Load Specifications
Bullet:.375 | 300gr | Woodleigh HS
Bullet Manufacturer:Woodleigh
Bullet Weight:300 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:37 XC 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 37 XC with .375 | 300gr | Woodleigh HS bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Accurate MAGPRO 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.
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>> | 82% | 62,642 psi | 90% | 2743 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 59,146 psi | 85% | 2795 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 59,408 psi | 85% | 2864 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 59,408 psi | 85% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 61,177 psi | 88% | 2894 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 61,061 psi | 88% | 3035 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 62,134 psi | 89% | 3038 fps | 99.7% |
| ADI APS 450 | <<locked>> | 84% | 62,859 psi | 90% | 2188 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 62,134 psi | 89% | 2844 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 61,815 psi | 89% | 2959 fps | 100% |
| ADI AR 2213 | <<locked>> | 98% | 59,480 psi | 85% | 2976 fps | 99.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,441 psi | 67% | 2762 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,249 psi | 59% | 2736 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 61,917 psi | 89% | 2956 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 59,886 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 59,973 psi | 86% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 61,873 psi | 89% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 59,393 psi | 85% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 61,105 psi | 88% | 2949 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 98% | 59,146 psi | 85% | 2969 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 60,060 psi | 86% | 2917 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,938 psi | 75% | 2887 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 61,192 psi | 88% | 3025 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 61,264 psi | 88% | 2933 fps | 98.5% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,885 psi | 83% | 2949 fps | 100% |
| Bofors RP3 | <<locked>> | 84% | 61,192 psi | 88% | 2838 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,935 psi | 69% | 2838 fps | 99.3% |
| Bofors RP5 | <<locked>> | 98% | 59,146 psi | 85% | 2969 fps | 100% |
| Bofors RP7 | <<locked>> | 88% | 59,857 psi | 86% | 2848 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,184 psi | 74% | 2844 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 84% | 61,250 psi | 88% | 2864 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 58,958 psi | 85% | 2904 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 61,989 psi | 89% | 2913 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 59,582 psi | 86% | 2910 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 62,352 psi | 90% | 2946 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 62,033 psi | 89% | 2854 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 62,874 psi | 90% | 2884 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,908 psi | 73% | 2959 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 59,712 psi | 86% | 2946 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,999 psi | 53% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 62,569 psi | 90% | 2841 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 61,656 psi | 89% | 2825 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 60,321 psi | 87% | 2825 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 61,453 psi | 88% | 2884 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 88% | 61,482 psi | 88% | 2867 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 61,322 psi | 88% | 2881 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 61,525 psi | 88% | 2867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 60,350 psi | 87% | 2887 fps | 99.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 61,061 psi | 88% | 3005 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 36,840 psi | 53% | 2641 fps | 96.8% |
| Lovex S060 | <<locked>> | 82% | 62,656 psi | 90% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 62,076 psi | 89% | 2812 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 61,975 psi | 89% | 2858 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 59,901 psi | 86% | 2861 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,910 psi | 76% | 2779 fps | 100% |
| Norma 203B | <<locked>> | 82% | 59,277 psi | 85% | 2831 fps | 100% |
| Norma 204 | <<locked>> | 92% | 62,903 psi | 90% | 2949 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 36,753 psi | 53% | 2667 fps | 98.8% |
| Norma MRP | <<locked>> | 96% | 59,088 psi | 85% | 2989 fps | 100% |
| Norma URP | <<locked>> | 90% | 59,234 psi | 85% | 2877 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 60,524 psi | 87% | 2858 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 62,178 psi | 89% | 3025 fps | 100% |
| Ramshot Hunter | <<locked>> | 92% | 61,960 psi | 89% | 2940 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,970 psi | 80% | 2904 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,768 psi | 54% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 60,800 psi | 87% | 2851 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 58,929 psi | 85% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 61,264 psi | 88% | 2920 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 59,524 psi | 86% | 2956 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,358 psi | 74% | 2956 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,137 psi | 66% | 2844 fps | 98% |
| Rottweil R 902 | <<locked>> | 82% | 60,292 psi | 87% | 2776 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 61,380 psi | 88% | 2835 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 59,335 psi | 85% | 2877 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 96% | 60,626 psi | 87% | 2936 fps | 100% |
| Rottweil R 907 | <<locked>> | 88% | 59,857 psi | 86% | 2848 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 90% | 61,975 psi | 89% | 2858 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 62,076 psi | 89% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 59,901 psi | 86% | 2861 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 59,074 psi | 85% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 61,206 psi | 88% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 61,467 psi | 88% | 2815 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 60,147 psi | 86% | 2933 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 60,945 psi | 88% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 61,221 psi | 88% | 2871 fps | 99.6% |
| Somchem S365 | <<locked>> | 92% | 59,640 psi | 86% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 61,250 psi | 88% | 2907 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 61,017 psi | 88% | 2720 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 60,901 psi | 87% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 62,366 psi | 90% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 61,308 psi | 88% | 2864 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 60,611 psi | 87% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 84% | 62,830 psi | 90% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 60,437 psi | 87% | 2877 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 62,642 psi | 90% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 58,943 psi | 85% | 2992 fps | 99.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,549 psi | 78% | 2913 fps | 99.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 47,616 psi | 68% | 2854 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 61,003 psi | 88% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 59,146 psi | 85% | 2904 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,464 psi | 83% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 61,583 psi | 88% | 2907 fps | 100% |
