Load Specifications
Load data in caliber .375 Chey Tac with .375 | 350gr | Sierra HPBT MatchKinging bullet and 59 powders. The key underlying parameters are shown in the table above.
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% | 54,201 psi | 85% | 2598 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,008 psi | 77% | 2657 fps | 99.1% |
| Accurate High Country | <<locked>> | 82% | 56,057 psi | 88% | 2759 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 56,942 psi | 89% | 2769 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 55,085 psi | 86% | 2680 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,682 psi | 90% | 2756 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 56,826 psi | 89% | 2740 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 57,130 psi | 90% | 2884 fps | 100% |
| ADI AR 2225 | <<locked>> | 96% | 56,217 psi | 88% | 2762 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 55,274 psi | 87% | 2677 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,737 psi | 86% | 2674 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,491 psi | 85% | 2700 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,420 psi | 88% | 2648 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,942 psi | 89% | 2726 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,159 psi | 90% | 2736 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,100 psi | 86% | 2802 fps | 99.9% |
| Alliant Reloder-50 | <<locked>> | 98% | 54,984 psi | 86% | 2799 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,653 psi | 90% | 2723 fps | 99.9% |
| Bofors RP15 | <<locked>> | 88% | 57,522 psi | 90% | 2740 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,826 psi | 89% | 2759 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,491 psi | 85% | 2700 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,360 psi | 85% | 2703 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,347 psi | 88% | 2690 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,376 psi | 87% | 2677 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,492 psi | 89% | 2822 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,043 psi | 60% | 1693 fps | 100% |
| Hodgdon US 869ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 2717 fps | 96.7% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,463 psi | 88% | 2667 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 56,188 psi | 88% | 2743 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,114 psi | 86% | 2631 fps | 97.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,158 psi | 86% | 2756 fps | 100% |
| Lovex D100 | <<locked>> | 94% | 55,753 psi | 87% | 2684 fps | 97.3% |
| Lovex S071 | <<locked>> | 90% | 56,231 psi | 88% | 2625 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,507 psi | 89% | 2769 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,433 psi | 85% | 2710 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,609 psi | 90% | 2762 fps | 100% |
| Ramshot LRT | <<locked>> | 98% | 56,637 psi | 89% | 2815 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 88% | 56,014 psi | 88% | 2694 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,001 psi | 61% | 1732 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,305 psi | 90% | 2808 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,391 psi | 88% | 2795 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 55,506 psi | 87% | 2651 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 54,650 psi | 86% | 2664 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 55,753 psi | 87% | 2684 fps | 97.3% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,981 psi | 80% | 2664 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,288 psi | 85% | 2661 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,666 psi | 89% | 2644 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 54,853 psi | 86% | 2631 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 44,512 psi | 70% | 2585 fps | 96.5% |
| Vihtavuori 24N41 | <<locked>> | 98% | 54,868 psi | 86% | 2726 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 86% | 54,911 psi | 86% | 2621 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,012 psi | 85% | 2667 fps | 99% |
| Vihtavuori N555 | <<locked>> | 82% | 54,636 psi | 86% | 2628 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,638 psi | 90% | 2772 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 55,100 psi | 86% | 2720 fps | 100% |
| Vihtavuori N568 | <<locked>> | 92% | 56,782 psi | 89% | 2792 fps | 100% |
| Vihtavuori N570 | <<locked>> | 92% | 54,375 psi | 85% | 2808 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,261 psi | 90% | 2743 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,563 psi | 86% | 2635 fps | 100% |
Start Load - Barrel Length: 29"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 47,543 psi | 75% | 2510 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 34,185 psi | 54% | 2379 fps | 95.1% |
| Accurate High Country | <<locked>> | 80% | 52,315 psi | 82% | 2707 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 49,559 psi | 78% | 2661 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 80% | 51,648 psi | 81% | 2635 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 46,833 psi | 73% | 2602 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 35,041 psi | 55% | 2385 fps | 99.1% |
| ADI AR 2218 | <<locked>> | 84% | 34,432 psi | 54% | 2451 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 32,314 psi | 51% | 2369 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 51,924 psi | 81% | 2631 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,430 psi | 81% | 2625 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,587 psi | 75% | 2602 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,398 psi | 73% | 2516 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,611 psi | 64% | 2493 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,098 psi | 83% | 2687 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 32,764 psi | 51% | 2388 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 86% | 35,302 psi | 55% | 2448 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,541 psi | 70% | 2523 fps | 98.7% |
| Bofors RP15 | <<locked>> | 80% | 44,367 psi | 70% | 2546 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 37,956 psi | 59% | 2457 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 47,587 psi | 75% | 2602 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 38,101 psi | 60% | 2448 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 49,226 psi | 77% | 2589 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,370 psi | 76% | 2575 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 39,639 psi | 62% | 2562 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,558 psi | 45% | 1516 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 50,212 psi | 79% | 2661 fps | 95.8% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,850 psi | 78% | 2572 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 45,687 psi | 72% | 2589 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 42,583 psi | 67% | 2428 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 29,936 psi | 47% | 2300 fps | 97.6% |
| Lovex D100 | <<locked>> | 90% | 48,370 psi | 76% | 2572 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 41,046 psi | 64% | 2408 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,269 psi | 47% | 2326 fps | 99.4% |
| Norma MRP | <<locked>> | 80% | 50,807 psi | 80% | 2661 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,267 psi | 73% | 2605 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 49,197 psi | 77% | 2697 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 80% | 41,640 psi | 65% | 2490 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1552 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,059 psi | 61% | 2539 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 35,984 psi | 56% | 2454 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 80% | 52,011 psi | 82% | 2602 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 51,140 psi | 80% | 2615 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 48,370 psi | 76% | 2572 fps | 95.7% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 36,260 psi | 57% | 2402 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,792 psi | 80% | 2615 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,127 psi | 83% | 2598 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 51,445 psi | 81% | 2585 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 98% | 41,466 psi | 65% | 2530 fps | 95.6% |
| Vihtavuori 24N41 | <<locked>> | 96% | 51,140 psi | 80% | 2671 fps | 95.9% |
| Vihtavuori N165 | <<locked>> | 80% | 45,223 psi | 71% | 2487 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 38,667 psi | 61% | 2405 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 51,285 psi | 80% | 2585 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,227 psi | 79% | 2667 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 42,134 psi | 66% | 2516 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 37,115 psi | 58% | 2464 fps | 98.2% |
| Vihtavuori N570 | <<locked>> | 80% | 35,244 psi | 55% | 2457 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,905 psi | 72% | 2598 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,601 psi | 75% | 2536 fps | 100% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 59 powders for .375 Chey Tac loaded with the .375 | 350gr | Sierra HPBT MatchKinging. ADI AR 2218 delivers the highest muzzle velocity at 2,884 fps; across all powders the maximum-charge window runs from 1,693 fps to 2,884 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 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 1:13.5 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.