Load Specifications
Load data in caliber .375 Chey Tac with .376 | 250gr | Peregrine Glider GRM bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Ramshot Grand.
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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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>> | 92% | 55,985 psi | 88% | 3048 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,695 psi | 89% | 3081 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,985 psi | 88% | 3169 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 54,186 psi | 85% | 3094 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 56,101 psi | 88% | 3166 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 3120 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,660 psi | 76% | 3084 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,172 psi | 85% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,522 psi | 90% | 3140 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,246 psi | 88% | 3156 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,638 psi | 90% | 3110 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,595 psi | 90% | 3182 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,317 psi | 85% | 3153 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,329 psi | 80% | 3143 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,377 psi | 90% | 3117 fps | 98.4% |
| Bofors RP15 | <<locked>> | 94% | 55,288 psi | 87% | 3140 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3196 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 56,246 psi | 88% | 3156 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 54,766 psi | 86% | 3028 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3146 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 55,680 psi | 87% | 3081 fps | 100% |
| Hodgdon H4831 | <<locked>> | 94% | 55,129 psi | 86% | 3087 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,447 psi | 85% | 3077 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,317 psi | 85% | 3002 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,434 psi | 88% | 3274 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,390 psi | 87% | 3120 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1985 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,696 psi | 90% | 3054 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,942 psi | 89% | 3071 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,333 psi | 88% | 3054 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 54,839 psi | 86% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,362 psi | 88% | 3074 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 54,157 psi | 85% | 3143 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,961 psi | 69% | 2989 fps | 98.7% |
| Lovex S065 | <<locked>> | 84% | 57,043 psi | 89% | 3045 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,376 psi | 87% | 3048 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,276 psi | 90% | 3064 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,404 psi | 85% | 3077 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 44,353 psi | 70% | 3012 fps | 99.9% |
| Norma MRP | <<locked>> | 90% | 56,173 psi | 88% | 3173 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,100 psi | 86% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 53,882 psi | 84% | 3143 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 54,128 psi | 85% | 3074 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,434 psi | 87% | 3110 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 60% | 2031 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,043 psi | 89% | 3104 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,622 psi | 87% | 3136 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 53,432 psi | 84% | 3199 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,014 psi | 89% | 3222 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 88% | 55,056 psi | 86% | 3061 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 90% | 57,014 psi | 89% | 3130 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 54,766 psi | 86% | 3028 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,043 psi | 89% | 3045 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,376 psi | 87% | 3048 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,217 psi | 88% | 2999 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,579 psi | 89% | 3123 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,782 psi | 89% | 3048 fps | 99.4% |
| Somchem S365 | <<locked>> | 86% | 55,985 psi | 88% | 3064 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,377 psi | 90% | 3094 fps | 100% |
| Unknown powder | <<locked>> | 82% | 55,158 psi | 86% | 3068 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,101 psi | 89% | 2979 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,811 psi | 89% | 3051 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,348 psi | 90% | 3071 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 56,289 psi | 88% | 3084 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,985 psi | 88% | 3058 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,767 psi | 87% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,825 psi | 87% | 3176 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 96% | 56,159 psi | 88% | 3156 fps | 99.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,609 psi | 90% | 3222 fps | 99.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 3219 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,594 psi | 89% | 2999 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,681 psi | 89% | 3202 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,114 psi | 86% | 3054 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% | 36,695 psi | 57% | 2713 fps | 99.2% |
| Accurate 4350 | <<locked>> | 80% | 49,240 psi | 77% | 2969 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 41,713 psi | 65% | 2907 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 41,046 psi | 64% | 2858 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 36,579 psi | 57% | 2782 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 35,563 psi | 56% | 2749 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 84% | 28,021 psi | 44% | 2582 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,195 psi | 74% | 2982 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,104 psi | 64% | 2851 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,883 psi | 58% | 2792 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,447 psi | 56% | 2746 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,676 psi | 48% | 2661 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,653 psi | 62% | 2900 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 43,888 psi | 69% | 2999 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 44,411 psi | 70% | 2881 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 34,156 psi | 54% | 2723 fps | 96.3% |
| Bofors RP30 | <<locked>> | 86% | 34,795 psi | 55% | 2766 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 36,883 psi | 58% | 2792 fps | 97.4% |
| Bofors RP7 | <<locked>> | 80% | 51,372 psi | 81% | 2976 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 86% | 34,142 psi | 54% | 2717 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 48,907 psi | 77% | 2969 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 36,767 psi | 58% | 2736 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,406 psi | 60% | 2772 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,382 psi | 70% | 2851 fps | 100% |
| Hodgdon Retumbo | 112.6 gr | 80% | 29,878 psi | 47% | 2680 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 51,300 psi | 80% | 3058 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1778 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,201 psi | 85% | 2999 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,891 psi | 73% | 2907 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,808 psi | 83% | 2999 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 42,250 psi | 66% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,683 psi | 64% | 2789 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 37,550 psi | 59% | 2818 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 92% | 33,199 psi | 52% | 2740 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 50,183 psi | 79% | 2943 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,559 psi | 76% | 2940 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 31,343 psi | 49% | 2585 fps | 97.9% |
| Norma 204 | <<locked>> | 80% | 47,253 psi | 74% | 2956 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 28,819 psi | 45% | 2638 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 38,841 psi | 61% | 2864 fps | 99% |
| Norma URP | <<locked>> | 80% | 48,095 psi | 75% | 2956 fps | 100% |
| Ramshot Grand | 120.5 gr | 80% | 39,247 psi | 62% | 2867 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 47,123 psi | 74% | 2959 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,127 psi | 53% | 2717 fps | 97.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,427 psi | 45% | 1824 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,458 psi | 78% | 2992 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,950 psi | 75% | 3022 fps | 100% |
| ReloadSwiss RS 76 | 120.5 gr | 80% | 29,008 psi | 45% | 2648 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 38,203 psi | 60% | 2874 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 42,250 psi | 66% | 2831 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 40,350 psi | 63% | 2835 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 80% | 51,372 psi | 81% | 2976 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,183 psi | 79% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,559 psi | 76% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,197 psi | 77% | 2890 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,016 psi | 63% | 2828 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 43,134 psi | 68% | 2815 fps | 97.2% |
| Somchem S365 | <<locked>> | 80% | 45,426 psi | 71% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,872 psi | 64% | 2812 fps | 99% |
| Unknown powder | <<locked>> | 80% | 51,561 psi | 81% | 3012 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 53,417 psi | 84% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,676 psi | 78% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,462 psi | 56% | 2680 fps | 97.4% |
| Vihtavuori N170 | <<locked>> | 96% | 52,475 psi | 82% | 3025 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 48,979 psi | 77% | 2953 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,668 psi | 62% | 2822 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 38,885 psi | 61% | 2854 fps | 96.2% |
| Vihtavuori N565 | <<locked>> | 84% | 36,695 psi | 57% | 2785 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 90% | 39,595 psi | 62% | 2894 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 96% | 46,833 psi | 73% | 3081 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,110 psi | 77% | 2897 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,111 psi | 50% | 2782 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,915 psi | 64% | 2808 fps | 98.4% |
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 79 powders for .375 Chey Tac loaded with the .376 | 250gr | Peregrine Glider GRM. Hodgdon Retumbo delivers the highest muzzle velocity at 3,274 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,274 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.376" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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. Hodgdon Retumbo, ReloadSwiss RS 76, Ramshot Grand rank at the top here: for .375 Chey Tac with the .376 | 250gr | Peregrine Glider GRM they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, IMR 7977 Enduron, Lovex D100 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.