Load Specifications
Bullet:.375 | 270gr | Swift A-Frame
Bullet Manufacturer:Swift
Bullet Weight:270 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 | 270gr | Swift A-Frame 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 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% | 60,510 psi | 87% | 2877 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 61,264 psi | 88% | 2979 fps | 100% |
| Accurate 3100ᴾ | <<locked>> | 100% | 61,076 psi | 88% | 3038 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 60,945 psi | 88% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 58,842 psi | 85% | 3025 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 59,625 psi | 86% | 3159 fps | 99.1% |
| ADI APS 450 | <<locked>> | 84% | 62,845 psi | 90% | 2323 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 62,801 psi | 90% | 3025 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 60,307 psi | 87% | 2982 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 59,640 psi | 86% | 3087 fps | 99.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 61,221 psi | 88% | 3153 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,730 psi | 64% | 2867 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,595 psi | 57% | 2831 fps | 99.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 61,090 psi | 88% | 3123 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 59,741 psi | 86% | 3084 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 61,670 psi | 89% | 3002 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 61,772 psi | 89% | 3031 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 59,408 psi | 85% | 3081 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 61,322 psi | 88% | 3100 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 62,845 psi | 90% | 3130 fps | 100% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 60,669 psi | 87% | 3143 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,638 psi | 83% | 3048 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,864 psi | 72% | 3009 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 62,946 psi | 90% | 3209 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 59,451 psi | 85% | 3048 fps | 97.5% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,724 psi | 80% | 3071 fps | 99.8% |
| Bofors RP3 | <<locked>> | 84% | 59,176 psi | 85% | 2976 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,745 psi | 66% | 2943 fps | 98.4% |
| Bofors RP5ᴾ | <<locked>> | 100% | 60,669 psi | 87% | 3143 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 61,772 psi | 89% | 3028 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,182 psi | 71% | 2953 fps | 99% |
| Hodgdon H380 | <<locked>> | 84% | 59,263 psi | 85% | 2999 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 60,771 psi | 87% | 3087 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 59,857 psi | 86% | 3041 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 98% | 61,467 psi | 88% | 3087 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 60,017 psi | 86% | 3068 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 59,857 psi | 86% | 2989 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 60,785 psi | 87% | 3022 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,762 psi | 70% | 3071 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 61,728 psi | 89% | 3130 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 53% | 1841 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 60,713 psi | 87% | 2979 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 59,814 psi | 86% | 2963 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 62,410 psi | 90% | 3012 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 59,335 psi | 85% | 3012 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 88% | 59,567 psi | 86% | 2999 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 62,932 psi | 90% | 3061 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 59,524 psi | 86% | 3009 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 62,279 psi | 89% | 3064 fps | 99.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 58,682 psi | 84% | 3130 fps | 99.6% |
| Lovex S060 | <<locked>> | 82% | 60,916 psi | 88% | 2940 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 60,176 psi | 86% | 2953 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 60,031 psi | 86% | 2992 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 61,772 psi | 89% | 3041 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,865 psi | 73% | 2900 fps | 100% |
| Norma 201 | <<locked>> | 82% | 61,409 psi | 88% | 2963 fps | 100% |
| Norma 202 | <<locked>> | 82% | 62,236 psi | 89% | 2949 fps | 100% |
| Norma 203B | <<locked>> | 84% | 61,046 psi | 88% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 92% | 60,785 psi | 87% | 3077 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 35,143 psi | 50% | 2756 fps | 97.5% |
| Norma MRP | <<locked>> | 98% | 60,727 psi | 87% | 3169 fps | 100% |
| Norma URP | <<locked>> | 92% | 61,032 psi | 88% | 3061 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 62,482 psi | 90% | 3045 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 59,625 psi | 86% | 3150 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 92% | 59,857 psi | 86% | 3074 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,577 psi | 77% | 3018 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 54% | 1886 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 62,903 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 60,655 psi | 87% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 58,885 psi | 85% | 3054 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 61,351 psi | 88% | 3140 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,095 psi | 71% | 3068 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 44,063 psi | 63% | 2943 fps | 96.6% |
| Rottweil R 902 | <<locked>> | 84% | 62,178 psi | 89% | 2959 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 59,205 psi | 85% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 60,959 psi | 88% | 3051 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 98% | 62,294 psi | 89% | 3117 fps | 100% |
| Rottweil R 907 | <<locked>> | 90% | 61,772 psi | 89% | 3028 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 90% | 60,031 psi | 86% | 2992 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 60,176 psi | 86% | 2953 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 61,772 psi | 89% | 3041 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 60,916 psi | 88% | 3031 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 61,308 psi | 88% | 2999 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 61,699 psi | 89% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 59,321 psi | 85% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 59,538 psi | 86% | 2946 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 61,786 psi | 89% | 3110 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 61,525 psi | 88% | 2871 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 62,584 psi | 90% | 3012 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 59,030 psi | 85% | 2989 fps | 99% |
| Somchem S365 | <<locked>> | 94% | 61,090 psi | 88% | 3054 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 62,888 psi | 90% | 3081 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 62,265 psi | 89% | 2848 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 62,874 psi | 90% | 2904 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 62,946 psi | 90% | 2923 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 60,307 psi | 87% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 59,190 psi | 85% | 2995 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 58,407 psi | 84% | 3005 fps | 100% |
| Vihtavuori N540 | <<locked>> | 84% | 60,974 psi | 88% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 62,149 psi | 89% | 3058 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 60,162 psi | 86% | 3074 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 60,669 psi | 87% | 3169 fps | 99.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,199 psi | 75% | 3025 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 45,498 psi | 65% | 2953 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 59,001 psi | 85% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 60,945 psi | 88% | 3087 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,302 psi | 78% | 3136 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 61,786 psi | 89% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 59,321 psi | 85% | 3031 fps | 99.9% |
