Load Specifications
Bullet:.375 | 300gr | Woodleigh FMJ
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 FMJ bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Accurate High Country and Alliant Reloder-26.
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: 30"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 60,698 psi | 87% | 2828 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 61,757 psi | 89% | 2900 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 61,119 psi | 88% | 2789 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 59,219 psi | 85% | 2881 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 59,350 psi | 85% | 3022 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 60,336 psi | 87% | 3025 fps | 99.7% |
| ADI APS 450 | <<locked>> | 82% | 60,959 psi | 88% | 2182 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 60,104 psi | 86% | 2831 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 59,872 psi | 86% | 2946 fps | 100% |
| ADI AR 2213 | <<locked>> | 98% | 61,656 psi | 89% | 3018 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,153 psi | 69% | 2808 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,931 psi | 62% | 2779 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 60,002 psi | 86% | 2943 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 60,002 psi | 86% | 2943 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 61,540 psi | 88% | 2848 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 61,656 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 59,944 psi | 86% | 2930 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 61,554 psi | 88% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 59,219 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 98% | 61,438 psi | 88% | 3005 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 62,526 psi | 90% | 2953 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,056 psi | 78% | 2927 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 59,393 psi | 85% | 3009 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 59,234 psi | 85% | 2920 fps | 98.4% |
| Bofors RP15ᴾ | <<locked>> | 100% | 60,133 psi | 86% | 2989 fps | 100% |
| Bofors RP3 | <<locked>> | 82% | 59,088 psi | 85% | 2822 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,053 psi | 72% | 2881 fps | 99.6% |
| Bofors RP5 | <<locked>> | 98% | 61,438 psi | 88% | 3005 fps | 100% |
| Bofors RP7 | <<locked>> | 88% | 61,598 psi | 88% | 2881 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,026 psi | 76% | 2887 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 84% | 62,946 psi | 90% | 2897 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 60,930 psi | 88% | 2940 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 59,843 psi | 86% | 2897 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 61,569 psi | 88% | 2949 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 60,336 psi | 87% | 2933 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 60,147 psi | 86% | 2844 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,069 psi | 76% | 3005 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 62,091 psi | 89% | 2986 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 53% | 1752 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 59,553 psi | 86% | 2812 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 61,772 psi | 89% | 2858 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 59,379 psi | 85% | 2867 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 88% | 62,990 psi | 90% | 2900 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 59,364 psi | 85% | 2867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 62,265 psi | 89% | 2927 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 98% | 59,292 psi | 85% | 2995 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 38,493 psi | 55% | 2690 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 60,017 psi | 86% | 2799 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 59,828 psi | 86% | 2844 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 61,757 psi | 89% | 2894 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,027 psi | 79% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 82% | 60,930 psi | 88% | 2861 fps | 100% |
| Norma 204 | <<locked>> | 90% | 60,727 psi | 87% | 2933 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 38,435 psi | 55% | 2713 fps | 99.3% |
| Norma MRP | <<locked>> | 96% | 61,424 psi | 88% | 3028 fps | 100% |
| Norma URP | <<locked>> | 90% | 61,221 psi | 88% | 2913 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 62,381 psi | 90% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 60,234 psi | 87% | 3015 fps | 100% |
| Ramshot Hunter | <<locked>> | 90% | 60,031 psi | 86% | 2927 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 58,450 psi | 84% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,884 psi | 54% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 62,555 psi | 90% | 2887 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 61,134 psi | 88% | 2930 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 59,263 psi | 85% | 2907 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 61,670 psi | 89% | 2992 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,664 psi | 77% | 3002 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,515 psi | 70% | 2897 fps | 98.7% |
| Rottweil R 902 | <<locked>> | 82% | 61,859 psi | 89% | 2805 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 59,277 psi | 85% | 2818 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 61,076 psi | 88% | 2913 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 96% | 62,874 psi | 90% | 2976 fps | 100% |
| Rottweil R 907 | <<locked>> | 88% | 61,598 psi | 88% | 2881 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 88% | 59,828 psi | 86% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 60,017 psi | 86% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 61,757 psi | 89% | 2894 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 60,930 psi | 88% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 62,627 psi | 90% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 59,306 psi | 85% | 2802 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 62,395 psi | 90% | 2972 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 62,526 psi | 90% | 2858 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 59,117 psi | 85% | 2854 fps | 99.6% |
| Somchem S365 | <<locked>> | 92% | 61,844 psi | 89% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 59,335 psi | 85% | 2894 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 62,569 psi | 90% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 62,569 psi | 90% | 2769 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 60,220 psi | 87% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 59,321 psi | 85% | 2851 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 62,714 psi | 90% | 2917 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 53,693 psi | 77% | 2831 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 82% | 60,611 psi | 87% | 2772 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 62,279 psi | 89% | 2910 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 61,090 psi | 88% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 61,192 psi | 88% | 3031 fps | 99.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,797 psi | 82% | 2956 fps | 99.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 49,719 psi | 71% | 2900 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 47,050 psi | 68% | 2890 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 58,929 psi | 85% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 61,076 psi | 88% | 2943 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 60,539 psi | 87% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 59,495 psi | 85% | 2894 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 2700 | <<locked>> | 80% | 57,000 psi | 82% | 2779 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 33,649 psi | 48% | 2451 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 57,464 psi | 83% | 2746 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 45,179 psi | 65% | 2680 fps | 100% |
