Load Specifications
Load data in caliber .375 Swiss P with .375 | 270gr | Barnes X S bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 54,505 psi | 89% | 2749 fps | 98.8% |
| Accurate 3100 | <<locked>> | 98% | 53,171 psi | 87% | 2808 fps | 99.7% |
| Accurate 4350 | <<locked>> | 88% | 51,706 psi | 85% | 2802 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 53,330 psi | 88% | 2940 fps | 97.4% |
| Accurate MAGPRO | <<locked>> | 98% | 54,230 psi | 89% | 2936 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 53,882 psi | 88% | 2769 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,085 psi | 90% | 2884 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 98% | 52,881 psi | 87% | 2877 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 51,953 psi | 85% | 2831 fps | 97.9% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 51,953 psi | 85% | 2831 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,940 psi | 90% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,013 psi | 90% | 2900 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 52,605 psi | 86% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,621 psi | 90% | 2877 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,083 psi | 86% | 2884 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,562 psi | 86% | 2871 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,122 psi | 76% | 2808 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 52,402 psi | 86% | 2953 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,995 psi | 84% | 2864 fps | 97.8% |
| Bofors RP3 | <<locked>> | 82% | 52,779 psi | 87% | 2766 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 52,083 psi | 86% | 2884 fps | 98.1% |
| Bofors RP7 | <<locked>> | 86% | 52,011 psi | 85% | 2746 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 82% | 52,794 psi | 87% | 2779 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 53,142 psi | 87% | 2844 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 86% | 52,924 psi | 87% | 2802 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 96% | 53,040 psi | 87% | 2825 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,924 psi | 85% | 2805 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 52,301 psi | 86% | 2779 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,136 psi | 74% | 2838 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 88% | 52,721 psi | 87% | 2874 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,854 psi | 61% | 1742 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,490 psi | 88% | 2753 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 52,446 psi | 86% | 2776 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,997 psi | 87% | 2766 fps | 99.1% |
| IMR 4831 | <<locked>> | 90% | 51,982 psi | 85% | 2792 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,636 psi | 90% | 2815 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,838 psi | 88% | 2910 fps | 97.1% |
| Lovex S062 | <<locked>> | 82% | 54,157 psi | 89% | 2749 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,737 psi | 88% | 2772 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 54,911 psi | 90% | 2815 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,747 psi | 78% | 2723 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 54,520 psi | 90% | 2805 fps | 100% |
| Norma 204 | <<locked>> | 90% | 52,794 psi | 87% | 2825 fps | 97.9% |
| Norma MRP | <<locked>> | 98% | 55,071 psi | 90% | 2966 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 53,490 psi | 88% | 2835 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,868 psi | 90% | 2825 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,244 psi | 89% | 2923 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 90% | 52,040 psi | 85% | 2831 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,907 psi | 80% | 2808 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,666 psi | 62% | 1785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 52,504 psi | 86% | 2759 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 52,199 psi | 86% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,462 psi | 89% | 2874 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 52,547 psi | 86% | 2894 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,165 psi | 74% | 2835 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 84% | 52,953 psi | 87% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 53,417 psi | 88% | 2802 fps | 97% |
| Rottweil R 905 | <<locked>> | 96% | 53,954 psi | 89% | 2864 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 86% | 52,011 psi | 85% | 2746 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,737 psi | 88% | 2772 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 54,157 psi | 89% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,911 psi | 90% | 2815 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,534 psi | 88% | 2812 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,374 psi | 88% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,098 psi | 87% | 2723 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,476 psi | 88% | 2861 fps | 98.3% |
| Somchem S355 | <<locked>> | 84% | 52,866 psi | 87% | 2759 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,779 psi | 85% | 2743 fps | 95.8% |
| Somchem S365 | <<locked>> | 92% | 52,634 psi | 86% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,853 psi | 90% | 2841 fps | 99% |
| Vihtavuori N150 | <<locked>> | 86% | 53,650 psi | 88% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 51,953 psi | 85% | 2776 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,853 psi | 88% | 2815 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 54,491 psi | 89% | 2730 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,650 psi | 90% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 52,315 psi | 86% | 2851 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 51,793 psi | 85% | 2890 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,476 psi | 89% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,287 psi | 87% | 2848 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,921 psi | 79% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,520 psi | 90% | 2831 fps | 98.2% |
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 2700 | <<locked>> | 80% | 51,285 psi | 84% | 2697 fps | 98.3% |
| Accurate 3100 | <<locked>> | 82% | 32,372 psi | 53% | 2405 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 40,176 psi | 66% | 2595 fps | 99% |
| Accurate High Country | 96.4 gr | 90% | 43,845 psi | 72% | 2766 fps | 95% |
