Load Specifications
Bullet:.375 | 200gr | MAKER TREX
Bullet Manufacturer:MAKER
Bullet Weight:200 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Rem. Ultra Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:117 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:6.0
Load data in caliber .375 Rem. Ultra Mag. with .375 | 200gr | MAKER TREX bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and ReloadSwiss RS 52.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 56,043 psi | 88% | 2963 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,549 psi | 85% | 2982 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 57,392 psi | 90% | 3018 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,652 psi | 89% | 3041 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 57,334 psi | 90% | 3061 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,879 psi | 78% | 3009 fps | 97.9% |
| Accurate LT-30 | <<locked>> | 82% | 55,201 psi | 87% | 2910 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,579 psi | 87% | 2936 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,419 psi | 87% | 3051 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 96% | 56,536 psi | 89% | 3045 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 82% | 56,420 psi | 88% | 3031 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,549 psi | 85% | 3005 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 88% | 54,578 psi | 86% | 2992 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,941 psi | 88% | 3120 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,230 psi | 87% | 3159 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,086 psi | 88% | 3064 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,535 psi | 87% | 2972 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 56,913 psi | 89% | 3091 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 3018 fps | 98% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 3182 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,781 psi | 86% | 2897 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,448 psi | 87% | 3058 fps | 98.8% |
| Bofors RP3 | <<locked>> | 96% | 56,608 psi | 89% | 3077 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3035 fps | 95.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,492 psi | 89% | 2995 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 57,537 psi | 90% | 3084 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,622 psi | 87% | 3127 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 84% | 55,042 psi | 86% | 3012 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,391 psi | 88% | 3035 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,404 psi | 85% | 3035 fps | 98.1% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3064 fps | 96% |
| Hodgdon H4895 | <<locked>> | 90% | 55,927 psi | 88% | 3064 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,875 psi | 70% | 2890 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,071 psi | 86% | 3087 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,635 psi | 54% | 1896 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,522 psi | 90% | 3068 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 55,274 psi | 87% | 3054 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,825 psi | 87% | 3028 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,492 psi | 89% | 3005 fps | 96.3% |
| IMR 4198 | <<locked>> | 84% | 55,811 psi | 87% | 2940 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,840 psi | 88% | 3018 fps | 96.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,529 psi | 74% | 2946 fps | 97.5% |
| IMR 4895 | <<locked>> | 92% | 54,650 psi | 86% | 3068 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 88% | 54,549 psi | 85% | 3005 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 84% | 54,549 psi | 85% | 2989 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,781 psi | 86% | 3025 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,347 psi | 87% | 2982 fps | 99.4% |
| Lovex S062 | <<locked>> | 94% | 55,245 psi | 87% | 3022 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 3009 fps | 97.4% |
| Norma 201 | <<locked>> | 92% | 57,464 psi | 90% | 3048 fps | 100% |
| Norma 202 | <<locked>> | 90% | 54,476 psi | 85% | 3005 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,999 psi | 88% | 3074 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 49,603 psi | 78% | 3005 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 94% | 56,855 psi | 89% | 3094 fps | 99.5% |
| Ramshot TAC | <<locked>> | 88% | 55,274 psi | 87% | 3012 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,578 psi | 86% | 3035 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,898 psi | 88% | 3005 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,882 psi | 55% | 1942 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,114 psi | 85% | 2992 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,984 psi | 86% | 3012 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 57,261 psi | 90% | 3156 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 57,290 psi | 90% | 3192 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,806 psi | 78% | 3025 fps | 97.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,763 psi | 80% | 3054 fps | 97.2% |
| Rottweil R 901 | <<locked>> | 88% | 54,462 psi | 85% | 2986 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,172 psi | 85% | 2989 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 98% | 56,246 psi | 88% | 3064 fps | 99.8% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3035 fps | 95.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,694 psi | 86% | 3009 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,781 psi | 86% | 3025 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,245 psi | 87% | 3022 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 57,725 psi | 90% | 3015 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,855 psi | 89% | 3038 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,868 psi | 86% | 3074 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,695 psi | 89% | 2999 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 57,261 psi | 90% | 3045 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 57,624 psi | 90% | 3071 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,782 psi | 87% | 2946 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,941 psi | 88% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,521 psi | 87% | 2956 fps | 96.1% |
| Somchem S321 | <<locked>> | 86% | 56,014 psi | 88% | 3041 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,955 psi | 86% | 2940 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,608 psi | 89% | 3035 fps | 99.5% |
| Somchem S355 | <<locked>> | 98% | 56,724 psi | 89% | 3064 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,092 psi | 69% | 2946 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 86% | 55,550 psi | 87% | 2920 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,825 psi | 87% | 2933 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 57,101 psi | 89% | 3009 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,056 psi | 86% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,940 psi | 86% | 2995 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,228 psi | 82% | 3005 fps | 98.1% |
| Vihtavuori N530 | <<locked>> | 88% | 55,158 psi | 86% | 3009 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 57,043 psi | 89% | 3022 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3009 fps | 97.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,592 psi | 84% | 2989 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 54,795 psi | 86% | 3054 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,867 psi | 84% | 3068 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 92% | 57,580 psi | 90% | 3081 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 43,178 psi | 68% | 2766 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,384 psi | 74% | 2871 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,418 psi | 56% | 2657 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,525 psi | 67% | 2815 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 33,504 psi | 53% | 2638 fps | 98.6% |
