Load Specifications
Load data in caliber .338 Win Mag. with .338 | 185gr | Peregrine VRG-3 bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR 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% | 55,956 psi | 90% | 2851 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,360 psi | 87% | 2874 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 53,417 psi | 86% | 2861 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,362 psi | 90% | 2940 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 53,301 psi | 85% | 2907 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,342 psi | 79% | 2910 fps | 98.1% |
| Accurate LT-30 | <<locked>> | 82% | 55,317 psi | 89% | 2795 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,782 psi | 89% | 2822 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,158 psi | 88% | 2946 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 56,014 psi | 90% | 2936 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 56,362 psi | 90% | 2917 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,273 psi | 87% | 2897 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 54,288 psi | 87% | 2877 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,854 psi | 90% | 3005 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,679 psi | 88% | 3054 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,463 psi | 89% | 2959 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,608 psi | 89% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 56,275 psi | 90% | 2979 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,515 psi | 78% | 2920 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 98% | 52,808 psi | 85% | 3022 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,621 psi | 88% | 2789 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,027 psi | 88% | 2956 fps | 99% |
| Bofors RP3 | <<locked>> | 96% | 55,956 psi | 90% | 2972 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,231 psi | 90% | 2884 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 53,127 psi | 85% | 2923 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,376 psi | 89% | 3025 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 84% | 55,100 psi | 88% | 2900 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,246 psi | 90% | 2927 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 53,809 psi | 86% | 2930 fps | 98.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 52,794 psi | 85% | 2966 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 90% | 55,724 psi | 89% | 2956 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,498 psi | 71% | 2799 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,549 psi | 87% | 2982 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,780 psi | 56% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 53,519 psi | 86% | 2904 fps | 99.7% |
| IMR 3031 | <<locked>> | 90% | 55,187 psi | 88% | 2943 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,477 psi | 89% | 2920 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,057 psi | 90% | 2900 fps | 96.6% |
| IMR 4198 | <<locked>> | 84% | 56,086 psi | 90% | 2818 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,448 psi | 89% | 2920 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,905 psi | 75% | 2851 fps | 97.7% |
| IMR 4895 | <<locked>> | 92% | 54,215 psi | 87% | 2963 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 54,273 psi | 87% | 2897 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 54,143 psi | 87% | 2881 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,230 psi | 87% | 2920 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,114 psi | 88% | 2874 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 54,955 psi | 88% | 2917 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,085 psi | 87% | 2904 fps | 97.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,459 psi | 83% | 2884 fps | 96% |
| Norma 201 | <<locked>> | 90% | 53,490 psi | 86% | 2884 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 54,201 psi | 87% | 2894 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,390 psi | 89% | 2966 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 49,052 psi | 79% | 2907 fps | 98% |
| Ramshot Big Game | <<locked>> | 94% | 56,405 psi | 90% | 2999 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,196 psi | 77% | 2890 fps | 96% |
| Ramshot TAC | <<locked>> | 88% | 54,911 psi | 88% | 2910 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,186 psi | 87% | 2933 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,419 psi | 89% | 2897 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,969 psi | 56% | 1818 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,853 psi | 86% | 2881 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,578 psi | 88% | 2913 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 52,997 psi | 85% | 2992 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 52,692 psi | 84% | 3031 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,037 psi | 79% | 2930 fps | 97.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,966 psi | 80% | 2956 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 88% | 54,331 psi | 87% | 2871 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,983 psi | 87% | 2884 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 55,564 psi | 89% | 2959 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,085 psi | 87% | 2904 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,230 psi | 87% | 2920 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,955 psi | 88% | 2917 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,459 psi | 83% | 2884 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 53,490 psi | 86% | 2848 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,186 psi | 87% | 2972 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 53,388 psi | 86% | 2835 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 52,750 psi | 85% | 2881 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 53,606 psi | 86% | 2913 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,666 psi | 89% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,579 psi | 89% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,766 psi | 88% | 2858 fps | 96.3% |
| Somchem S321 | <<locked>> | 86% | 55,593 psi | 89% | 2933 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,694 psi | 88% | 2831 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,246 psi | 90% | 2936 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 56,260 psi | 90% | 2963 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,627 psi | 70% | 2851 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 86% | 55,492 psi | 89% | 2805 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,753 psi | 89% | 2822 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 53,461 psi | 86% | 2858 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,824 psi | 88% | 2874 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,259 psi | 87% | 2890 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 51,750 psi | 83% | 2910 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 88% | 54,868 psi | 88% | 2897 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 92% | 52,852 psi | 85% | 2867 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,589 psi | 81% | 2907 fps | 98% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,649 psi | 84% | 2894 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 54,433 psi | 87% | 2946 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,026 psi | 85% | 2969 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 90% | 53,272 psi | 85% | 2920 fps | 99.7% |
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% | 43,279 psi | 69% | 2657 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,224 psi | 76% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,505 psi | 57% | 2559 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,540 psi | 68% | 2717 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 33,591 psi | 54% | 2539 fps | 99% |