| Accurate MAGPRO | <<locked>> | 96% | 50,720 psi | 83% | 2877 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 47,892 psi | 79% | 2671 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 43,163 psi | 71% | 2671 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 94% | 46,731 psi | 77% | 2766 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,799 psi | 67% | 2618 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,799 psi | 67% | 2618 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,863 psi | 80% | 2700 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,363 psi | 63% | 2595 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,163 psi | 71% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,379 psi | 66% | 2612 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,625 psi | 67% | 2664 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,022 psi | 48% | 2375 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,503 psi | 53% | 2487 fps | 95.7% |
| Alliant Reloder-26 | 88.3 gr | 80% | 30,908 psi | 51% | 2487 fps | 96% |
| Bofors RP15 | <<locked>> | 94% | 42,699 psi | 70% | 2707 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 49,588 psi | 81% | 2717 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,625 psi | 67% | 2664 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,555 psi | 72% | 2592 fps | 97% |
| Hodgdon H380 | <<locked>> | 80% | 49,574 psi | 81% | 2726 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 41,365 psi | 68% | 2628 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 80% | 44,005 psi | 72% | 2641 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 49,748 psi | 82% | 2769 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,849 psi | 80% | 2753 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,216 psi | 59% | 2493 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,089 psi | 66% | 2720 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 40,219 psi | 66% | 2638 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 46% | 1558 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,386 psi | 83% | 2703 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 39,001 psi | 64% | 2523 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,440 psi | 73% | 2615 fps | 97.7% |
| IMR 4831 | <<locked>> | 80% | 38,363 psi | 63% | 2546 fps | 98.8% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,501 psi | 80% | 2710 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 47,543 psi | 78% | 2795 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 51,111 psi | 84% | 2703 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,612 psi | 70% | 2579 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 40,915 psi | 67% | 2562 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 33,533 psi | 55% | 2434 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 51,256 psi | 84% | 2753 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,540 psi | 71% | 2657 fps | 95.8% |
| Norma MRP | 92.1 gr | 86% | 37,463 psi | 62% | 2621 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 39,334 psi | 65% | 2582 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 51,416 psi | 84% | 2776 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,512 psi | 73% | 2746 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 38,072 psi | 63% | 2569 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 94% | 39,987 psi | 66% | 2635 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,253 psi | 46% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,327 psi | 81% | 2707 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,643 psi | 75% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,523 psi | 65% | 2608 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,043 psi | 62% | 2612 fps | 98.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,188 psi | 61% | 2644 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 46,891 psi | 77% | 2667 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,442 psi | 78% | 2700 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 39,537 psi | 65% | 2598 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 43,555 psi | 72% | 2592 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,612 psi | 70% | 2579 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 51,111 psi | 84% | 2703 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,915 psi | 67% | 2562 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,340 psi | 78% | 2713 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,442 psi | 78% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,785 psi | 69% | 2523 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,756 psi | 69% | 2648 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,862 psi | 77% | 2661 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,646 psi | 80% | 2687 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,013 psi | 59% | 2546 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 38,116 psi | 63% | 2536 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 44,730 psi | 73% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,625 psi | 67% | 2572 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 39,537 psi | 65% | 2559 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,329 psi | 84% | 2684 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,277 psi | 66% | 2582 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 32,155 psi | 53% | 2454 fps | 97.7% |
| Vihtavuori N560 | <<locked>> | 94% | 48,675 psi | 80% | 2835 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,595 psi | 65% | 2543 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,495 psi | 68% | 2631 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,078 psi | 43% | 2369 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,989 psi | 69% | 2615 fps | 95.5% |
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 81 powders for .375 Swiss P loaded with the .375 | 270gr | Barnes X S. Norma MRP delivers the highest muzzle velocity at 2,966 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,966 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 81 of the 81 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, 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. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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, Accurate High Country, Norma MRP rank at the top here: for .375 Swiss P with the .375 | 270gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.