| Accurate 4350 | <<locked>> | 94% | 40,118 psi | 63% | 2825 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 51,851 psi | 81% | 2861 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,228 psi | 82% | 2887 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,842 psi | 62% | 2766 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 38,638 psi | 61% | 2717 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 52,750 psi | 83% | 2979 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,959 psi | 66% | 2785 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 80% | 41,350 psi | 65% | 2795 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,776 psi | 76% | 2999 fps | 99% |
| Alliant Power Pro 2000-MR | 82.6 gr | 82% | 38,812 psi | 61% | 2831 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,025 psi | 52% | 2621 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,863 psi | 77% | 2877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 38,159 psi | 60% | 2743 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 40,364 psi | 63% | 2838 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,230 psi | 55% | 2743 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,343 psi | 80% | 2848 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,131 psi | 61% | 2759 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 32,242 psi | 51% | 2612 fps | 95.1% |
| Bofors RP7 | <<locked>> | 98% | 53,664 psi | 84% | 2979 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,976 psi | 69% | 2789 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,364 psi | 63% | 2792 fps | 98.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,498 psi | 70% | 2936 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 80% | 48,037 psi | 75% | 2904 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,095 psi | 77% | 2923 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 41,307 psi | 65% | 2795 fps | 95% |
| Hodgdon H414 | <<locked>> | 98% | 49,951 psi | 78% | 3002 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 40,161 psi | 63% | 2779 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,476 psi | 54% | 2664 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,201 psi | 57% | 2733 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,585 psi | 40% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,783 psi | 61% | 2733 fps | 96.8% |
| IMR 3031 | <<locked>> | 80% | 39,291 psi | 62% | 2792 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 37,869 psi | 59% | 2697 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 52,953 psi | 83% | 2946 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 49,458 psi | 78% | 2848 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 52,518 psi | 82% | 2966 fps | 95.4% |
| IMR 4831 | <<locked>> | 94% | 38,667 psi | 61% | 2776 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 36,492 psi | 57% | 2720 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 41,959 psi | 66% | 2785 fps | 98.3% |
| Lovex D073.5 | <<locked>> | 80% | 47,239 psi | 74% | 2874 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 38,363 psi | 60% | 2743 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 40,466 psi | 63% | 2713 fps | 96.8% |
| Lovex S062 | <<locked>> | 80% | 35,172 psi | 55% | 2648 fps | 96.6% |
| Lovex S065 | <<locked>> | 94% | 45,107 psi | 71% | 2841 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 38,928 psi | 61% | 2723 fps | 97.7% |
| Norma 202 | <<locked>> | 80% | 39,175 psi | 61% | 2740 fps | 99.4% |
| Norma 203B | <<locked>> | 80% | 35,041 psi | 55% | 2674 fps | 95% |
| Norma URP | <<locked>> | 94% | 40,495 psi | 63% | 2828 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 82% | 37,275 psi | 58% | 2740 fps | 95.6% |
| Ramshot TAC | <<locked>> | 82% | 45,092 psi | 71% | 2835 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,263 psi | 65% | 2795 fps | 97% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,629 psi | 72% | 2835 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,773 psi | 40% | 1742 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,253 psi | 74% | 2884 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 48,066 psi | 75% | 2894 fps | 95.1% |
| ReloadSwiss RS 52 | 80 gr | 82% | 39,769 psi | 62% | 2844 fps | 95.9% |
| ReloadSwiss RS 60 | 79.3 gr | 80% | 30,487 psi | 48% | 2625 fps | 95.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 40,161 psi | 63% | 2841 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 44,048 psi | 69% | 2920 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 42,424 psi | 66% | 2779 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 36,898 psi | 58% | 2671 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 84% | 34,795 psi | 55% | 2667 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 98% | 53,664 psi | 84% | 2979 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 45,107 psi | 71% | 2841 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,363 psi | 60% | 2743 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 35,172 psi | 55% | 2648 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,009 psi | 78% | 2897 fps | 99.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 53,127 psi | 83% | 2986 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 36,376 psi | 57% | 2726 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,792 psi | 78% | 2900 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 43,004 psi | 67% | 2802 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,551 psi | 60% | 2730 fps | 96.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,538 psi | 64% | 2697 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,359 psi | 52% | 2546 fps | 99.1% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 51,779 psi | 81% | 2900 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 45,411 psi | 71% | 2867 fps | 99.1% |
| Somchem S335 | <<locked>> | 80% | 40,132 psi | 63% | 2697 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 39,856 psi | 62% | 2743 fps | 96.5% |
| Somchem S355 | <<locked>> | 82% | 33,562 psi | 53% | 2625 fps | 95% |
| Somchem S365 | <<locked>> | 90% | 31,430 psi | 49% | 2648 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 46,021 psi | 72% | 2779 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,770 psi | 64% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,998 psi | 56% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,043 psi | 58% | 2671 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 29,834 psi | 47% | 2507 fps | 95.1% |
| Vihtavuori N160 | <<locked>> | 92% | 39,827 psi | 62% | 2776 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 41,887 psi | 66% | 2779 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 80% | 35,723 psi | 56% | 2651 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 94% | 41,872 psi | 66% | 2831 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,360 psi | 55% | 2641 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 41,292 psi | 65% | 2822 fps | 98.9% |
| Winchester 760 | <<locked>> | 98% | 50,140 psi | 79% | 3005 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,782 psi | 59% | 2730 fps | 96.7% |
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 98 powders for .375 Rem. Ultra Mag. loaded with the .375 | 200gr | MAKER TREX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,192 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,192 fps. Accurate 4350 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 Power Pro 2000-MR, ReloadSwiss RS 60, ReloadSwiss RS 52 rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 200gr | MAKER TREX 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.