Load Specifications
Bullet:.375 | 270gr | Atomic 29 HP
Bullet Manufacturer:Atomic 29
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:1:17.0
Load data in caliber 37 XC with .375 | 270gr | Atomic 29 HP bullet and 124 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Alliant Reloder-26 and Winchester 760.
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>> | 84% | 60,278 psi | 87% | 2874 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 62,033 psi | 89% | 2976 fps | 100% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,449 psi | 81% | 2972 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 60,684 psi | 87% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 62,787 psi | 90% | 3068 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 62,395 psi | 90% | 3202 fps | 99.8% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 59,364 psi | 85% | 3143 fps | 98.9% |
| ADI APS 450 | <<locked>> | 84% | 62,700 psi | 90% | 2300 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 59,640 psi | 86% | 2976 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 60,887 psi | 87% | 2979 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 59,712 psi | 86% | 3077 fps | 99.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,319 psi | 82% | 3084 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 41,466 psi | 60% | 2785 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,492 psi | 52% | 2746 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 61,888 psi | 89% | 2963 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 61,438 psi | 88% | 3123 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 59,799 psi | 86% | 3074 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 59,799 psi | 86% | 3074 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 61,960 psi | 89% | 2999 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 62,308 psi | 90% | 3028 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 59,466 psi | 85% | 3074 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 61,279 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 62,888 psi | 90% | 3117 fps | 100% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,405 psi | 81% | 3077 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,287 psi | 77% | 2989 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,108 psi | 66% | 2936 fps | 100% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 62,468 psi | 90% | 3199 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 60,075 psi | 86% | 3002 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 56,333 psi | 81% | 2982 fps | 96.5% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,547 psi | 74% | 3002 fps | 99.3% |
| Bofors RP3 | <<locked>> | 86% | 59,219 psi | 85% | 2969 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 41,887 psi | 60% | 2861 fps | 97.3% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,405 psi | 81% | 3077 fps | 99.8% |
| Bofors RP7 | <<locked>> | 92% | 62,134 psi | 89% | 3022 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 82% | 62,816 psi | 90% | 2930 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 62,540 psi | 90% | 2999 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,774 psi | 66% | 2877 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 86% | 59,553 psi | 86% | 2995 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 60,858 psi | 87% | 3077 fps | 100% |
| Hodgdon H4350 | <<locked>> | 90% | 60,365 psi | 87% | 3038 fps | 99.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 61,554 psi | 88% | 3077 fps | 99.1% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 60,234 psi | 87% | 3058 fps | 99% |
| Hodgdon H4895 | <<locked>> | 82% | 60,365 psi | 87% | 2982 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 59,872 psi | 86% | 2982 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 61,293 psi | 88% | 3022 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,136 psi | 65% | 2989 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 92% | 62,105 psi | 89% | 3127 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 52% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 61,540 psi | 88% | 2982 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 61,293 psi | 88% | 2946 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 60,365 psi | 87% | 2959 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 59,393 psi | 85% | 2956 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 59,654 psi | 86% | 3002 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 90% | 60,147 psi | 86% | 2995 fps | 100% |
| IMR 4831 | <<locked>> | 96% | 62,874 psi | 90% | 3054 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 60,017 psi | 86% | 3005 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 62,627 psi | 90% | 3058 fps | 99.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,650 psi | 79% | 3054 fps | 99% |
| IMR 8208 XBR | <<locked>> | 82% | 61,888 psi | 89% | 2963 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 60,336 psi | 87% | 2936 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 61,786 psi | 89% | 2940 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 60,495 psi | 87% | 2949 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 60,191 psi | 86% | 2986 fps | 100% |
| Lovex S070 | <<locked>> | 94% | 61,873 psi | 89% | 3035 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,659 psi | 67% | 2828 fps | 99.9% |
| Norma 201 | <<locked>> | 84% | 61,830 psi | 89% | 2959 fps | 100% |
| Norma 202 | <<locked>> | 84% | 62,830 psi | 90% | 2949 fps | 100% |
| Norma 203B | <<locked>> | 86% | 61,525 psi | 88% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 94% | 61,105 psi | 88% | 3071 fps | 99.8% |
| Norma MRPᴾ | <<locked>> | 100% | 60,365 psi | 87% | 3159 fps | 100% |
| Norma URP | <<locked>> | 94% | 61,032 psi | 88% | 3054 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 58,842 psi | 85% | 2992 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,347 psi | 80% | 3074 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 94% | 59,901 psi | 86% | 3064 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,182 psi | 71% | 2943 fps | 99.6% |
