<locked>> | 90% | 56,869 psi | 89% | 2805 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,824 psi | 86% | 2838 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 51,837 psi | 81% | 2838 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 55,216 psi | 87% | 2861 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,879 psi | 80% | 2831 fps | 97.8% |
| Ramshot TAC | <<locked>> | 88% | 57,334 psi | 90% | 2831 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,782 psi | 89% | 2848 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,404 psi | 85% | 2762 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,534 psi | 56% | 1736 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,434 psi | 88% | 2792 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,276 psi | 90% | 2838 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,072 psi | 88% | 2917 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,376 psi | 87% | 2946 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,214 psi | 82% | 2871 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,402 psi | 82% | 2894 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 88% | 57,479 psi | 90% | 2785 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,898 psi | 89% | 2802 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,317 psi | 87% | 2831 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,825 psi | 87% | 2808 fps | 97.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,913 psi | 89% | 2831 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 57,450 psi | 90% | 2835 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,462 psi | 85% | 2789 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,215 psi | 85% | 2815 fps | 97.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,028 psi | 88% | 2762 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 57,130 psi | 90% | 2894 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,724 psi | 87% | 2736 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,593 psi | 87% | 2808 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,246 psi | 88% | 2831 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,708 psi | 86% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,665 psi | 86% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 2785 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 54,578 psi | 86% | 2795 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 57,377 psi | 90% | 2740 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,027 psi | 86% | 2799 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 55,680 psi | 87% | 2831 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,383 psi | 73% | 2789 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,505 psi | 85% | 2661 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,824 psi | 86% | 2680 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,260 psi | 88% | 2762 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 57,421 psi | 90% | 2782 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,203 psi | 90% | 2808 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,447 psi | 85% | 2835 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 88% | 57,493 psi | 90% | 2812 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,680 psi | 87% | 2782 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,592 psi | 84% | 2841 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,044 psi | 61% | 2664 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2818 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 57,232 psi | 90% | 2861 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,927 psi | 88% | 2900 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,387 psi | 51% | 2569 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,956 psi | 88% | 2838 fps | 100% |
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 2015 | <<locked>> | 80% | 45,919 psi | 72% | 2579 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,140 psi | 79% | 2687 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,566 psi | 60% | 2503 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,237 psi | 71% | 2648 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,806 psi | 78% | 2671 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 36,477 psi | 57% | 2497 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,664 psi | 54% | 2520 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 54,012 psi | 85% | 2651 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,177 psi | 66% | 2602 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 80% | 35,882 psi | 56% | 2457 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,208 psi | 69% | 2612 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 44,077 psi | 69% | 2605 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,532 psi | 81% | 2812 fps | 99.9% |
| Alliant Power Pro 2000-MR | 72 gr | 80% | 38,101 psi | 60% | 2621 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,317 psi | 55% | 2477 fps | 97.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,648 psi | 81% | 2671 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,985 psi | 60% | 2536 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,215 psi | 55% | 2533 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,443 psi | 48% | 2434 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,211 psi | 47% | 2428 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,507 psi | 59% | 2671 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,388 psi | 84% | 2651 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,307 psi | 65% | 2605 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 34,867 psi | 55% | 2480 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 46,296 psi | 73% | 2651 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,137 psi | 72% | 2605 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,772 psi | 67% | 2635 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,050 psi | 74% | 2769 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 80% | 50,502 psi | 79% | 2707 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,576 psi | 81% | 2733 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,752 psi | 56% | 2480 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 92% | 42,859 psi | 67% | 2680 fps | 95% |
| Hodgdon H4350 | <<locked>> | 94% | 50,024 psi | 78% | 2756 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,511 psi | 67% | 2615 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,298 psi | 47% | 2379 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,392 psi | 60% | 2582 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 94% | 46,108 psi | 72% | 2756 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,194 psi | 41% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,872 psi | 64% | 2569 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 41,916 psi | 66% | 2612 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,623 psi | 59% | 2487 fps | 97.2% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,629 psi | 72% | 2612 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 51,793 psi | 81% | 2631 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 46,253 psi | 72% | 2677 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,382 psi | 71% | 2638 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 33,634 psi | 53% | 2477 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 38,841 psi | 61% | 2569 fps | 98.1% |
| IMR 8208 XBR | <<locked>> | 80% | 44,208 psi | 69% | 2612 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 49,864 psi | 78% | 2694 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,060 psi | 64% | 2585 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,540 psi | 67% | 2546 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 37,536 psi | 59% | 2497 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 39,494 psi | 62% | 2536 fps | 95.4% |
| Lovex S070 | <<locked>> | 94% | 45,005 psi | 71% | 2661 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 41,466 psi | 65% | 2562 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 41,539 psi | 65% | 2569 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,376 psi | 59% | 2526 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 35,230 psi | 55% | 2523 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 36,738 psi | 58% | 2536 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 41,814 psi | 66% | 2667 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 44,121 psi | 69% | 2615 fps | 96.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,555 psi | 68% | 2638 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,848 psi | 75% | 2661 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,426 psi | 41% | 1552 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,530 psi | 78% | 2694 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,394 psi | 65% | 2572 fps | 95.1% |
| ReloadSwiss RS 52 | 69.8 gr | 80% | 39,494 psi | 62% | 2635 fps | 97.7% |
| ReloadSwiss RS 60 | 70.9 gr | 80% | 32,430 psi | 51% | 2503 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 36,956 psi | 58% | 2592 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,001 psi | 63% | 2654 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 45,208 psi | 71% | 2602 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,392 psi | 62% | 2513 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 32,750 psi | 51% | 2425 fps | 97% |
| Rottweil R 907 | <<locked>> | 92% | 46,296 psi | 73% | 2651 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,494 psi | 62% | 2536 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,060 psi | 64% | 2585 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,536 psi | 59% | 2497 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 94% | 45,005 psi | 71% | 2661 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,373 psi | 82% | 2710 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,692 psi | 53% | 2470 fps | 96.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,359 psi | 82% | 2690 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,250 psi | 66% | 2585 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,669 psi | 64% | 2572 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,757 psi | 67% | 2516 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,404 psi | 55% | 2385 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,237 psi | 69% | 2579 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 47,761 psi | 75% | 2694 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,496 psi | 67% | 2523 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,076 psi | 66% | 2589 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 33,794 psi | 53% | 2434 fps | 97.1% |
| Somchem S365 | <<locked>> | 84% | 27,673 psi | 43% | 2365 fps | 96% |
| Vihtavuori N130 | <<locked>> | 80% | 48,341 psi | 76% | 2575 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,018 psi | 67% | 2510 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,580 psi | 60% | 2497 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,363 psi | 62% | 2507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,010 psi | 50% | 2372 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 86% | 34,577 psi | 54% | 2474 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,338 psi | 69% | 2612 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 37,884 psi | 59% | 2497 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 36,187 psi | 57% | 2526 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 32,140 psi | 50% | 2503 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,501 psi | 48% | 2346 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 43,685 psi | 68% | 2654 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 43,018 psi | 67% | 2684 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,342 psi | 48% | 2500 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,030 psi | 63% | 2575 fps | 98.7% |
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 118 powders for 9.5 x 66 SE v. Hofe loaded with the .375 | 250gr | Speer TBBC. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,696 fps to 2,979 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for 9.5 x 66 SE v. Hofe with the .375 | 250gr | Speer TBBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.