Load Specifications
Bullet:.375 | 250gr | Speer TBBC
Bullet Manufacturer:Speer
Bullet Weight:250 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:37XC load data
Case Length (l3):3.087"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:139.8 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:30"
Max. allowed Pressure:69,618 psi
Recommended Twist Rate:1:6.0
Load data in caliber 37XC with .375 | 250gr | Speer TBBC bullet and 120 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Hodgdon H414.
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: 30"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 60,916 psi | 88% | 2992 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 62,149 psi | 89% | 3087 fps | 99.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,869 psi | 82% | 3084 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 61,163 psi | 88% | 3051 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 62,961 psi | 90% | 3186 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 59,335 psi | 85% | 3255 fps | 98.5% |
| ADI APS 450 | <<locked>> | 84% | 62,598 psi | 90% | 2402 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 59,669 psi | 86% | 3094 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 60,872 psi | 87% | 3097 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 59,727 psi | 86% | 3189 fps | 99.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,435 psi | 83% | 3192 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,883 psi | 53% | 2841 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 61,844 psi | 89% | 3077 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 61,380 psi | 88% | 3241 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 62,018 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 62,366 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 59,306 psi | 85% | 3189 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 61,264 psi | 88% | 3215 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 62,859 psi | 90% | 3232 fps | 99.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,565 psi | 81% | 3189 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,359 psi | 77% | 3100 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,354 psi | 67% | 3045 fps | 100% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 62,410 psi | 90% | 3317 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 59,915 psi | 86% | 3114 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 56,391 psi | 81% | 3084 fps | 95.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,779 psi | 74% | 3110 fps | 99% |
| Bofors RP3 | <<locked>> | 86% | 59,567 psi | 86% | 3087 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,221 psi | 61% | 2963 fps | 96.7% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,565 psi | 81% | 3189 fps | 99.6% |
| Bofors RP7 | <<locked>> | 92% | 62,294 psi | 89% | 3133 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 82% | 62,845 psi | 90% | 3048 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 62,555 psi | 90% | 3114 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,934 psi | 66% | 2976 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 86% | 59,727 psi | 86% | 3110 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 60,988 psi | 88% | 3192 fps | 100% |
| Hodgdon H4350 | <<locked>> | 90% | 60,321 psi | 87% | 3150 fps | 99.8% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 61,598 psi | 88% | 3186 fps | 98.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 60,350 psi | 87% | 3169 fps | 98.7% |
| Hodgdon H4895 | <<locked>> | 82% | 60,350 psi | 87% | 3100 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 59,683 psi | 86% | 3097 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 61,293 psi | 88% | 3140 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,339 psi | 65% | 3091 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 92% | 62,105 psi | 89% | 3241 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 52% | 1906 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 61,496 psi | 88% | 3100 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 61,293 psi | 88% | 3064 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 60,394 psi | 87% | 3077 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 59,292 psi | 85% | 3068 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 59,770 psi | 86% | 3117 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 60,089 psi | 86% | 3107 fps | 100% |
| IMR 4831 | <<locked>> | 96% | 62,975 psi | 90% | 3169 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 60,046 psi | 86% | 3123 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 62,627 psi | 90% | 3166 fps | 99% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,723 psi | 79% | 3163 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 82% | 61,844 psi | 89% | 3077 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 60,655 psi | 87% | 3058 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 61,728 psi | 89% | 3054 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 60,655 psi | 87% | 3064 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 60,452 psi | 87% | 3100 fps | 100% |
| Lovex S070 | <<locked>> | 94% | 62,062 psi | 89% | 3150 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,195 psi | 68% | 2940 fps | 99.7% |
| Norma 201 | <<locked>> | 84% | 61,975 psi | 89% | 3077 fps | 100% |
| Norma 202 | <<locked>> | 84% | 62,801 psi | 90% | 3064 fps | 100% |
| Norma 203B | <<locked>> | 86% | 61,569 psi | 88% | 3130 fps | 100% |
| Norma 204 | <<locked>> | 94% | 61,163 psi | 88% | 3182 fps | 99.7% |
| Norma MRPᴾ | <<locked>> | 100% | 60,394 psi | 87% | 3274 fps | 100% |
| Norma URP | <<locked>> | 94% | 61,032 psi | 88% | 3169 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 62,990 psi | 90% | 3159 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,303 psi | 79% | 3179 fps | 99% |