| Ramshot TAC | <<locked>> | 82% | 62,120 psi | 89% | 3005 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 82% | 62,656 psi | 90% | 3015 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 53% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 59,495 psi | 85% | 2982 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 59,944 psi | 86% | 3051 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 60,756 psi | 87% | 3081 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 62,975 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 61,496 psi | 88% | 3136 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,194 psi | 65% | 2982 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 62,062 psi | 89% | 2920 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 62,497 psi | 90% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 59,219 psi | 85% | 2963 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 61,337 psi | 88% | 3045 fps | 99.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 62,352 psi | 90% | 3107 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 62,134 psi | 89% | 3022 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 92% | 60,191 psi | 86% | 2986 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 60,336 psi | 87% | 2936 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 60,495 psi | 87% | 2949 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 61,873 psi | 89% | 3035 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 61,380 psi | 88% | 3031 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 61,351 psi | 88% | 2986 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 61,989 psi | 89% | 2995 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 62,453 psi | 90% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 60,002 psi | 86% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 60,075 psi | 86% | 2943 fps | 100% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 61,830 psi | 89% | 3100 fps | 100% |
| Somchem S335 | <<locked>> | 84% | 62,149 psi | 89% | 2871 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 61,061 psi | 88% | 2966 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 62,787 psi | 90% | 3005 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 59,437 psi | 85% | 2982 fps | 98.8% |
| Somchem S365 | <<locked>> | 96% | 60,713 psi | 87% | 3045 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 62,787 psi | 90% | 3071 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 59,480 psi | 85% | 2805 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 59,292 psi | 85% | 2858 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 59,712 psi | 86% | 2877 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 60,640 psi | 87% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 59,364 psi | 85% | 2992 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,433 psi | 78% | 2940 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 62,627 psi | 90% | 2959 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 61,482 psi | 88% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 62,352 psi | 90% | 3051 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 59,538 psi | 86% | 3064 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 60,437 psi | 87% | 3156 fps | 99.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,950 psi | 69% | 2946 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 59,277 psi | 85% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 61,235 psi | 88% | 3084 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,008 psi | 70% | 3064 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 62,468 psi | 90% | 3005 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 59,292 psi | 85% | 3018 fps | 99.8% |
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% | 52,736 psi | 76% | 2779 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,807 psi | 73% | 2815 fps | 99.4% |
| Accurate 3100 | <<locked>> | 80% | 28,050 psi | 40% | 2428 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 50,038 psi | 72% | 2795 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,522 psi | 55% | 2694 fps | 99.7% |
| Accurate High Country | 99 gr | 86% | 37,811 psi | 54% | 2772 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 90% | 41,292 psi | 59% | 2831 fps | 95.2% |
| ADI APS 450 | <<locked>> | 80% | 58,465 psi | 84% | 2241 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 55,999 psi | 80% | 2927 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 47,543 psi | 68% | 2785 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 35,027 psi | 50% | 2625 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 90% | 40,785 psi | 59% | 2782 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 38,769 psi | 56% | 2726 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 94% | 30,095 psi | 43% | 2566 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 58,117 psi | 83% | 2913 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,127 psi | 76% | 3009 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 35,186 psi | 51% | 2625 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 35,186 psi | 51% | 2625 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,051 psi | 69% | 2805 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,401 psi | 74% | 2877 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,579 psi | 54% | 2710 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,830 psi | 62% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 34,853 psi | 50% | 2621 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 34,911 psi | 50% | 2671 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,267 psi | 39% | 2467 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 27,340 psi | 39% | 2480 fps | 95.8% |
| Alliant Reloder-26 | 94.9 gr | 80% | 29,254 psi | 42% | 2589 fps | 97.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 56,115 psi | 81% | 2946 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 49,777 psi | 72% | 2871 fps | 95% |
| Bofors RP15 | <<locked>> | 88% | 34,563 psi | 50% | 2657 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 48,356 psi | 69% | 2818 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 36,579 psi | 53% | 2743 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 34,911 psi | 50% | 2671 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 42,409 psi | 61% | 2703 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 59,059 psi | 85% | 2884 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 58,334 psi | 84% | 2946 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 37,217 psi | 53% | 2694 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,791 psi | 70% | 2838 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 40,640 psi | 58% | 2746 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 43,511 psi | 63% | 2762 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 40,756 psi | 59% | 2730 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 42,801 psi | 61% | 2772 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 56,637 psi | 81% | 2933 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,041 psi | 50% | 2592 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,534 psi | 77% | 2920 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 34,664 psi | 50% | 2736 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 39,624 psi | 57% | 2762 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 39% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,157 psi | 78% | 2884 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 57,537 psi | 83% | 2900 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,995 psi | 72% | 2815 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,199 psi | 75% | 2851 fps | 99.8% |
