Load Specifications
Load data in caliber .375 Chey Tac with .375 | 305gr | Hammer Claw Hammer bullet and 56 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Alliant Reloder-33 and ADI AR 2218.
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>> | 86% | 54,418 psi | 85% | 2776 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 45,237 psi | 71% | 2749 fps | 97.4% |
| Accurate MAGPRO | <<locked>> | 86% | 57,217 psi | 90% | 2949 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 55,564 psi | 87% | 2867 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 53,983 psi | 85% | 2884 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 56,652 psi | 89% | 2917 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 3054 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 98% | 55,637 psi | 87% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,143 psi | 86% | 2854 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,563 psi | 86% | 2881 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,391 psi | 88% | 2831 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,826 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,174 psi | 90% | 2923 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,795 psi | 86% | 2966 fps | 99.4% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 2959 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,607 psi | 86% | 2848 fps | 99.3% |
| Bofors RP15 | <<locked>> | 90% | 57,566 psi | 90% | 2920 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,652 psi | 89% | 2933 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 54,563 psi | 86% | 2881 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,331 psi | 85% | 2881 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 56,826 psi | 89% | 2871 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,753 psi | 87% | 2858 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,898 psi | 88% | 2762 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,014 psi | 88% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,826 psi | 59% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,653 psi | 90% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,159 psi | 90% | 2851 fps | 100% |
| IMR 7828 SSC | <<locked>> | 88% | 56,246 psi | 88% | 2923 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 92% | 55,666 psi | 87% | 2799 fps | 96.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,636 psi | 86% | 2927 fps | 100% |
| Lovex D100 | <<locked>> | 96% | 56,173 psi | 88% | 2844 fps | 96.1% |
| Lovex S071 | <<locked>> | 92% | 56,304 psi | 88% | 2802 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,898 psi | 88% | 2943 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,578 psi | 86% | 2894 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,711 psi | 90% | 2943 fps | 100% |
| Ramshot LRTᴾ | <<locked>> | 100% | 56,797 psi | 89% | 2976 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 90% | 56,115 psi | 88% | 2871 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,798 psi | 61% | 1860 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,985 psi | 89% | 2989 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,173 psi | 88% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 56,086 psi | 88% | 2835 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 54,926 psi | 86% | 2848 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 96% | 56,173 psi | 88% | 2844 fps | 96.1% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 47,427 psi | 74% | 2762 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,549 psi | 85% | 2844 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,479 psi | 90% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 55,288 psi | 87% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,245 psi | 87% | 2802 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,404 psi | 85% | 2835 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 84% | 54,650 psi | 86% | 2812 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,012 psi | 85% | 2900 fps | 100% |
| Vihtavuori N565 | <<locked>> | 90% | 55,085 psi | 86% | 2894 fps | 100% |
| Vihtavuori N568 | <<locked>> | 94% | 56,681 psi | 89% | 2969 fps | 100% |
| Vihtavuori N570 | <<locked>> | 94% | 54,012 psi | 85% | 2976 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,768 psi | 89% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,085 psi | 86% | 2815 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% | 44,483 psi | 70% | 2631 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 39,189 psi | 61% | 2628 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 46,311 psi | 73% | 2776 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 80% | 48,530 psi | 76% | 2759 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 43,743 psi | 69% | 2713 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 80% | 32,648 psi | 51% | 2474 fps | 97.2% |
| ADI AR 2218 | 133.9 gr | 90% | 39,682 psi | 62% | 2720 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 29,994 psi | 47% | 2451 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,399 psi | 76% | 2753 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,512 psi | 70% | 2720 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,337 psi | 68% | 2644 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,550 psi | 59% | 2605 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,284 psi | 77% | 2815 fps | 100% |
| Alliant Reloder-33 | 130.3 gr | 86% | 37,666 psi | 59% | 2651 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 90% | 37,449 psi | 59% | 2641 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,177 psi | 66% | 2628 fps | 97% |
| Bofors RP15 | <<locked>> | 80% | 41,481 psi | 65% | 2661 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 35,056 psi | 55% | 2549 fps | 98.1% |
| Bofors RP5 | <<locked>> | 80% | 44,512 psi | 70% | 2720 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 35,491 psi | 56% | 2546 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 80% | 46,369 psi | 73% | 2710 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,484 psi | 71% | 2694 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,373 psi | 82% | 2717 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 36,666 psi | 57% | 2661 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1627 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,085 psi | 85% | 2782 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,195 psi | 74% | 2694 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 42,554 psi | 67% | 2700 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 88% | 48,994 psi | 77% | 2690 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 82% | 29,501 psi | 46% | 2431 fps | 95.9% |
| Lovex D100 | <<locked>> | 94% | 52,286 psi | 82% | 2785 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 38,435 psi | 60% | 2523 fps | 100% |
| Norma 217 | <<locked>> | 80% | 27,717 psi | 43% | 2398 fps | 97.4% |
| Norma MRP | <<locked>> | 80% | 47,442 psi | 74% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,772 psi | 67% | 2713 fps | 99.6% |
| Ramshot LRT | <<locked>> | 98% | 52,837 psi | 83% | 2913 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 80% | 38,537 psi | 60% | 2595 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,153 psi | 46% | 1670 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,984 psi | 56% | 2638 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 32,953 psi | 52% | 2533 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 49,284 psi | 77% | 2733 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 48,124 psi | 75% | 2743 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 52,286 psi | 82% | 2785 fps | 95.2% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 41,263 psi | 65% | 2651 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,776 psi | 75% | 2740 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 50,270 psi | 79% | 2720 fps | 99.7% |
| Somchem S385 | <<locked>> | 80% | 48,443 psi | 76% | 2713 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,395 psi | 66% | 2602 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 41,495 psi | 65% | 2612 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 47,964 psi | 75% | 2717 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,050 psi | 74% | 2789 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 80% | 39,233 psi | 61% | 2618 fps | 98.5% |
| Vihtavuori N568 | <<locked>> | 80% | 34,258 psi | 54% | 2549 fps | 95.9% |
| Vihtavuori N570 | 122.4 gr | 84% | 37,550 psi | 59% | 2661 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,974 psi | 66% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,788 psi | 70% | 2654 fps | 99.9% |
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 60 powders for .375 Chey Tac loaded with the .375 | 305gr | Hammer Claw Hammer . ADI AR 2218 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,054 fps. Accurate 8700 gives the best case fill at 100 %, and 60 of the 60 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 305.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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. Vihtavuori N570, Alliant Reloder-33, ADI AR 2218 rank at the top here: for .375 Chey Tac with the .375 | 305gr | Hammer Claw Hammer they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Hodgdon US 869, Vihtavuori 20N29 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.