Load Specifications
Load data in caliber .375 Chey Tac with .375 | 270gr | Barnes X S bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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: 29"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 56,043 psi | 88% | 2940 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 46,499 psi | 73% | 2887 fps | 96.6% |
| Accurate MAGPRO | <<locked>> | 84% | 54,346 psi | 85% | 3048 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 84% | 55,927 psi | 88% | 3018 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,549 psi | 85% | 3035 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 57,130 psi | 90% | 3064 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,740 psi | 90% | 3196 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 98% | 56,304 psi | 88% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,767 psi | 87% | 3009 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,419 psi | 87% | 3035 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,203 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,392 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,186 psi | 85% | 3031 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,782 psi | 87% | 3114 fps | 99% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,202 psi | 88% | 3114 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,810 psi | 86% | 2986 fps | 98.7% |
| Bofors RP15 | <<locked>> | 88% | 54,810 psi | 86% | 3025 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,580 psi | 90% | 3091 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,419 psi | 87% | 3035 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,781 psi | 86% | 3028 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,363 psi | 90% | 3022 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,362 psi | 88% | 3005 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,550 psi | 89% | 2917 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,362 psi | 88% | 3156 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,927 psi | 59% | 1936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,508 psi | 90% | 2995 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 88% | 56,681 psi | 89% | 3074 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 92% | 56,144 psi | 88% | 2933 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,622 psi | 87% | 3077 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 54,520 psi | 85% | 2917 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3100 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,492 psi | 87% | 3051 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,085 psi | 85% | 3038 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 56,869 psi | 89% | 3022 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,015 psi | 61% | 1982 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,392 psi | 90% | 3143 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,203 psi | 90% | 3120 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 84% | 56,521 psi | 89% | 2982 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 55,767 psi | 87% | 3002 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 48,689 psi | 76% | 2907 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,376 psi | 87% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,607 psi | 86% | 2920 fps | 99.7% |
| Somchem S385 | <<locked>> | 84% | 56,260 psi | 88% | 2969 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,014 psi | 88% | 2953 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,564 psi | 87% | 2982 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 84% | 55,956 psi | 88% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,766 psi | 86% | 3051 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 56,289 psi | 88% | 3051 fps | 100% |
| Vihtavuori N568 | <<locked>> | 94% | 57,493 psi | 90% | 3117 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 94% | 54,781 psi | 86% | 3123 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,624 psi | 90% | 3091 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,767 psi | 87% | 2963 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% | 46,383 psi | 73% | 2792 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 43,439 psi | 68% | 2828 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 47,427 psi | 74% | 2927 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 80% | 49,226 psi | 77% | 2910 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 44,628 psi | 70% | 2864 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 33,968 psi | 53% | 2618 fps | 96.5% |
| ADI AR 2218 | <<locked>> | 90% | 40,915 psi | 64% | 2858 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 31,575 psi | 49% | 2605 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,226 psi | 77% | 2904 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,716 psi | 72% | 2874 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,512 psi | 70% | 2802 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,783 psi | 61% | 2759 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,531 psi | 79% | 2979 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 41,959 psi | 66% | 2864 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 92% | 42,453 psi | 67% | 2864 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,946 psi | 67% | 2766 fps | 96.1% |
| Bofors RP15 | <<locked>> | 80% | 42,612 psi | 67% | 2812 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 36,637 psi | 57% | 2707 fps | 97.7% |
| Bofors RP5 | <<locked>> | 80% | 45,716 psi | 72% | 2874 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 36,695 psi | 57% | 2687 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 80% | 47,152 psi | 74% | 2851 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,427 psi | 73% | 2838 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,156 psi | 83% | 2871 fps | 100% |
| Hodgdon Retumbo | 116.5 gr | 80% | 37,913 psi | 59% | 2812 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,631 psi | 45% | 1739 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,979 psi | 75% | 2838 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 80% | 43,453 psi | 68% | 2848 fps | 98.8% |
| IMR 7977 Enduron | <<locked>> | 90% | 52,837 psi | 83% | 2881 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 82% | 31,241 psi | 49% | 2589 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 40,393 psi | 63% | 2680 fps | 100% |
| Norma 217 | <<locked>> | 80% | 29,617 psi | 46% | 2562 fps | 97.2% |
| Norma MRP | <<locked>> | 80% | 48,443 psi | 76% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,700 psi | 68% | 2861 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 39,842 psi | 62% | 2743 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1778 fps | 100% |
| ReloadSwiss RS 76 | 124.7 gr | 80% | 37,420 psi | 59% | 2789 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 34,650 psi | 54% | 2687 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 49,995 psi | 78% | 2877 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 49,037 psi | 77% | 2894 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 42,757 psi | 67% | 2795 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,689 psi | 76% | 2890 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 51,184 psi | 80% | 2864 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 49,734 psi | 78% | 2867 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,569 psi | 68% | 2749 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 45,788 psi | 72% | 2808 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,472 psi | 78% | 2877 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,892 psi | 75% | 2936 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 40,857 psi | 64% | 2776 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 35,781 psi | 56% | 2703 fps | 95.2% |
| Vihtavuori N570 | 130 gr | 86% | 41,655 psi | 65% | 2874 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,134 psi | 68% | 2881 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,847 psi | 72% | 2805 fps | 99.7% |
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 58 powders for .375 Chey Tac loaded with the .375 | 270gr | Barnes X S. ADI AR 2218 delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,196 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 270.0 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, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .375 Chey Tac with the .375 | 270gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Vihtavuori 20N29, Vihtavuori 24N41 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.