Load Specifications
Load data in caliber .375 Weath. Mag. with .374 | 235gr | Rhino Penetrator bullet and 95 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 52 and ReloadSwiss RS 60.
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>> | 90% | 57,725 psi | 90% | 2795 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 56,362 psi | 88% | 2822 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 55,317 psi | 87% | 2808 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 54,230 psi | 85% | 2828 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 54,998 psi | 86% | 2851 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,978 psi | 74% | 2795 fps | 97.3% |
| Accurate LT-30 | <<locked>> | 84% | 57,217 psi | 90% | 2740 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,696 psi | 90% | 2766 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 56,710 psi | 89% | 2884 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 98% | 57,638 psi | 90% | 2877 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 82% | 54,462 psi | 85% | 2812 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,883 psi | 88% | 2838 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 55,854 psi | 88% | 2822 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 57,624 psi | 90% | 2946 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 56,246 psi | 88% | 2995 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,884 psi | 89% | 2897 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 57,479 psi | 90% | 2802 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 54,273 psi | 85% | 2867 fps | 99% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,630 psi | 73% | 2799 fps | 97.3% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 2956 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,536 psi | 89% | 2740 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 56,623 psi | 89% | 2897 fps | 98.9% |
| Bofors RP3 | <<locked>> | 98% | 57,537 psi | 90% | 2913 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,810 psi | 86% | 2782 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,926 psi | 86% | 2871 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 56,710 psi | 89% | 2963 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 86% | 56,869 psi | 89% | 2844 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 54,215 psi | 85% | 2818 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 55,434 psi | 87% | 2871 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 92% | 57,276 psi | 90% | 2897 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,815 psi | 67% | 2684 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 56,043 psi | 88% | 2927 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,679 psi | 54% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 55,129 psi | 86% | 2848 fps | 99.6% |
| IMR 3031 | <<locked>> | 92% | 56,492 psi | 89% | 2884 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 57,188 psi | 90% | 2861 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,404 psi | 85% | 2785 fps | 95.8% |
| IMR 4198 | <<locked>> | 86% | 57,725 psi | 90% | 2759 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,869 psi | 89% | 2854 fps | 96.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,991 psi | 71% | 2740 fps | 96.9% |
| IMR 4895 | <<locked>> | 94% | 55,608 psi | 87% | 2900 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 90% | 55,883 psi | 88% | 2838 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 56,275 psi | 88% | 2828 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,999 psi | 88% | 2864 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,768 psi | 89% | 2815 fps | 99.5% |
| Lovex S062 | <<locked>> | 96% | 56,492 psi | 89% | 2858 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,257 psi | 82% | 2792 fps | 96.9% |
| Norma 200 | <<locked>> | 82% | 57,566 psi | 90% | 2776 fps | 100% |
| Norma 201 | <<locked>> | 92% | 55,303 psi | 87% | 2828 fps | 99.9% |
| Norma 202 | <<locked>> | 92% | 55,912 psi | 88% | 2841 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,971 psi | 89% | 2907 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 46,949 psi | 74% | 2789 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 96% | 57,740 psi | 90% | 2936 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 56,753 psi | 89% | 2854 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,709 psi | 87% | 2874 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 88% | 57,479 psi | 90% | 2844 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,114 psi | 55% | 1755 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,680 psi | 87% | 2828 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 56,101 psi | 88% | 2851 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 54,331 psi | 85% | 2933 fps | 99% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 57,667 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,833 psi | 73% | 2815 fps | 96.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,935 psi | 75% | 2831 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 90% | 56,420 psi | 88% | 2818 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,854 psi | 88% | 2828 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2900 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,257 psi | 82% | 2792 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,999 psi | 88% | 2864 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 56,492 psi | 89% | 2858 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,608 psi | 87% | 2799 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,392 psi | 90% | 2490 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,984 psi | 86% | 2825 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 55,550 psi | 87% | 2913 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,013 psi | 86% | 2779 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,752 psi | 86% | 2828 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 55,201 psi | 87% | 2854 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 57,696 psi | 90% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 57,087 psi | 89% | 2772 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 57,421 psi | 90% | 2877 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 56,478 psi | 89% | 2776 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 54,099 psi | 85% | 2822 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 2900 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,887 psi | 66% | 2740 fps | 99% |
| Vihtavuori N130 | <<locked>> | 88% | 57,290 psi | 90% | 2749 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 57,551 psi | 90% | 2766 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 54,853 psi | 86% | 2799 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 56,333 psi | 88% | 2815 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 2835 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,487 psi | 78% | 2792 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 90% | 56,579 psi | 89% | 2841 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 54,389 psi | 85% | 2812 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,515 psi | 76% | 2795 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,705 psi | 79% | 2782 fps | 99.3% |
| Winchester 748 | <<locked>> | 90% | 55,912 psi | 88% | 2887 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,737 psi | 86% | 2861 fps | 99.6% |
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% | 42,409 psi | 66% | 2566 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,108 psi | 72% | 2667 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 34,838 psi | 55% | 2474 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,321 psi | 65% | 2618 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 32,938 psi | 52% | 2454 fps | 98.7% |
