Load Specifications
Load data in caliber .375 Swiss P with .375 | 250gr | Speer TBBC bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 52,373 psi | 86% | 2802 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 53,911 psi | 89% | 2864 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,778 psi | 83% | 2897 fps | 99.1% |
| Accurate 4064 | <<locked>> | 84% | 52,750 psi | 87% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,142 psi | 87% | 2956 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,142 psi | 87% | 2887 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,259 psi | 89% | 2995 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 51,808 psi | 85% | 3002 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,722 psi | 88% | 2910 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,056 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 53,925 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 51,416 psi | 84% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,505 psi | 88% | 2986 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,575 psi | 83% | 2982 fps | 97.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,659 psi | 78% | 2920 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,611 psi | 68% | 2831 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,592 psi | 90% | 3117 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,412 psi | 76% | 2904 fps | 96.2% |
| Bofors RP3 | <<locked>> | 86% | 54,491 psi | 89% | 2927 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,575 psi | 83% | 2982 fps | 97.3% |
| Bofors RP7 | <<locked>> | 90% | 54,085 psi | 89% | 2907 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 54,984 psi | 90% | 2943 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 51,924 psi | 85% | 2953 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 88% | 52,083 psi | 86% | 2913 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,114 psi | 89% | 2936 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 52,446 psi | 86% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 51,793 psi | 85% | 2986 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,216 psi | 59% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,606 psi | 88% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 52,576 psi | 86% | 2867 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 51,953 psi | 85% | 2848 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 54,839 psi | 90% | 2940 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 52,402 psi | 86% | 2884 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 53,650 psi | 88% | 2949 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 51,938 psi | 85% | 2907 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,911 psi | 89% | 2923 fps | 95.9% |
| Lovex S060 | <<locked>> | 82% | 54,404 psi | 89% | 2858 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 52,707 psi | 87% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 52,373 psi | 86% | 2881 fps | 99.4% |
| Lovex S070 | <<locked>> | 92% | 53,403 psi | 88% | 2920 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,134 psi | 69% | 2746 fps | 97.7% |
| Norma 201 | <<locked>> | 82% | 54,056 psi | 89% | 2877 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,723 psi | 90% | 2874 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,345 psi | 88% | 2920 fps | 100% |
| Norma 204 | <<locked>> | 92% | 51,924 psi | 85% | 2933 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 53,534 psi | 88% | 3068 fps | 99% |
| Norma URP | <<locked>> | 92% | 51,982 psi | 85% | 2943 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 53,882 psi | 88% | 2943 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,273 psi | 89% | 2995 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,048 psi | 72% | 2831 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 61% | 1867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,984 psi | 90% | 2927 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,795 psi | 90% | 3002 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,650 psi | 90% | 3035 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 52,895 psi | 87% | 2979 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 51,561 psi | 85% | 3005 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 54,853 psi | 90% | 2877 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,476 psi | 89% | 2923 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 52,591 psi | 86% | 2910 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 98% | 52,605 psi | 86% | 2969 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 54,085 psi | 89% | 2907 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 52,373 psi | 86% | 2881 fps | 99.4% |
| Shooters World Precision | <<locked>> | 84% | 52,707 psi | 87% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,403 psi | 88% | 2920 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 52,562 psi | 86% | 2930 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 53,824 psi | 88% | 2904 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,042 psi | 90% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 52,489 psi | 86% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 52,112 psi | 86% | 2831 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,127 psi | 86% | 2963 fps | 97.5% |
| Somchem S335 | <<locked>> | 82% | 54,621 psi | 90% | 2802 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,563 psi | 90% | 2917 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,462 psi | 89% | 2995 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,272 psi | 87% | 2943 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 84% | 54,969 psi | 90% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 51,982 psi | 85% | 2805 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 52,417 psi | 86% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,128 psi | 89% | 2936 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,095 psi | 81% | 2858 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 84% | 53,519 psi | 88% | 2848 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,243 psi | 87% | 2940 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,258 psi | 87% | 2999 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,012 psi | 89% | 3051 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,867 psi | 88% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 52,127 psi | 86% | 2956 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,975 psi | 71% | 2969 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,882 psi | 88% | 2913 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,388 psi | 88% | 2933 fps | 97.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 49,240 psi | 81% | 2756 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,181 psi | 77% | 2749 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 36,100 psi | 59% | 2615 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 46,601 psi | 77% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,085 psi | 58% | 2608 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 80% | 44,164 psi | 73% | 2730 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 44,701 psi | 73% | 2822 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,399 psi | 79% | 2943 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,469 psi | 73% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,529 psi | 78% | 2825 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,577 psi | 57% | 2621 fps | 97.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,986 psi | 64% | 2749 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,135 psi | 72% | 2812 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,295 psi | 73% | 2861 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,847 psi | 44% | 2421 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,519 psi | 57% | 2654 fps | 95.8% |
