Load Specifications
Bullet:.375 | 270gr | Brenneke TOG
Bullet Manufacturer:Brenneke
Bullet Weight:270 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:37XC 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 37XC with .375 | 270gr | Brenneke TOG bullet and 108 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% | 60,104 psi | 86% | 2874 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 60,959 psi | 88% | 2972 fps | 100% |
| Accurate 3100ᴾ | <<locked>> | 100% | 60,669 psi | 87% | 3031 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 60,742 psi | 87% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 62,598 psi | 90% | 3074 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 59,205 psi | 85% | 3150 fps | 99% |
| ADI APS 450 | <<locked>> | 84% | 62,845 psi | 90% | 2320 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 62,613 psi | 90% | 3022 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 59,973 psi | 86% | 2979 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 59,146 psi | 85% | 3081 fps | 99.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 60,959 psi | 88% | 3146 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,411 psi | 64% | 2858 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,291 psi | 56% | 2822 fps | 99.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 60,684 psi | 87% | 3117 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 61,293 psi | 88% | 2999 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 61,438 psi | 88% | 3025 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 59,045 psi | 85% | 3074 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 60,800 psi | 87% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 62,381 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 60,350 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,130 psi | 82% | 3041 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,458 psi | 71% | 3002 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 62,424 psi | 90% | 3202 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 59,117 psi | 85% | 3041 fps | 97.4% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,274 psi | 79% | 3064 fps | 99.7% |
| Bofors RP3 | <<locked>> | 86% | 62,801 psi | 90% | 3018 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,368 psi | 65% | 2936 fps | 98.3% |
| Bofors RP5ᴾ | <<locked>> | 100% | 60,350 psi | 87% | 3136 fps | 100% |
| Bofors RP7 | <<locked>> | 90% | 61,453 psi | 88% | 3022 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,820 psi | 70% | 2946 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 62,975 psi | 90% | 3045 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 60,408 psi | 87% | 3081 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 59,553 psi | 86% | 3035 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 98% | 61,032 psi | 88% | 3081 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 59,640 psi | 86% | 3061 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 59,538 psi | 86% | 2986 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 60,408 psi | 87% | 3018 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,385 psi | 70% | 3061 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 61,482 psi | 88% | 3127 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 53% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 60,336 psi | 87% | 2976 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 59,422 psi | 85% | 2956 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 62,105 psi | 89% | 3005 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 62,888 psi | 90% | 3054 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 88% | 59,263 psi | 85% | 2992 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 62,642 psi | 90% | 3054 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 59,321 psi | 85% | 3002 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 61,902 psi | 89% | 3058 fps | 99.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 58,247 psi | 84% | 3120 fps | 99.5% |
| Lovex S060 | <<locked>> | 82% | 60,582 psi | 87% | 2933 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 59,785 psi | 86% | 2946 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 59,727 psi | 86% | 2986 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 61,279 psi | 88% | 3035 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,401 psi | 72% | 2890 fps | 100% |
| Norma 201 | <<locked>> | 82% | 60,988 psi | 88% | 2953 fps | 100% |
| Norma 202 | <<locked>> | 82% | 61,815 psi | 89% | 2943 fps | 100% |
| Norma 203B | <<locked>> | 84% | 60,713 psi | 87% | 3009 fps | 100% |
| Norma 204 | <<locked>> | 92% | 60,365 psi | 87% | 3071 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 34,809 psi | 50% | 2746 fps | 97.4% |
| Norma MRP | <<locked>> | 98% | 60,263 psi | 87% | 3163 fps | 100% |
| Norma URP | <<locked>> | 92% | 60,510 psi | 87% | 3054 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 62,149 psi | 89% | 3038 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 59,190 psi | 85% | 3140 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 92% | 59,393 psi | 85% | 3064 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,011 psi | 76% | 3009 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,478 psi | 54% | 1883 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 62,613 psi | 90% | 3031 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 60,220 psi | 87% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 62,511 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 60,843 psi | 87% | 3133 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,747 psi | 70% | 3058 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 43,758 psi | 63% | 2933 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 84% | 61,801 psi | 89% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 62,772 psi | 90% | 3012 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 60,655 psi | 87% | 3045 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 98% | 62,004 psi | 89% | 3110 fps | 100% |
| Rottweil R 907 | <<locked>> | 90% | 61,453 psi | 88% | 3022 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 90% | 59,727 psi | 86% | 2986 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 59,785 psi | 86% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 61,279 psi | 88% | 3035 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 60,524 psi | 87% | 3025 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 60,988 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 61,482 psi | 88% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 62,729 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 59,263 psi | 85% | 2940 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 61,511 psi | 88% | 3107 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 61,163 psi | 88% | 2864 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 62,221 psi | 89% | 3005 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 62,830 psi | 90% | 3038 fps | 99.3% |
| Somchem S365 | <<locked>> | 94% | 60,727 psi | 87% | 3048 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 62,424 psi | 90% | 3074 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 62,062 psi | 89% | 2841 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 62,410 psi | 90% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 62,598 psi | 90% | 2917 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 59,973 psi | 86% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 62,787 psi | 90% | 3038 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,986 psi | 83% | 2999 fps | 100% |
| Vihtavuori N540 | <<locked>> | 84% | 60,640 psi | 87% | 2923 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 61,873 psi | 89% | 3051 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 59,625 psi | 86% | 3068 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 60,191 psi | 86% | 3163 fps | 99.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,793 psi | 74% | 3015 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 45,179 psi | 65% | 2946 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 62,758 psi | 90% | 2995 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 60,611 psi | 87% | 3084 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,809 psi | 77% | 3130 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 61,424 psi | 88% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 58,885 psi | 85% | 3022 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% | 56,434 psi | 81% | 2828 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 53,432 psi | 77% | 2864 fps | 99.7% |