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% | 56,666 psi | 81% | 2831 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 53,708 psi | 77% | 2871 fps | 99.8% |
| Accurate 3100 | <<locked>> | 80% | 30,966 psi | 44% | 2507 fps | 97.2% |
| Accurate 4064 | <<locked>> | 80% | 53,795 psi | 77% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,829 psi | 60% | 2762 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 41,800 psi | 60% | 2848 fps | 95.6% |
| ADI APS 450 | <<locked>> | 80% | 58,784 psi | 84% | 2267 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 59,001 psi | 85% | 2976 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 50,154 psi | 72% | 2838 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,128 psi | 50% | 2631 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 38,276 psi | 55% | 2736 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 96% | 39,146 psi | 56% | 2746 fps | 96% |
| ADI AR 2225 | <<locked>> | 92% | 30,719 psi | 44% | 2592 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 56,753 psi | 82% | 3068 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,389 psi | 51% | 2638 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,111 psi | 73% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,447 psi | 78% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,219 psi | 58% | 2769 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,122 psi | 66% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,070 psi | 50% | 2631 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 33,098 psi | 48% | 2628 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,791 psi | 43% | 2539 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,150 psi | 38% | 2441 fps | 95.4% |
| Alliant Reloder-26 | 98.8 gr | 80% | 32,126 psi | 46% | 2671 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 49,472 psi | 71% | 2881 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 32,982 psi | 47% | 2621 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 51,808 psi | 74% | 2874 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 34,998 psi | 50% | 2707 fps | 95.2% |
| Bofors RP5 | <<locked>> | 82% | 33,098 psi | 48% | 2628 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 45,121 psi | 65% | 2766 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 35,114 psi | 50% | 2651 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 51,953 psi | 75% | 2894 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,555 psi | 63% | 2808 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 46,296 psi | 67% | 2822 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 40,799 psi | 59% | 2740 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 40,132 psi | 58% | 2726 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,855 psi | 54% | 2651 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 56,855 psi | 82% | 2972 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 33,025 psi | 47% | 2697 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 42,685 psi | 61% | 2831 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,543 psi | 40% | 1647 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 57,000 psi | 82% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,779 psi | 76% | 2864 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,926 psi | 79% | 2904 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,698 psi | 58% | 2697 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,499 psi | 67% | 2792 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 39,972 psi | 57% | 2710 fps | 99.9% |
| IMR 4895 | <<locked>> | 80% | 55,854 psi | 80% | 2956 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 40,161 psi | 58% | 2687 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 88% | 39,233 psi | 56% | 2772 fps | 95.9% |
| Lovex S060 | <<locked>> | 80% | 57,261 psi | 82% | 2890 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 53,171 psi | 76% | 2858 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,077 psi | 63% | 2743 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 42,366 psi | 61% | 2730 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 26,658 psi | 38% | 2385 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 57,653 psi | 83% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 80% | 58,421 psi | 84% | 2904 fps | 100% |
| Norma 203B | <<locked>> | 80% | 53,780 psi | 77% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,364 psi | 58% | 2733 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 30,806 psi | 44% | 2638 fps | 95.6% |
| Norma MRP | 95.9 gr | 80% | 32,227 psi | 46% | 2635 fps | 96.5% |
| Norma URP | <<locked>> | 80% | 41,234 psi | 59% | 2749 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 80% | 54,607 psi | 78% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 36,172 psi | 52% | 2710 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 40,089 psi | 58% | 2746 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 86% | 32,126 psi | 46% | 2592 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,123 psi | 40% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,750 psi | 74% | 2877 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,936 psi | 70% | 2927 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,626 psi | 60% | 2782 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,074 psi | 58% | 2799 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 29,994 psi | 43% | 2602 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 40,944 psi | 59% | 2874 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 54,926 psi | 79% | 2867 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,776 psi | 70% | 2822 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 39,015 psi | 56% | 2671 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 34,214 psi | 49% | 2612 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,121 psi | 65% | 2766 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,077 psi | 63% | 2743 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 53,171 psi | 76% | 2858 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,366 psi | 61% | 2730 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,024 psi | 72% | 2881 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 57,493 psi | 83% | 2946 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 57,986 psi | 83% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,400 psi | 71% | 2700 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,134 psi | 62% | 2687 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,910 psi | 49% | 2608 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 57,856 psi | 83% | 2825 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 48,791 psi | 70% | 2818 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 39,740 psi | 57% | 2657 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 37,942 psi | 55% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,838 psi | 50% | 2598 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 80% | 58,653 psi | 84% | 2805 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 55,477 psi | 80% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 55,477 psi | 80% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 46,702 psi | 67% | 2743 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,670 psi | 61% | 2743 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 32,169 psi | 46% | 2526 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,722 psi | 77% | 2835 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,076 psi | 60% | 2749 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,257 psi | 48% | 2615 fps | 99.5% |
| Vihtavuori N560 | 103.1 gr | 86% | 40,059 psi | 58% | 2808 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 90% | 37,072 psi | 53% | 2730 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 42,467 psi | 61% | 2890 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,669 psi | 60% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,729 psi | 63% | 2812 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,397 psi | 38% | 2549 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 57,841 psi | 83% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 34,011 psi | 49% | 2575 fps | 95.4% |
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 .375 | 270gr | Swift A-Frame. Alliant Reloder-26 delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,209 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 50–90 %, 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. 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, Norma MRP rank at the top here: for 37 XC with the .375 | 270gr | Swift A-Frame 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.