Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:300 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 | 300gr | Peregrine Brass Backup (VRG-1) bullet and 109 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Vihtavuori N560 and Accurate MAGPRO.
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% | 60,553 psi | 87% | 2726 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 61,960 psi | 89% | 2835 fps | 100% |
| Accurate 3100ᴾ | <<locked>> | 100% | 61,844 psi | 89% | 2897 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 61,279 psi | 88% | 2789 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 59,553 psi | 86% | 2881 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 60,510 psi | 87% | 3022 fps | 99.6% |
| ADI APS 450 | <<locked>> | 84% | 62,830 psi | 90% | 2188 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 61,061 psi | 88% | 2835 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 60,640 psi | 87% | 2949 fps | 100% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 62,424 psi | 90% | 3018 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,208 psi | 65% | 2746 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,987 psi | 57% | 2717 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 62,178 psi | 89% | 2972 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 60,713 psi | 87% | 2943 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 62,439 psi | 90% | 2854 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 62,526 psi | 90% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 60,452 psi | 87% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 62,265 psi | 89% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 59,886 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 61,786 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 58,639 psi | 84% | 2904 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,604 psi | 73% | 2874 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 59,553 psi | 86% | 3012 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 60,176 psi | 86% | 2920 fps | 98.3% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,550 psi | 81% | 2936 fps | 100% |
| Bofors RP3 | <<locked>> | 84% | 59,683 psi | 86% | 2825 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,485 psi | 67% | 2818 fps | 99.1% |
| Bofors RP5ᴾ | <<locked>> | 100% | 61,786 psi | 89% | 3005 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 62,497 psi | 90% | 2884 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,792 psi | 72% | 2828 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 84% | 59,872 psi | 86% | 2851 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 61,714 psi | 89% | 2943 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 60,669 psi | 87% | 2900 fps | 100% |
| Hodgdon H4831 | <<locked>> | 98% | 62,279 psi | 89% | 2949 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 60,974 psi | 88% | 2933 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 60,727 psi | 87% | 2844 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 61,641 psi | 89% | 2874 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,588 psi | 71% | 2943 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 62,859 psi | 90% | 2989 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 53% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 61,467 psi | 88% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 60,524 psi | 87% | 2815 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 59,263 psi | 85% | 2815 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 60,147 psi | 86% | 2871 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 88% | 60,249 psi | 87% | 2854 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 59,727 psi | 86% | 2867 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 60,249 psi | 87% | 2858 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 59,292 psi | 85% | 2877 fps | 99.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 59,611 psi | 86% | 2992 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 35,505 psi | 51% | 2618 fps | 96.3% |
| Lovex S060 | <<locked>> | 82% | 61,627 psi | 89% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 60,756 psi | 87% | 2802 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 60,524 psi | 87% | 2844 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 62,381 psi | 90% | 2897 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,227 psi | 74% | 2762 fps | 100% |
| Norma 201 | <<locked>> | 82% | 61,743 psi | 89% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 82% | 62,816 psi | 90% | 2799 fps | 100% |
| Norma 203B | <<locked>> | 84% | 61,786 psi | 89% | 2867 fps | 100% |
| Norma 204 | <<locked>> | 92% | 61,670 psi | 89% | 2936 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 35,302 psi | 51% | 2641 fps | 98.5% |
| Norma MRP | <<locked>> | 98% | 61,757 psi | 89% | 3028 fps | 100% |
| Norma URP | <<locked>> | 92% | 61,815 psi | 89% | 2913 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 59,277 psi | 85% | 2848 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 60,814 psi | 87% | 3012 fps | 100% |
| Ramshot Hunter | <<locked>> | 92% | 60,698 psi | 87% | 2930 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,317 psi | 78% | 2887 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,521 psi | 54% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 59,611 psi | 86% | 2841 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 61,917 psi | 89% | 2936 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 59,625 psi | 86% | 2907 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 62,511 psi | 90% | 2995 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,806 psi | 72% | 2936 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 44,672 psi | 64% | 2825 fps | 97.7% |
| Rottweil R 902 | <<locked>> | 84% | 62,627 psi | 90% | 2808 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 59,872 psi | 86% | 2822 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 61,917 psi | 89% | 2913 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 96% | 59,321 psi | 85% | 2923 fps | 100% |
| Rottweil R 907 | <<locked>> | 90% | 62,497 psi | 90% | 2884 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 90% | 60,524 psi | 87% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 60,756 psi | 87% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 62,381 psi | 90% | 2897 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 61,830 psi | 89% | 2887 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 61,975 psi | 89% | 2848 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 62,308 psi | 90% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 60,089 psi | 86% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 60,205 psi | 86% | 2805 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 62,772 psi | 90% | 2969 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 61,917 psi | 89% | 2723 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 59,393 psi | 85% | 2815 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 59,857 psi | 86% | 2858 fps | 99.5% |
| Somchem S365 | <<locked>> | 94% | 62,076 psi | 89% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 59,698 psi | 86% | 2890 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 62,961 psi | 90% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 59,640 psi | 86% | 2710 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 59,712 psi | 86% | 2733 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 60,916 psi | 88% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 60,031 psi | 86% | 2854 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 59,321 psi | 85% | 2871 fps | 100% |
| Vihtavuori N540 | <<locked>> | 84% | 61,598 psi | 88% | 2779 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 62,975 psi | 90% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 61,046 psi | 88% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 61,612 psi | 89% | 3031 fps | 99.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,852 psi | 76% | 2890 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 46,050 psi | 66% | 2831 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 59,799 psi | 86% | 2812 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 61,917 psi | 89% | 2943 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,709 psi | 80% | 2995 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 62,642 psi | 90% | 2858 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 60,104 psi | 86% | 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 2495 | <<locked>> | 80% | 56,826 psi | 82% | 2684 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 54,244 psi | 78% | 2733 fps | 100% |
