Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:307 gr
Bullet Diameter:0.376"
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 .376 | 307gr | Peregrine Backup (VRG-2) bullet and 100 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% | 61,960 psi | 89% | 2713 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 59,190 psi | 85% | 2772 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 59,234 psi | 85% | 2838 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 62,540 psi | 90% | 2772 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 61,105 psi | 88% | 2867 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 62,279 psi | 89% | 3015 fps | 99.8% |
| ADI APS 450 | <<locked>> | 84% | 62,830 psi | 90% | 2169 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 62,294 psi | 89% | 2822 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 62,091 psi | 89% | 2940 fps | 100% |
| ADI AR 2213 | <<locked>> | 98% | 59,712 psi | 86% | 2956 fps | 99.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,369 psi | 67% | 2743 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,046 psi | 59% | 2713 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 62,134 psi | 89% | 2933 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 59,727 psi | 86% | 2792 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 59,814 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 62,004 psi | 89% | 2920 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 59,582 psi | 86% | 2890 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 61,279 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 98% | 59,306 psi | 85% | 2943 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 60,249 psi | 87% | 2890 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,040 psi | 75% | 2864 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 61,380 psi | 88% | 2999 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 61,453 psi | 88% | 2913 fps | 98.7% |
| Bofors RP15ᴾ | <<locked>> | 100% | 58,001 psi | 83% | 2927 fps | 100% |
| Bofors RP3 | <<locked>> | 84% | 61,061 psi | 88% | 2812 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,906 psi | 69% | 2815 fps | 99.4% |
| Bofors RP5 | <<locked>> | 98% | 59,306 psi | 85% | 2943 fps | 100% |
| Bofors RP7 | <<locked>> | 88% | 59,857 psi | 86% | 2822 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,198 psi | 74% | 2825 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 84% | 61,235 psi | 88% | 2841 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 59,088 psi | 85% | 2881 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 62,018 psi | 89% | 2887 fps | 100% |
| Hodgdon H4831 | <<locked>> | 96% | 59,596 psi | 86% | 2890 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 62,584 psi | 90% | 2927 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 62,221 psi | 89% | 2831 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,952 psi | 73% | 2940 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 59,944 psi | 86% | 2923 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 53% | 1716 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 62,598 psi | 90% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 61,612 psi | 89% | 2799 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 60,249 psi | 87% | 2802 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 61,453 psi | 88% | 2858 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 88% | 61,467 psi | 88% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 61,177 psi | 88% | 2854 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 61,409 psi | 88% | 2841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 60,539 psi | 87% | 2867 fps | 99.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 61,337 psi | 88% | 2986 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 36,550 psi | 53% | 2618 fps | 97.1% |
| Lovex S060 | <<locked>> | 82% | 62,642 psi | 90% | 2776 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 61,859 psi | 89% | 2785 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 61,786 psi | 89% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 59,857 psi | 86% | 2838 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,620 psi | 76% | 2753 fps | 100% |
| Norma 203B | <<locked>> | 84% | 62,990 psi | 90% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 90% | 58,914 psi | 85% | 2874 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 36,419 psi | 52% | 2641 fps | 99% |
| Norma MRP | <<locked>> | 96% | 59,248 psi | 85% | 2966 fps | 100% |
| Norma URP | <<locked>> | 90% | 59,277 psi | 85% | 2851 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 60,481 psi | 87% | 2835 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 62,511 psi | 90% | 3005 fps | 100% |
| Ramshot Hunter | <<locked>> | 92% | 62,163 psi | 89% | 2917 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,072 psi | 81% | 2881 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,666 psi | 54% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 60,887 psi | 87% | 2831 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 59,205 psi | 85% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 61,134 psi | 88% | 2897 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 59,625 psi | 86% | 2930 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,329 psi | 74% | 2933 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,064 psi | 66% | 2825 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 82% | 60,002 psi | 86% | 2749 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 61,105 psi | 88% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 59,321 psi | 85% | 2854 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 96% | 60,785 psi | 87% | 2913 fps | 100% |
| Rottweil R 907 | <<locked>> | 88% | 59,857 psi | 86% | 2822 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 90% | 61,786 psi | 89% | 2831 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 61,859 psi | 89% | 2785 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 59,857 psi | 86% | 2838 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 59,176 psi | 85% | 2825 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 61,177 psi | 88% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 61,496 psi | 88% | 2795 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 60,321 psi | 87% | 2910 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 60,713 psi | 87% | 2802 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 61,119 psi | 88% | 2848 fps | 99.7% |
| Somchem S365 | <<locked>> | 92% | 59,582 psi | 86% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 61,105 psi | 88% | 2881 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 60,785 psi | 87% | 2694 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 60,988 psi | 88% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 62,236 psi | 89% | 2769 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 61,453 psi | 88% | 2838 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 60,742 psi | 87% | 2861 fps | 100% |
| Vihtavuori N540 | <<locked>> | 84% | 62,888 psi | 90% | 2766 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 60,278 psi | 87% | 2851 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 62,656 psi | 90% | 2917 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 59,103 psi | 85% | 2969 fps | 99.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,491 psi | 78% | 2890 fps | 99.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 47,558 psi | 68% | 2835 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 61,163 psi | 88% | 2799 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 59,234 psi | 85% | 2884 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,943 psi | 83% | 2986 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 61,728 psi | 89% | 2884 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% | 58,001 psi | 83% | 2667 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 55,405 psi | 80% | 2723 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 31,763 psi | 46% | 2385 fps | 98.5% |