| Alliant Reloder-26 | 98.5 gr | 86% | 32,953 psi | 54% | 2661 fps | 96.1% |
| Bofors RP15 | <<locked>> | 98% | 43,526 psi | 71% | 2844 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 44,599 psi | 73% | 2766 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,295 psi | 73% | 2861 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 39,494 psi | 65% | 2631 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 45,150 psi | 74% | 2776 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 37,115 psi | 61% | 2654 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 42,902 psi | 70% | 2740 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,010 psi | 53% | 2513 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,052 psi | 81% | 2871 fps | 100% |
| Hodgdon Superformance | 96.8 gr | 82% | 38,783 psi | 64% | 2723 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 44% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,227 psi | 82% | 2838 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,441 psi | 76% | 2766 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,689 psi | 80% | 2792 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 40,059 psi | 66% | 2664 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,944 psi | 67% | 2664 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 33,939 psi | 56% | 2566 fps | 97% |
| IMR 4895 | <<locked>> | 80% | 48,718 psi | 80% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,662 psi | 83% | 2867 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 51,126 psi | 84% | 2805 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,659 psi | 77% | 2762 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,508 psi | 63% | 2615 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 36,709 psi | 60% | 2592 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 34,751 psi | 57% | 2582 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 50,923 psi | 84% | 2825 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,401 psi | 84% | 2825 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,876 psi | 77% | 2812 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,324 psi | 74% | 2812 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 37,956 psi | 62% | 2753 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 35,128 psi | 58% | 2608 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 80% | 47,094 psi | 77% | 2831 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,405 psi | 60% | 2648 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 98% | 41,002 psi | 67% | 2769 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,528 psi | 45% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,165 psi | 74% | 2756 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,184 psi | 84% | 2943 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,423 psi | 68% | 2808 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,824 psi | 57% | 2625 fps | 96.9% |
| ReloadSwiss RS 70 | 90.8 gr | 80% | 34,142 psi | 56% | 2628 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 48,501 psi | 80% | 2779 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,061 psi | 69% | 2710 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 49,327 psi | 81% | 2851 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 92% | 43,134 psi | 71% | 2792 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 39,494 psi | 65% | 2631 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,508 psi | 63% | 2615 fps | 96.9% |
| Shooters World Precision | <<locked>> | 80% | 46,659 psi | 77% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,709 psi | 60% | 2592 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,091 psi | 71% | 2762 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,502 psi | 83% | 2851 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,793 psi | 85% | 2759 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,642 psi | 72% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,681 psi | 62% | 2556 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,728 psi | 70% | 2785 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 51,547 psi | 85% | 2759 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,511 psi | 70% | 2710 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 31,633 psi | 52% | 2562 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 41,002 psi | 67% | 2717 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 48,559 psi | 80% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,820 psi | 80% | 2756 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,509 psi | 67% | 2641 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,477 psi | 60% | 2608 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 43,105 psi | 71% | 2749 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 47,152 psi | 77% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,998 psi | 59% | 2608 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 29,341 psi | 48% | 2500 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 98% | 50,502 psi | 83% | 2989 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,795 psi | 59% | 2579 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 37,231 psi | 61% | 2657 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,353 psi | 42% | 2444 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,328 psi | 83% | 2854 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,366 psi | 71% | 2759 fps | 95.1% |
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 102 powders for .375 Swiss P loaded with the .375 | 250gr | Speer TBBC. Alliant Reloder-26 delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,117 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 55–90 %, 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .375 Swiss P with the .375 | 250gr | Speer TBBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 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.