| Ramshot Hunter | <<locked>> | 94% | 59,959 psi | 86% | 3179 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,559 psi | 71% | 3048 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 62,294 psi | 89% | 3123 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 82% | 62,555 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,173 psi | 53% | 1949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 59,495 psi | 85% | 3094 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 60,031 psi | 86% | 3173 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 60,669 psi | 87% | 3202 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 62,990 psi | 90% | 3212 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 61,453 psi | 88% | 3251 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,469 psi | 65% | 3084 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 62,497 psi | 90% | 3041 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 62,584 psi | 90% | 3074 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 59,567 psi | 86% | 3081 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 61,264 psi | 88% | 3153 fps | 99.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 62,236 psi | 89% | 3219 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 92% | 62,294 psi | 89% | 3133 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 92% | 60,452 psi | 87% | 3100 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 60,655 psi | 87% | 3058 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 60,655 psi | 87% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 62,062 psi | 89% | 3150 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 61,366 psi | 88% | 3146 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 61,351 psi | 88% | 3100 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 61,931 psi | 89% | 3110 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 62,642 psi | 90% | 2989 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 60,046 psi | 86% | 2943 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 60,292 psi | 87% | 3051 fps | 100% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 61,714 psi | 89% | 3212 fps | 99.8% |
| Somchem S335 | <<locked>> | 84% | 62,236 psi | 89% | 2986 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 60,916 psi | 88% | 3077 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 59,277 psi | 85% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 59,553 psi | 86% | 3087 fps | 98.5% |
| Somchem S365 | <<locked>> | 96% | 60,742 psi | 87% | 3163 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 58,885 psi | 85% | 3130 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 82% | 59,393 psi | 85% | 2920 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 59,538 psi | 86% | 2972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 59,640 psi | 86% | 2992 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 60,713 psi | 87% | 3041 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 59,480 psi | 85% | 3107 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,549 psi | 78% | 3048 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 62,526 psi | 90% | 3077 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 61,641 psi | 89% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 62,395 psi | 90% | 3166 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 59,727 psi | 86% | 3179 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 60,466 psi | 87% | 3268 fps | 99% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,225 psi | 69% | 3048 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 59,321 psi | 85% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 61,119 psi | 88% | 3196 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,921 psi | 70% | 3179 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 62,453 psi | 90% | 3120 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 59,335 psi | 85% | 3127 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 30"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 53,461 psi | 77% | 2897 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,966 psi | 73% | 2920 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 28,660 psi | 41% | 2526 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 50,691 psi | 73% | 2910 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,899 psi | 56% | 2799 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 44,570 psi | 64% | 2999 fps | 95.4% |
| ADI APS 450 | <<locked>> | 80% | 58,537 psi | 84% | 2343 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 56,014 psi | 80% | 3041 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 47,572 psi | 68% | 2894 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 37,681 psi | 54% | 2782 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 41,002 psi | 59% | 2884 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 32,489 psi | 47% | 2717 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 58,088 psi | 83% | 3028 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,127 psi | 76% | 3127 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,269 psi | 69% | 2917 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,503 psi | 74% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,695 psi | 54% | 2808 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,989 psi | 62% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,463 psi | 54% | 2776 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 86% | 35,317 psi | 51% | 2769 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,746 psi | 40% | 2566 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 27,804 psi | 40% | 2572 fps | 95.1% |
| Alliant Reloder-26 | 98.5 gr | 80% | 29,762 psi | 43% | 2687 fps | 97.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 56,130 psi | 81% | 3061 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 52,982 psi | 76% | 3028 fps | 95.1% |
| Bofors RP15 | <<locked>> | 90% | 37,275 psi | 54% | 2818 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 48,747 psi | 70% | 2930 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,465 psi | 57% | 2904 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 35,317 psi | 51% | 2769 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,699 psi | 61% | 2808 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 80% | 59,059 psi | 85% | 2999 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 58,537 psi | 84% | 3064 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 40,147 psi | 58% | 2851 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 49,066 psi | 70% | 2949 fps | 100% |