| IMR 4350 | <<locked>> | 80% | 38,145 psi | 55% | 2635 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,961 psi | 63% | 2736 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 36,985 psi | 53% | 2644 fps | 99.6% |
| IMR 4895 | <<locked>> | 80% | 52,750 psi | 76% | 2904 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 40,147 psi | 58% | 2677 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 38,856 psi | 56% | 2756 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 58,117 psi | 83% | 2913 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 56,347 psi | 81% | 2887 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 54,665 psi | 79% | 2844 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,169 psi | 72% | 2808 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,278 psi | 59% | 2680 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 39,537 psi | 57% | 2667 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 27,398 psi | 39% | 2411 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 54,404 psi | 78% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 80% | 55,274 psi | 79% | 2854 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,749 psi | 73% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 80% | 37,565 psi | 54% | 2664 fps | 96.1% |
| Norma MRP | <<locked>> | 82% | 31,720 psi | 46% | 2618 fps | 96% |
| Norma URP | <<locked>> | 80% | 38,319 psi | 55% | 2687 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 80% | 51,300 psi | 74% | 2887 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 38,334 psi | 55% | 2756 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 37,159 psi | 53% | 2680 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 31,618 psi | 45% | 2572 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 58,262 psi | 84% | 2956 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 80% | 58,523 psi | 84% | 2963 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,659 psi | 40% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,762 psi | 70% | 2822 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 55,883 psi | 80% | 2999 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,585 psi | 65% | 2874 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,392 psi | 55% | 2713 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,173 psi | 53% | 2730 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 31,517 psi | 45% | 2644 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 58,392 psi | 84% | 2874 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 51,851 psi | 74% | 2815 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,498 psi | 65% | 2766 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 38,943 psi | 56% | 2661 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 82% | 33,808 psi | 49% | 2598 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,409 psi | 61% | 2703 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,278 psi | 59% | 2680 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 56,347 psi | 81% | 2887 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 50,169 psi | 72% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,537 psi | 57% | 2667 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,876 psi | 67% | 2825 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 57,174 psi | 82% | 2933 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,375 psi | 78% | 2897 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 55,288 psi | 79% | 2785 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,818 psi | 67% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,480 psi | 58% | 2628 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 33,489 psi | 48% | 2595 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 54,897 psi | 79% | 2782 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 57,014 psi | 82% | 2913 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,716 psi | 66% | 2766 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 42,424 psi | 61% | 2703 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 34,809 psi | 50% | 2644 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 32,068 psi | 46% | 2526 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 55,927 psi | 80% | 2762 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 52,373 psi | 75% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,533 psi | 75% | 2789 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,787 psi | 63% | 2690 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,798 psi | 57% | 2684 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 86% | 33,924 psi | 49% | 2566 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 58,537 psi | 84% | 2910 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 50,749 psi | 73% | 2785 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,160 psi | 56% | 2687 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,182 psi | 43% | 2539 fps | 98.7% |
| Vihtavuori N560 | <<locked>> | 88% | 39,697 psi | 57% | 2792 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 94% | 38,798 psi | 56% | 2766 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,914 psi | 56% | 2648 fps | 100% |
| Winchester 760 | 90.7 gr | 80% | 40,756 psi | 59% | 2749 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,989 psi | 34% | 2454 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,694 psi | 79% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 33,678 psi | 48% | 2562 fps | 95% |
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 124 powders for 37 XC loaded with the .375 | 270gr | Atomic 29 HP. Accurate High Country delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,202 fps. Accurate 3100 gives the best case fill at 100 %, and 124 of the 124 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 270.0 gr projectile in 0.375" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Accurate MAGPRO 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 High Country, Alliant Reloder-26, Winchester 760 rank at the top here: for 37 XC with the .375 | 270gr | Atomic 29 HP 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.