| Accurate High Country | 94.8 gr | 80% | 36,390 psi | 52% | 2615 fps | 96.6% |
| Accurate MAGPRO | 99 gr | 82% | 36,811 psi | 53% | 2612 fps | 95.2% |
| ADI APS 450 | <<locked>> | 80% | 58,943 psi | 85% | 2156 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 53,185 psi | 76% | 2740 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,681 psi | 54% | 2572 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 35,955 psi | 52% | 2562 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 90% | 34,722 psi | 50% | 2530 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 86% | 27,470 psi | 39% | 2388 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,058 psi | 55% | 2575 fps | 97.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,058 psi | 55% | 2575 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,331 psi | 78% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 57,856 psi | 83% | 2828 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,366 psi | 62% | 2690 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,980 psi | 72% | 2799 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,710 psi | 54% | 2569 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 33,533 psi | 48% | 2516 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,358 psi | 46% | 2480 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,181 psi | 40% | 2402 fps | 97.9% |
| Alliant Reloder-26 | 97.6 gr | 80% | 35,143 psi | 50% | 2618 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 43,540 psi | 63% | 2651 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 31,256 psi | 45% | 2457 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 55,303 psi | 79% | 2776 fps | 100% |
| Bofors RP30 | <<locked>> | 86% | 31,256 psi | 45% | 2490 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 33,533 psi | 48% | 2516 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 48,051 psi | 69% | 2684 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 33,112 psi | 48% | 2490 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 55,361 psi | 80% | 2799 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 46,818 psi | 67% | 2733 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 49,385 psi | 71% | 2743 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 35,853 psi | 52% | 2510 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 35,244 psi | 51% | 2497 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,915 psi | 59% | 2572 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 29,385 psi | 42% | 2474 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 46,238 psi | 66% | 2759 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 40% | 1565 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 55,999 psi | 80% | 2766 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 57,986 psi | 83% | 2808 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,395 psi | 62% | 2621 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,269 psi | 71% | 2703 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 42,989 psi | 62% | 2628 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 37,695 psi | 54% | 2513 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 34,577 psi | 50% | 2543 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 33,765 psi | 49% | 2575 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 56,463 psi | 81% | 2756 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 46,978 psi | 67% | 2657 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 45,179 psi | 65% | 2651 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 29,066 psi | 42% | 2336 fps | 97.5% |
| Norma 203B | <<locked>> | 80% | 57,203 psi | 82% | 2815 fps | 100% |
| Norma 204 | <<locked>> | 80% | 43,395 psi | 62% | 2664 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 27,789 psi | 40% | 2434 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 35,056 psi | 50% | 2585 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 44,309 psi | 64% | 2671 fps | 100% |
| Ramshot Big Game | <<locked>> | 80% | 58,407 psi | 84% | 2841 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 33,982 psi | 49% | 2543 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 43,178 psi | 62% | 2671 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 28,239 psi | 41% | 2372 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,384 psi | 41% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 55,027 psi | 79% | 2789 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,098 psi | 76% | 2831 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,092 psi | 65% | 2703 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,308 psi | 62% | 2726 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 28,355 psi | 41% | 2448 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 36,085 psi | 52% | 2644 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 58,204 psi | 84% | 2762 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 52,141 psi | 75% | 2726 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,059 psi | 56% | 2549 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 36,999 psi | 53% | 2552 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 48,051 psi | 69% | 2684 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,978 psi | 67% | 2657 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 56,463 psi | 81% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 45,179 psi | 65% | 2651 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,505 psi | 77% | 2785 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,257 psi | 75% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,847 psi | 66% | 2605 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,666 psi | 53% | 2549 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 52,054 psi | 75% | 2723 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 39,769 psi | 57% | 2539 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 41,263 psi | 59% | 2625 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,579 psi | 54% | 2536 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 80% | 58,929 psi | 85% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 58,755 psi | 84% | 2726 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 49,705 psi | 71% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,745 psi | 66% | 2657 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 32,518 psi | 47% | 2415 fps | 96.8% |
| Vihtavuori N170 | <<locked>> | 98% | 50,111 psi | 72% | 2776 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 56,942 psi | 82% | 2730 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 45,136 psi | 65% | 2667 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,361 psi | 52% | 2552 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 35,331 psi | 51% | 2572 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 86% | 35,331 psi | 51% | 2566 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 92% | 37,695 psi | 54% | 2664 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 98% | 43,859 psi | 63% | 2828 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,759 psi | 64% | 2618 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,949 psi | 67% | 2736 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,703 psi | 41% | 2510 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,272 psi | 49% | 2464 fps | 96.8% |
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 100 powders for 37 XC loaded with the .375 | 300gr | Woodleigh FMJ. Winchester StaBALL HD delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,752 fps to 3,048 fps. ADI AR 2217 gives the best case fill at 100 %, and 100 of the 100 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. Accurate MAGPRO, Accurate High Country, Alliant Reloder-26 rank at the top here: for 37 XC with the .375 | 300gr | Woodleigh FMJ 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.