| Accurate 4350 | <<locked>> | 94% | 39,595 psi | 63% | 2730 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 51,982 psi | 83% | 2746 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,388 psi | 84% | 2772 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,827 psi | 64% | 2664 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 36,303 psi | 58% | 2566 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 52,605 psi | 84% | 2864 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,945 psi | 67% | 2680 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 41,495 psi | 67% | 2687 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,805 psi | 78% | 2887 fps | 99.3% |
| Alliant Power Pro 2000-MR | 62.9 gr | 82% | 38,580 psi | 62% | 2733 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,069 psi | 53% | 2526 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,124 psi | 79% | 2762 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,665 psi | 57% | 2589 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 92% | 37,782 psi | 61% | 2690 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,969 psi | 56% | 2651 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,111 psi | 82% | 2743 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,943 psi | 62% | 2661 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 32,358 psi | 52% | 2520 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,063 psi | 71% | 2680 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,306 psi | 65% | 2697 fps | 98.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,396 psi | 71% | 2835 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 48,167 psi | 77% | 2795 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,979 psi | 79% | 2815 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 41,075 psi | 66% | 2697 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 98% | 49,516 psi | 79% | 2910 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 40,176 psi | 64% | 2677 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,301 psi | 55% | 2575 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,129 psi | 58% | 2635 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,701 psi | 41% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,856 psi | 62% | 2631 fps | 97.3% |
| IMR 3031 | <<locked>> | 80% | 39,421 psi | 63% | 2684 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,694 psi | 57% | 2546 fps | 95.3% |
| IMR 4166 Enduron | <<locked>> | 88% | 49,400 psi | 79% | 2789 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 49,763 psi | 80% | 2730 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 51,967 psi | 83% | 2861 fps | 95.7% |
| IMR 4831 | <<locked>> | 94% | 38,305 psi | 61% | 2680 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 36,506 psi | 59% | 2621 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 80% | 41,945 psi | 67% | 2680 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 47,036 psi | 75% | 2769 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 38,406 psi | 62% | 2644 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 40,538 psi | 65% | 2612 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 35,259 psi | 57% | 2549 fps | 97.2% |
| Lovex S065 | <<locked>> | 94% | 44,933 psi | 72% | 2746 fps | 95.6% |
| Lovex S070 | <<locked>> | 98% | 48,124 psi | 77% | 2822 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 38,972 psi | 62% | 2621 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 39,218 psi | 63% | 2638 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 35,012 psi | 56% | 2575 fps | 95.6% |
| Norma URP | <<locked>> | 94% | 40,161 psi | 64% | 2733 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 34,621 psi | 56% | 2585 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 98% | 45,078 psi | 72% | 2831 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 42,061 psi | 67% | 2677 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,176 psi | 66% | 2697 fps | 97.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,469 psi | 73% | 2730 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,947 psi | 42% | 1627 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,297 psi | 76% | 2776 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 47,819 psi | 77% | 2799 fps | 95.5% |
| ReloadSwiss RS 52 | 59.5 gr | 80% | 36,999 psi | 59% | 2684 fps | 95.6% |
| ReloadSwiss RS 60 | 60.5 gr | 80% | 30,487 psi | 49% | 2536 fps | 96.5% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 39,740 psi | 64% | 2749 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,468 psi | 70% | 2825 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 42,699 psi | 68% | 2677 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 37,043 psi | 59% | 2572 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 32,430 psi | 52% | 2516 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 44,933 psi | 72% | 2746 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,406 psi | 62% | 2644 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 35,259 psi | 57% | 2549 fps | 97.2% |
| Shooters World SW4350 | <<locked>> | 98% | 48,124 psi | 77% | 2822 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,024 psi | 80% | 2792 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 36,230 psi | 58% | 2628 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,995 psi | 80% | 2782 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 42,815 psi | 69% | 2703 fps | 95.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,464 psi | 62% | 2631 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,654 psi | 65% | 2592 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,460 psi | 54% | 2448 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 51,329 psi | 82% | 2805 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 45,194 psi | 72% | 2762 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 40,176 psi | 64% | 2592 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 39,653 psi | 64% | 2648 fps | 97% |
| Somchem S355 | <<locked>> | 82% | 33,605 psi | 54% | 2530 fps | 95.7% |
| Somchem S365 | <<locked>> | 88% | 29,356 psi | 47% | 2500 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 46,151 psi | 74% | 2667 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,901 psi | 66% | 2592 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,158 psi | 58% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,057 psi | 59% | 2572 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 29,834 psi | 48% | 2415 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 92% | 39,552 psi | 63% | 2684 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 42,018 psi | 67% | 2677 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 35,665 psi | 57% | 2552 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 94% | 41,423 psi | 66% | 2740 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,808 psi | 53% | 2497 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 41,118 psi | 66% | 2717 fps | 99.2% |
| Winchester 760 | <<locked>> | 98% | 49,516 psi | 79% | 2910 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,782 psi | 61% | 2631 fps | 97.2% |
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 110 powders for .338 Win Mag. loaded with the .338 | 185gr | Peregrine VRG-3. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,054 fps. Accurate 4350 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. The 185.0 gr projectile in 0.338" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .338 Win Mag. with the .338 | 185gr | Peregrine VRG-3 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-26, Hodgdon H4350, IMR 4350 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.