| Accurate 4064 | <<locked>> | 80% | 55,129 psi | 79% | 2684 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 43,134 psi | 62% | 2618 fps | 100% |
| Accurate MAGPRO | 98.5 gr | 84% | 37,681 psi | 54% | 2605 fps | 95.7% |
| ADI APS 450 | <<locked>> | 80% | 58,784 psi | 84% | 2116 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 51,663 psi | 74% | 2684 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,318 psi | 52% | 2513 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 34,505 psi | 50% | 2500 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 33,170 psi | 48% | 2464 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 88% | 27,746 psi | 40% | 2372 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,521 psi | 52% | 2513 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,707 psi | 76% | 2703 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 56,130 psi | 81% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,684 psi | 60% | 2628 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,051 psi | 69% | 2736 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,187 psi | 52% | 2510 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 31,995 psi | 46% | 2454 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,719 psi | 44% | 2418 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,818 psi | 39% | 2336 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,272 psi | 48% | 2549 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 45,034 psi | 65% | 2648 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 29,791 psi | 43% | 2392 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 53,417 psi | 77% | 2717 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 31,720 psi | 46% | 2480 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 31,995 psi | 46% | 2454 fps | 96.3% |
| Bofors RP7 | <<locked>> | 80% | 46,398 psi | 67% | 2625 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 31,662 psi | 45% | 2428 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 53,650 psi | 77% | 2743 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,107 psi | 65% | 2671 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 47,906 psi | 69% | 2684 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 36,854 psi | 53% | 2503 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 36,172 psi | 52% | 2490 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,276 psi | 56% | 2516 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 29,791 psi | 43% | 2464 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 44,425 psi | 64% | 2697 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 40% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 58,740 psi | 84% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,360 psi | 78% | 2707 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 56,608 psi | 81% | 2753 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,047 psi | 60% | 2566 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,964 psi | 69% | 2651 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 41,350 psi | 59% | 2572 fps | 100% |
| IMR 4895 | <<locked>> | 80% | 57,609 psi | 83% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 36,405 psi | 52% | 2457 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 82% | 33,054 psi | 47% | 2477 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 32,039 psi | 46% | 2507 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 58,856 psi | 85% | 2730 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 54,665 psi | 79% | 2697 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 45,281 psi | 65% | 2598 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 43,613 psi | 63% | 2592 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 27,238 psi | 39% | 2267 fps | 96.9% |
| Norma 203B | <<locked>> | 80% | 55,463 psi | 80% | 2756 fps | 100% |
| Norma 204 | <<locked>> | 80% | 41,800 psi | 60% | 2602 fps | 98.6% |
| Norma 217 | <<locked>> | 92% | 27,876 psi | 40% | 2415 fps | 95.7% |
| Norma MRP | 92.1 gr | 80% | 33,373 psi | 48% | 2520 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 42,699 psi | 61% | 2612 fps | 100% |
| Ramshot Big Game | <<locked>> | 80% | 56,608 psi | 81% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 32,460 psi | 47% | 2477 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 41,495 psi | 60% | 2612 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 28,732 psi | 41% | 2365 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,123 psi | 40% | 1572 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,403 psi | 77% | 2730 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,068 psi | 73% | 2772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,250 psi | 62% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,611 psi | 60% | 2664 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 26,789 psi | 38% | 2372 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 36,825 psi | 53% | 2638 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 56,449 psi | 81% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 50,328 psi | 72% | 2671 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 37,695 psi | 54% | 2490 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 80% | 35,447 psi | 51% | 2493 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 80% | 46,398 psi | 67% | 2625 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,281 psi | 65% | 2598 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 54,665 psi | 79% | 2697 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,613 psi | 63% | 2592 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,764 psi | 74% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,763 psi | 73% | 2546 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,251 psi | 64% | 2549 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,128 psi | 50% | 2490 fps | 97.3% |
| Somchem S355 | <<locked>> | 80% | 50,241 psi | 72% | 2664 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 38,218 psi | 55% | 2480 fps | 96% |
| Somchem S365 | <<locked>> | 80% | 39,537 psi | 57% | 2569 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,926 psi | 52% | 2474 fps | 98.2% |
| Vihtavuori N135 | <<locked>> | 80% | 57,101 psi | 82% | 2651 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 57,261 psi | 82% | 2674 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 48,124 psi | 69% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,106 psi | 63% | 2602 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 30,980 psi | 45% | 2356 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 80% | 55,376 psi | 80% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 43,511 psi | 63% | 2612 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 34,403 psi | 49% | 2484 fps | 100% |
| Vihtavuori N560 | 94.4 gr | 82% | 36,230 psi | 52% | 2569 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 86% | 33,431 psi | 48% | 2497 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 94% | 38,348 psi | 55% | 2651 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,105 psi | 62% | 2562 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,237 psi | 65% | 2674 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,079 psi | 39% | 2441 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 32,663 psi | 47% | 2402 fps | 96.3% |
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 100 powders for 37 XC loaded with the .376 | 307gr | Peregrine Backup (VRG-2). Accurate MAGPRO delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,716 fps to 3,015 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 52–90 %, leaving at least 10 % headroom. The 307.0 gr projectile in 0.376" 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 .376 | 307gr | Peregrine Backup (VRG-2) 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.