Load Specifications
Load data in caliber .375 Chey Tac with .375 | 350gr | North Fork Semi Spitz bullet and 56 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Ramshot LRT and Hodgdon Retumbo.
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.
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Max Load - Barrel Length: 29"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 56,086 psi | 88% | 2628 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,358 psi | 80% | 2697 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 82% | 55,216 psi | 87% | 2749 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 56,913 psi | 89% | 2710 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,680 psi | 87% | 2736 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,158 psi | 86% | 2723 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,448 psi | 87% | 2864 fps | 100% |
| ADI AR 2225 | <<locked>> | 94% | 54,839 psi | 86% | 2746 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,058 psi | 89% | 2707 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,492 psi | 89% | 2700 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,231 psi | 88% | 2726 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,708 psi | 86% | 2631 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,477 psi | 87% | 2710 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,624 psi | 90% | 2838 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,740 psi | 90% | 2838 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,753 psi | 87% | 2703 fps | 99.9% |
| Bofors RP15 | <<locked>> | 86% | 55,869 psi | 88% | 2723 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,259 psi | 87% | 2743 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,231 psi | 88% | 2726 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,478 psi | 89% | 2736 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,375 psi | 85% | 2671 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,029 psi | 89% | 2707 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,085 psi | 86% | 2805 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,116 psi | 60% | 1706 fps | 100% |
| Hodgdon US 869ᴾ | <<locked>> | 100% | 56,231 psi | 88% | 2756 fps | 97.3% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,563 psi | 86% | 2648 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 54,447 psi | 85% | 2723 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,666 psi | 89% | 2664 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,595 psi | 90% | 2789 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 53,896 psi | 84% | 2664 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 54,636 psi | 86% | 2608 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,317 psi | 87% | 2756 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,579 psi | 89% | 2740 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,753 psi | 87% | 2743 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 55,056 psi | 86% | 2795 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 86% | 54,186 psi | 85% | 2674 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,160 psi | 61% | 1749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,593 psi | 87% | 2789 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,752 psi | 86% | 2776 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 57,101 psi | 89% | 2680 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,376 psi | 88% | 2694 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 53,896 psi | 84% | 2664 fps | 97.2% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,301 psi | 84% | 2703 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,014 psi | 88% | 2690 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,565 psi | 89% | 2661 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 46,659 psi | 73% | 2625 fps | 97.3% |
| Vihtavuori 24N41 | <<locked>> | 98% | 57,145 psi | 90% | 2766 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 86% | 56,768 psi | 89% | 2651 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,941 psi | 88% | 2703 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 82% | 56,478 psi | 89% | 2654 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,854 psi | 88% | 2756 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 57,246 psi | 90% | 2753 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,216 psi | 87% | 2776 fps | 100% |
| Vihtavuori N570 | <<locked>> | 92% | 56,681 psi | 89% | 2844 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,695 psi | 87% | 2723 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,289 psi | 88% | 2661 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 29"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 49,095 psi | 77% | 2536 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 35,737 psi | 56% | 2415 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 80% | 51,401 psi | 81% | 2694 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 53,200 psi | 83% | 2661 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,501 psi | 76% | 2631 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 36,347 psi | 57% | 2418 fps | 99.4% |
| ADI AR 2218 | 121.2 gr | 82% | 33,359 psi | 52% | 2428 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 33,663 psi | 53% | 2402 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,447 psi | 84% | 2657 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,953 psi | 83% | 2651 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,269 psi | 77% | 2628 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,051 psi | 75% | 2543 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,221 psi | 66% | 2520 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 34,243 psi | 54% | 2425 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 84% | 34,534 psi | 54% | 2428 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,992 psi | 72% | 2552 fps | 99% |
| Bofors RP15 | <<locked>> | 80% | 45,919 psi | 72% | 2575 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 39,436 psi | 62% | 2487 fps | 99.8% |
| Bofors RP5 | <<locked>> | 80% | 49,269 psi | 77% | 2628 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,595 psi | 62% | 2480 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 50,894 psi | 80% | 2621 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,922 psi | 78% | 2605 fps | 100% |
| Hodgdon Retumbo | 111.6 gr | 80% | 41,350 psi | 65% | 2595 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,631 psi | 45% | 1526 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 48,849 psi | 77% | 2644 fps | 95.7% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,213 psi | 80% | 2598 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 47,413 psi | 74% | 2621 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 43,961 psi | 69% | 2461 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,314 psi | 49% | 2333 fps | 98.2% |
| Lovex D100 | <<locked>> | 88% | 46,789 psi | 73% | 2552 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 42,482 psi | 67% | 2434 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,749 psi | 50% | 2359 fps | 99.7% |
| Norma MRP | <<locked>> | 80% | 52,765 psi | 83% | 2690 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,182 psi | 76% | 2635 fps | 100% |
| Ramshot LRT | 135.7 gr | 92% | 47,805 psi | 75% | 2677 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 80% | 43,439 psi | 68% | 2523 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,428 psi | 46% | 1565 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,973 psi | 64% | 2575 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,637 psi | 59% | 2490 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 80% | 53,635 psi | 84% | 2631 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 52,852 psi | 83% | 2644 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 88% | 46,789 psi | 73% | 2552 fps | 95.5% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 35,389 psi | 55% | 2385 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,504 psi | 82% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,040 psi | 83% | 2612 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 96% | 40,466 psi | 63% | 2513 fps | 95.5% |
| Vihtavuori 24N41 | <<locked>> | 94% | 49,516 psi | 78% | 2651 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 80% | 46,630 psi | 73% | 2513 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 40,132 psi | 63% | 2438 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 80% | 53,011 psi | 83% | 2612 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,141 psi | 82% | 2700 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 43,656 psi | 68% | 2549 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 38,783 psi | 61% | 2500 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 80% | 36,956 psi | 58% | 2497 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,979 psi | 75% | 2625 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,226 psi | 77% | 2566 fps | 100% |
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 56 powders for .375 Chey Tac loaded with the .375 | 350gr | North Fork Semi Spitz. ADI AR 2218 delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,864 fps. Accurate 8700 gives the best case fill at 100 %, and 56 of the 56 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 350.0 gr projectile in 0.375" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. ADI AR 2218, Ramshot LRT, Hodgdon Retumbo rank at the top here: for .375 Chey Tac with the .375 | 350gr | North Fork Semi Spitz 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.