| Accurate 4350 | <<locked>> | 96% | 40,828 psi | 64% | 2680 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 50,647 psi | 79% | 2648 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,039 psi | 80% | 2671 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,972 psi | 61% | 2569 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 84% | 37,478 psi | 59% | 2516 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 50,923 psi | 80% | 2759 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,944 psi | 64% | 2585 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 80% | 40,045 psi | 63% | 2589 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,456 psi | 74% | 2782 fps | 98.9% |
| Alliant Power Pro 2000-MR | 73.9 gr | 84% | 40,089 psi | 63% | 2684 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,227 psi | 51% | 2434 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,834 psi | 75% | 2664 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 37,101 psi | 58% | 2546 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 96% | 41,350 psi | 65% | 2690 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 88% | 36,216 psi | 57% | 2605 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,734 psi | 78% | 2644 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 40,466 psi | 63% | 2615 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 31,546 psi | 49% | 2428 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,018 psi | 67% | 2585 fps | 99% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,131 psi | 61% | 2595 fps | 98.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,830 psi | 67% | 2726 fps | 97% |
| Hodgdon H322 | <<locked>> | 80% | 46,673 psi | 73% | 2694 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,413 psi | 74% | 2713 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 42,641 psi | 67% | 2651 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 39,247 psi | 62% | 2579 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,505 psi | 56% | 2530 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,099 psi | 55% | 2536 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,846 psi | 41% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,811 psi | 59% | 2533 fps | 96.7% |
| IMR 3031 | <<locked>> | 80% | 38,290 psi | 60% | 2589 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,941 psi | 58% | 2500 fps | 95.3% |
| IMR 4166 Enduron | <<locked>> | 90% | 51,213 psi | 80% | 2733 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 48,544 psi | 76% | 2635 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 53,534 psi | 84% | 2805 fps | 95.5% |
| IMR 4831 | <<locked>> | 96% | 39,450 psi | 62% | 2631 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 35,665 psi | 56% | 2526 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 40,944 psi | 64% | 2585 fps | 98.2% |
| Lovex D073.5 | <<locked>> | 80% | 45,934 psi | 72% | 2671 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 37,333 psi | 59% | 2549 fps | 98.8% |
| Lovex S060 | <<locked>> | 80% | 39,624 psi | 62% | 2516 fps | 96.7% |
| Lovex S062 | <<locked>> | 80% | 34,490 psi | 54% | 2457 fps | 96.6% |
| Lovex S065 | <<locked>> | 96% | 46,267 psi | 73% | 2690 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 53,925 psi | 85% | 2726 fps | 100% |
| Norma 201 | <<locked>> | 80% | 38,116 psi | 60% | 2523 fps | 97.6% |
| Norma 202 | <<locked>> | 80% | 38,232 psi | 60% | 2543 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 36,463 psi | 57% | 2536 fps | 95.8% |
| Norma URP | <<locked>> | 96% | 41,205 psi | 65% | 2677 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 82% | 36,071 psi | 57% | 2543 fps | 95.2% |
| Ramshot TAC | <<locked>> | 82% | 43,569 psi | 68% | 2631 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,914 psi | 63% | 2595 fps | 96.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,309 psi | 69% | 2628 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,020 psi | 41% | 1568 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,992 psi | 72% | 2674 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 49,153 psi | 77% | 2743 fps | 95.4% |
| ReloadSwiss RS 52 | 69.9 gr | 82% | 38,392 psi | 60% | 2641 fps | 95.7% |
| ReloadSwiss RS 60 | 69.3 gr | 80% | 29,747 psi | 47% | 2438 fps | 95.6% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 40,843 psi | 64% | 2697 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 44,730 psi | 70% | 2766 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 41,974 psi | 66% | 2582 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 36,332 psi | 57% | 2477 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 84% | 33,852 psi | 53% | 2480 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 46,267 psi | 73% | 2690 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,333 psi | 59% | 2549 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 34,490 psi | 54% | 2457 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,602 psi | 76% | 2690 fps | 99.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,404 psi | 85% | 2454 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 51,416 psi | 81% | 2772 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,143 psi | 55% | 2530 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,675 psi | 76% | 2684 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 41,640 psi | 65% | 2602 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,405 psi | 59% | 2533 fps | 96% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,842 psi | 62% | 2497 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,735 psi | 51% | 2362 fps | 99.1% |
| Somchem S321 | <<locked>> | 80% | 43,903 psi | 69% | 2661 fps | 99% |
| Somchem S335 | <<locked>> | 80% | 39,247 psi | 62% | 2500 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 38,508 psi | 60% | 2546 fps | 96.2% |
| Somchem S355 | <<locked>> | 82% | 32,880 psi | 52% | 2441 fps | 95% |
| Somchem S365 | <<locked>> | 90% | 30,400 psi | 48% | 2457 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 45,121 psi | 71% | 2572 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,943 psi | 63% | 2500 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,273 psi | 55% | 2477 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,187 psi | 57% | 2480 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 29,225 psi | 46% | 2329 fps | 95.1% |
| Vihtavuori N160 | <<locked>> | 94% | 40,654 psi | 64% | 2628 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 40,872 psi | 64% | 2579 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 80% | 34,737 psi | 54% | 2461 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 96% | 42,540 psi | 67% | 2687 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,084 psi | 53% | 2454 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 39,929 psi | 63% | 2618 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,666 psi | 57% | 2536 fps | 96.5% |
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 95 powders for .375 Weath. Mag. loaded with the .374 | 235gr | Rhino Penetrator. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,713 fps to 3,022 fps. Accurate 4350 gives the best case fill at 100 %, and 95 of the 95 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 235.0 gr projectile in 0.374" 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 52, ReloadSwiss RS 60 rank at the top here: for .375 Weath. Mag. with the .374 | 235gr | Rhino Penetrator 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.