| Accurate 3100 | <<locked>> | 80% | 30,763 psi | 44% | 2500 fps | 97% |
| Accurate 4064 | <<locked>> | 80% | 53,534 psi | 77% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,582 psi | 60% | 2756 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 41,423 psi | 60% | 2838 fps | 95.5% |
| ADI APS 450 | <<locked>> | 80% | 58,755 psi | 84% | 2264 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 58,784 psi | 84% | 2969 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 49,966 psi | 72% | 2831 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 34,954 psi | 50% | 2628 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 86% | 38,029 psi | 55% | 2730 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 38,856 psi | 56% | 2736 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 92% | 30,458 psi | 44% | 2582 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 56,347 psi | 81% | 3061 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,879 psi | 73% | 2854 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,259 psi | 78% | 2927 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,001 psi | 57% | 2766 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,774 psi | 66% | 2881 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,896 psi | 50% | 2628 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 32,938 psi | 47% | 2621 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,617 psi | 43% | 2536 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,005 psi | 37% | 2434 fps | 95.2% |
| Alliant Reloder-26 | 98.2 gr | 80% | 31,865 psi | 46% | 2664 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 49,168 psi | 71% | 2874 fps | 95.2% |
| Bofors RP15 | <<locked>> | 86% | 34,983 psi | 50% | 2674 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 51,576 psi | 74% | 2871 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 34,751 psi | 50% | 2703 fps | 95.1% |
| Bofors RP5 | <<locked>> | 82% | 32,938 psi | 47% | 2621 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 44,933 psi | 65% | 2759 fps | 99% |
| Hodgdon H1000 | <<locked>> | 92% | 37,289 psi | 54% | 2707 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 51,750 psi | 74% | 2890 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,381 psi | 62% | 2805 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 46,093 psi | 66% | 2818 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 40,538 psi | 58% | 2733 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 39,871 psi | 57% | 2720 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,623 psi | 54% | 2648 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 56,521 psi | 81% | 2966 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 32,822 psi | 47% | 2687 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 42,380 psi | 61% | 2825 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,514 psi | 40% | 1647 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 56,782 psi | 82% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,533 psi | 75% | 2861 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,781 psi | 79% | 2900 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,524 psi | 58% | 2690 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,296 psi | 67% | 2785 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 39,755 psi | 57% | 2703 fps | 99.9% |
| IMR 4895 | <<locked>> | 80% | 55,637 psi | 80% | 2953 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 39,885 psi | 57% | 2680 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 88% | 38,870 psi | 56% | 2762 fps | 95.7% |
| Lovex S060 | <<locked>> | 80% | 57,058 psi | 82% | 2887 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 52,910 psi | 76% | 2854 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,874 psi | 63% | 2736 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 42,192 psi | 61% | 2726 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 26,469 psi | 38% | 2379 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 57,392 psi | 82% | 2907 fps | 100% |
| Norma 202 | <<locked>> | 80% | 58,160 psi | 84% | 2897 fps | 100% |
| Norma 203B | <<locked>> | 80% | 53,592 psi | 77% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,103 psi | 58% | 2726 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 30,603 psi | 44% | 2628 fps | 95.5% |
| Norma MRP | 95.3 gr | 80% | 31,995 psi | 46% | 2628 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 41,031 psi | 59% | 2746 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 80% | 54,259 psi | 78% | 2936 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 38,450 psi | 55% | 2766 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 39,755 psi | 57% | 2740 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 31,908 psi | 46% | 2585 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 40% | 1686 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,430 psi | 74% | 2874 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,588 psi | 70% | 2923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,336 psi | 59% | 2776 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,769 psi | 57% | 2792 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 29,791 psi | 43% | 2595 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 40,625 psi | 58% | 2867 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 54,694 psi | 79% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,559 psi | 70% | 2818 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 38,725 psi | 56% | 2664 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 34,011 psi | 49% | 2608 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 44,933 psi | 65% | 2759 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,874 psi | 63% | 2736 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 52,910 psi | 76% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,192 psi | 61% | 2726 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,719 psi | 71% | 2874 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 57,130 psi | 82% | 2940 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 57,783 psi | 83% | 2825 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,153 psi | 71% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,975 psi | 62% | 2684 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,721 psi | 48% | 2602 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 57,667 psi | 83% | 2822 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 48,602 psi | 70% | 2815 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 39,508 psi | 57% | 2651 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 37,724 psi | 54% | 2700 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,679 psi | 50% | 2592 fps | 96.7% |
| Vihtavuori N133 | <<locked>> | 80% | 58,378 psi | 84% | 2799 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 55,230 psi | 79% | 2812 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 55,288 psi | 79% | 2828 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 46,485 psi | 67% | 2740 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,453 psi | 61% | 2736 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 31,995 psi | 46% | 2520 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 53,519 psi | 77% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,887 psi | 60% | 2746 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,054 psi | 47% | 2608 fps | 99.4% |
| Vihtavuori N560 | 102.5 gr | 86% | 39,798 psi | 57% | 2799 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 90% | 36,811 psi | 53% | 2723 fps | 95% |
| Vihtavuori N568 | <<locked>> | 98% | 42,134 psi | 61% | 2881 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,394 psi | 59% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,497 psi | 62% | 2808 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,150 psi | 38% | 2543 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 57,537 psi | 83% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 33,794 psi | 49% | 2569 fps | 95.3% |
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 113 powders for 37XC loaded with the .375 | 270gr | Brenneke TOG. Alliant Reloder-26 delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,202 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 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 37XC with the .375 | 270gr | Brenneke TOG they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, IMR 8133 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.