| Accurate 3100 | <<locked>> | 80% | 30,879 psi | 44% | 2385 fps | 98% |
| Accurate 4064 | <<locked>> | 80% | 53,983 psi | 78% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,076 psi | 60% | 2628 fps | 100% |
| Accurate MAGPRO | 100.3 gr | 86% | 39,262 psi | 56% | 2664 fps | 95.9% |
| ADI APS 450 | <<locked>> | 80% | 58,755 psi | 84% | 2136 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 50,691 psi | 73% | 2697 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,389 psi | 51% | 2516 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 36,056 psi | 52% | 2559 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 34,592 psi | 50% | 2520 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 88% | 27,035 psi | 39% | 2369 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 57,769 psi | 83% | 2920 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,665 psi | 51% | 2520 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,677 psi | 74% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 55,056 psi | 79% | 2785 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,698 psi | 58% | 2638 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,862 psi | 67% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,331 psi | 51% | 2513 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 31,154 psi | 45% | 2454 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,907 psi | 43% | 2421 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,078 psi | 37% | 2333 fps | 96.7% |
| Alliant Reloder-26 | 94.4 gr | 80% | 32,314 psi | 46% | 2552 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 46,949 psi | 67% | 2707 fps | 95.7% |
| Bofors RP15 | <<locked>> | 82% | 30,966 psi | 44% | 2451 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 52,272 psi | 75% | 2730 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 32,953 psi | 47% | 2536 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 31,154 psi | 45% | 2454 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 45,498 psi | 65% | 2635 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 32,982 psi | 47% | 2484 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 52,431 psi | 75% | 2753 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,063 psi | 63% | 2680 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 46,905 psi | 67% | 2694 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 36,013 psi | 52% | 2510 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 37,840 psi | 54% | 2549 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,189 psi | 55% | 2523 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 57,609 psi | 83% | 2825 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 31,024 psi | 45% | 2523 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 43,337 psi | 62% | 2707 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 40% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 57,653 psi | 83% | 2785 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,316 psi | 77% | 2723 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 55,608 psi | 80% | 2766 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,060 psi | 59% | 2572 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,065 psi | 68% | 2661 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 40,205 psi | 58% | 2579 fps | 100% |
| IMR 4895 | <<locked>> | 80% | 56,492 psi | 81% | 2812 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 35,534 psi | 51% | 2461 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 34,548 psi | 50% | 2536 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 33,170 psi | 48% | 2559 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 57,885 psi | 83% | 2746 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 53,577 psi | 77% | 2713 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,382 psi | 64% | 2608 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 42,685 psi | 61% | 2602 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 26,455 psi | 38% | 2270 fps | 96.3% |
| Norma 201 | <<locked>> | 80% | 58,088 psi | 83% | 2766 fps | 100% |
| Norma 202 | <<locked>> | 80% | 59,088 psi | 85% | 2756 fps | 100% |
| Norma 203B | <<locked>> | 80% | 54,375 psi | 78% | 2772 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,843 psi | 59% | 2612 fps | 98.2% |
| Norma 217 | <<locked>> | 94% | 28,906 psi | 42% | 2467 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 32,401 psi | 47% | 2520 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 41,713 psi | 60% | 2621 fps | 100% |
| Ramshot Big Game | <<locked>> | 80% | 55,274 psi | 79% | 2799 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 33,895 psi | 49% | 2536 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 40,538 psi | 58% | 2621 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 84% | 29,979 psi | 43% | 2421 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 40% | 1588 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,228 psi | 75% | 2743 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,777 psi | 72% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,061 psi | 60% | 2651 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,480 psi | 58% | 2671 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 27,963 psi | 40% | 2431 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 38,392 psi | 55% | 2697 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 55,405 psi | 80% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 49,211 psi | 71% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 36,854 psi | 53% | 2497 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 34,461 psi | 50% | 2493 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 80% | 45,498 psi | 65% | 2635 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,382 psi | 64% | 2608 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 53,577 psi | 77% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,685 psi | 61% | 2602 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,705 psi | 73% | 2743 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 58,233 psi | 84% | 2802 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 58,537 psi | 84% | 2680 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,821 psi | 72% | 2562 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,395 psi | 62% | 2559 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 34,142 psi | 49% | 2490 fps | 96.7% |
| Somchem S335 | <<locked>> | 80% | 58,363 psi | 84% | 2680 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 49,211 psi | 71% | 2680 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 37,304 psi | 54% | 2484 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 38,348 psi | 55% | 2575 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,070 psi | 50% | 2480 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 80% | 59,219 psi | 85% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 55,985 psi | 80% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 56,173 psi | 81% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 47,152 psi | 68% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,091 psi | 62% | 2612 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 30,211 psi | 43% | 2359 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 54,215 psi | 78% | 2690 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,409 psi | 61% | 2618 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 33,431 psi | 48% | 2490 fps | 99.8% |
| Vihtavuori N560 | 93.9 gr | 82% | 35,201 psi | 51% | 2566 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 34,809 psi | 50% | 2556 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 96% | 39,958 psi | 57% | 2710 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,148 psi | 61% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,222 psi | 64% | 2684 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,368 psi | 38% | 2438 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 80% | 58,595 psi | 84% | 2808 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 31,879 psi | 46% | 2405 fps | 95.7% |
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 109 powders for 37 XC loaded with the .376 | 300gr | Peregrine Brass Backup (VRG-1). Vihtavuori N560 delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,732 fps to 3,031 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (480 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.376" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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, Vihtavuori N560, Accurate MAGPRO rank at the top here: for 37 XC with the .376 | 300gr | Peregrine Brass Backup (VRG-1) 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.