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% | 58,711 psi | 84% | 2697 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 55,434 psi | 80% | 2746 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 32,430 psi | 47% | 2415 fps | 98.4% |
| Accurate 4064 | <<locked>> | 80% | 55,782 psi | 80% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 43,613 psi | 63% | 2644 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 34,882 psi | 50% | 2572 fps | 95.8% |
| Accurate MAGPRO | 98.2 gr | 84% | 37,869 psi | 54% | 2628 fps | 95.4% |
| ADI APS 450 | <<locked>> | 80% | 58,798 psi | 84% | 2136 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 51,750 psi | 74% | 2707 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,506 psi | 52% | 2536 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 82% | 34,838 psi | 50% | 2523 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 92% | 35,708 psi | 51% | 2539 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 88% | 28,181 psi | 40% | 2398 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,796 psi | 53% | 2536 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,939 psi | 76% | 2730 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 56,304 psi | 81% | 2799 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,872 psi | 60% | 2654 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,153 psi | 69% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,506 psi | 52% | 2533 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 32,372 psi | 47% | 2480 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,154 psi | 45% | 2444 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,238 psi | 39% | 2362 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,707 psi | 48% | 2579 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 45,078 psi | 65% | 2667 fps | 95.1% |
| Bofors RP15 | <<locked>> | 82% | 32,184 psi | 46% | 2474 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 53,795 psi | 77% | 2746 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 32,097 psi | 46% | 2507 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 32,372 psi | 47% | 2480 fps | 96.1% |
| Bofors RP7 | <<locked>> | 80% | 46,717 psi | 67% | 2648 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 34,229 psi | 49% | 2507 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 53,751 psi | 77% | 2766 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,310 psi | 65% | 2697 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 48,037 psi | 69% | 2707 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 37,130 psi | 53% | 2530 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 36,463 psi | 52% | 2513 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,450 psi | 57% | 2539 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 58,885 psi | 85% | 2838 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 30,226 psi | 43% | 2490 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 44,614 psi | 64% | 2723 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 40% | 1552 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 58,784 psi | 84% | 2795 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,476 psi | 78% | 2733 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 56,681 psi | 81% | 2776 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,148 psi | 61% | 2585 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,080 psi | 69% | 2674 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 41,582 psi | 60% | 2595 fps | 100% |
| IMR 4895 | <<locked>> | 80% | 57,769 psi | 83% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 36,593 psi | 53% | 2477 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 84% | 35,708 psi | 51% | 2559 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 32,430 psi | 47% | 2533 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 58,914 psi | 85% | 2753 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 54,926 psi | 79% | 2723 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 45,658 psi | 66% | 2625 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 43,976 psi | 63% | 2618 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 27,934 psi | 40% | 2300 fps | 96.9% |
| Norma 203B | <<locked>> | 80% | 55,637 psi | 80% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 80% | 42,003 psi | 60% | 2628 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 28,456 psi | 41% | 2448 fps | 95.6% |
| Norma MRP | 91.8 gr | 80% | 33,692 psi | 48% | 2543 fps | 98% |
| Norma URP | <<locked>> | 80% | 42,989 psi | 62% | 2638 fps | 100% |
| Ramshot Big Game | <<locked>> | 80% | 56,695 psi | 81% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 35,143 psi | 50% | 2559 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 41,771 psi | 60% | 2638 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 29,124 psi | 42% | 2388 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,239 psi | 41% | 1588 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,563 psi | 77% | 2756 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,068 psi | 73% | 2799 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,439 psi | 62% | 2667 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,814 psi | 60% | 2690 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 27,325 psi | 39% | 2402 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 37,144 psi | 53% | 2661 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 56,753 psi | 82% | 2733 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 50,720 psi | 73% | 2697 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 37,985 psi | 55% | 2516 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 35,708 psi | 51% | 2516 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 80% | 46,717 psi | 67% | 2648 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,658 psi | 66% | 2625 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 54,926 psi | 79% | 2723 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,976 psi | 63% | 2618 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,938 psi | 75% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,952 psi | 73% | 2572 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,628 psi | 64% | 2575 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,375 psi | 51% | 2510 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 50,546 psi | 73% | 2690 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 38,566 psi | 55% | 2500 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 39,726 psi | 57% | 2592 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,390 psi | 52% | 2503 fps | 98.1% |
| Vihtavuori N135 | <<locked>> | 80% | 57,334 psi | 82% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 57,377 psi | 82% | 2697 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 48,443 psi | 70% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,367 psi | 64% | 2628 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 31,401 psi | 45% | 2382 fps | 96.2% |
| Vihtavuori N540 | <<locked>> | 80% | 55,419 psi | 80% | 2700 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 43,714 psi | 63% | 2635 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 34,911 psi | 50% | 2516 fps | 99.9% |
| Vihtavuori N560 | 94.1 gr | 82% | 36,463 psi | 52% | 2589 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 86% | 33,910 psi | 49% | 2526 fps | 95% |
| Vihtavuori N568 | <<locked>> | 94% | 38,696 psi | 56% | 2677 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,294 psi | 62% | 2589 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,440 psi | 65% | 2700 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,630 psi | 40% | 2470 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 33,054 psi | 47% | 2428 fps | 96.1% |
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 37 XC loaded with the .375 | 300gr | Woodleigh HS. Accurate MAGPRO delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,736 fps to 3,038 fps. ADI AR 2217 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 (480 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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 N560, Accurate MAGPRO, Norma MRP rank at the top here: for 37 XC with the .375 | 300gr | Woodleigh HS 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.