| Hodgdon H414 | 94 gr | 80% | 40,814 psi | 59% | 2848 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 43,671 psi | 63% | 2864 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 43,845 psi | 63% | 2890 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 43,004 psi | 62% | 2871 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 56,652 psi | 81% | 3048 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,273 psi | 51% | 2694 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,592 psi | 77% | 3035 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 34,983 psi | 50% | 2828 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 39,885 psi | 57% | 2864 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 39% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,143 psi | 78% | 2995 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 57,508 psi | 83% | 3015 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,053 psi | 72% | 2927 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,301 psi | 75% | 2959 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 38,348 psi | 55% | 2736 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,106 psi | 63% | 2838 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 37,318 psi | 54% | 2749 fps | 99.3% |
| IMR 4895 | <<locked>> | 80% | 52,823 psi | 76% | 3018 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 42,917 psi | 62% | 2831 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 41,814 psi | 60% | 2913 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 58,088 psi | 83% | 3028 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 56,724 psi | 81% | 3005 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 54,621 psi | 78% | 2956 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,357 psi | 72% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,655 psi | 60% | 2789 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 39,929 psi | 57% | 2772 fps | 98.1% |
| Lovex S071 | <<locked>> | 86% | 29,965 psi | 43% | 2566 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 54,752 psi | 79% | 2979 fps | 100% |
| Norma 202 | <<locked>> | 80% | 55,448 psi | 80% | 2969 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,836 psi | 73% | 2976 fps | 100% |
| Norma 204 | <<locked>> | 80% | 37,855 psi | 54% | 2766 fps | 95.5% |
| Norma MRP | <<locked>> | 82% | 32,155 psi | 46% | 2717 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 38,580 psi | 55% | 2792 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 80% | 51,430 psi | 74% | 2999 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,495 psi | 60% | 2920 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 37,449 psi | 54% | 2782 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 90% | 34,403 psi | 49% | 2730 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 58,320 psi | 84% | 3068 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 80% | 58,610 psi | 84% | 3077 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,847 psi | 40% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,994 psi | 70% | 2930 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 55,999 psi | 80% | 3114 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,643 psi | 66% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,740 psi | 56% | 2818 fps | 99.4% |
| ReloadSwiss RS 70 | 97.6 gr | 80% | 37,507 psi | 54% | 2831 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 32,039 psi | 46% | 2740 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 58,856 psi | 85% | 2995 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 52,141 psi | 75% | 2930 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,876 psi | 66% | 2877 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 41,742 psi | 60% | 2815 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 36,535 psi | 52% | 2756 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,699 psi | 61% | 2808 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,655 psi | 60% | 2789 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 56,724 psi | 81% | 3005 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 50,357 psi | 72% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,929 psi | 57% | 2772 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,079 psi | 68% | 2933 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 57,363 psi | 82% | 3048 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,549 psi | 78% | 3009 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 55,303 psi | 79% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,905 psi | 67% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,799 psi | 59% | 2730 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,187 psi | 52% | 2753 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 55,143 psi | 79% | 2897 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 57,058 psi | 82% | 3025 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 46,064 psi | 66% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 42,670 psi | 61% | 2802 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 35,085 psi | 50% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 34,780 psi | 50% | 2684 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 55,898 psi | 80% | 2874 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 52,460 psi | 75% | 2881 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,620 psi | 76% | 2900 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,063 psi | 63% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,016 psi | 57% | 2785 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 34,301 psi | 49% | 2661 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 58,624 psi | 84% | 3025 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 50,952 psi | 73% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,479 psi | 57% | 2792 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 30,705 psi | 44% | 2641 fps | 98.3% |
| Vihtavuori N560 | <<locked>> | 90% | 42,743 psi | 61% | 2953 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 42,003 psi | 60% | 2930 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,160 psi | 56% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 40,930 psi | 59% | 2851 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,555 psi | 35% | 2552 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,723 psi | 79% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,405 psi | 52% | 2717 fps | 95.3% |
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 125 powders for 37XC loaded with the .375 | 250gr | Speer TBBC. Alliant Reloder-26 delivers the highest muzzle velocity at 3,317 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,317 fps. Accurate 3100 gives the best case fill at 100 %, and 125 of the 125 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. Alliant Reloder-26, ReloadSwiss RS 70, Hodgdon H414 rank at the top here: for 37XC with the .375 | 250gr | Speer TBBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, ReloadSwiss RS 80, Vihtavuori N568 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.