Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 185gr | Barnes MRX BT bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 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 2495 | <<locked>> | 84% | 54,650 psi | 86% | 2923 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,462 psi | 85% | 2936 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,966 psi | 78% | 2949 fps | 98.6% |
| Accurate 4064 | <<locked>> | 86% | 55,071 psi | 86% | 2976 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,014 psi | 88% | 3077 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 54,636 psi | 86% | 3009 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,869 psi | 88% | 3012 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3120 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,898 psi | 89% | 3005 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,216 psi | 87% | 3136 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,507 psi | 89% | 3035 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,826 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,072 psi | 89% | 3140 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,665 psi | 86% | 3110 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 3100 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,038 psi | 78% | 3035 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,079 psi | 74% | 2976 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,060 psi | 64% | 2874 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,317 psi | 85% | 3176 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,650 psi | 86% | 3022 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 57,348 psi | 90% | 3051 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,038 psi | 78% | 3035 fps | 96.4% |
| Bofors RP7 | <<locked>> | 92% | 56,826 psi | 89% | 3028 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,884 psi | 89% | 3035 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,215 psi | 85% | 3012 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 54,940 psi | 86% | 3074 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 54,795 psi | 86% | 3031 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 55,230 psi | 87% | 3018 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,334 psi | 90% | 3058 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,535 psi | 87% | 3054 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,463 psi | 87% | 3110 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,984 psi | 56% | 1903 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,492 psi | 89% | 3022 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,811 psi | 87% | 2999 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,216 psi | 87% | 2992 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,723 psi | 86% | 2972 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 54,418 psi | 85% | 3005 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,288 psi | 87% | 3005 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 56,579 psi | 89% | 3068 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,578 psi | 86% | 3031 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,029 psi | 89% | 3041 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 82% | 56,898 psi | 89% | 3005 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,766 psi | 86% | 2979 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,014 psi | 89% | 2986 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,259 psi | 87% | 2986 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,868 psi | 86% | 2999 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 56,260 psi | 88% | 3041 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,176 psi | 65% | 2785 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 56,753 psi | 89% | 3005 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,580 psi | 90% | 2999 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,086 psi | 88% | 3045 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,042 psi | 86% | 3054 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 53,214 psi | 83% | 3127 fps | 98.4% |
| Norma URP | <<locked>> | 94% | 54,940 psi | 86% | 3064 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 57,058 psi | 89% | 3071 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,493 psi | 90% | 3117 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 57,217 psi | 90% | 3031 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,319 psi | 90% | 3048 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 57% | 1949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,259 psi | 85% | 2992 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,114 psi | 85% | 3071 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,230 psi | 85% | 3107 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,217 psi | 88% | 3100 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,013 psi | 86% | 3130 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 57,130 psi | 90% | 2976 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,246 psi | 90% | 3002 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,188 psi | 90% | 3045 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,593 psi | 87% | 3028 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 3087 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 56,826 psi | 89% | 3028 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,868 psi | 86% | 2999 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,766 psi | 86% | 2979 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,259 psi | 87% | 2986 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,260 psi | 88% | 3041 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,434 psi | 87% | 3051 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,912 psi | 88% | 3009 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,666 psi | 89% | 3031 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,682 psi | 90% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,158 psi | 86% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,911 psi | 86% | 2949 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,172 psi | 86% | 3081 fps | 97.5% |
| Somchem S335 | <<locked>> | 84% | 57,392 psi | 90% | 2930 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,579 psi | 87% | 2995 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,188 psi | 90% | 3038 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 57,740 psi | 90% | 3117 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3061 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 54,781 psi | 86% | 2871 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,667 psi | 90% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,621 psi | 86% | 2927 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,129 psi | 86% | 2963 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,203 psi | 90% | 3058 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,573 psi | 76% | 2913 fps | 96.5% |
| Vihtavuori N530 | <<locked>> | 82% | 57,377 psi | 90% | 3005 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,405 psi | 88% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,289 psi | 88% | 3064 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3058 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,377 psi | 90% | 3028 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,129 psi | 86% | 3077 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,380 psi | 66% | 3015 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,884 psi | 89% | 3038 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,026 psi | 83% | 2995 fps | 96.8% |
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 2495 | <<locked>> | 80% | 47,761 psi | 75% | 2818 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 44,614 psi | 70% | 2762 fps | 95.6% |
| Accurate 3100 | <<locked>> | 92% | 37,681 psi | 59% | 2710 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 45,266 psi | 71% | 2822 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,026 psi | 53% | 2648 fps | 96% |
| ADI AR 2206H | <<locked>> | 80% | 51,242 psi | 80% | 2953 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,424 psi | 68% | 2792 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 47,195 psi | 74% | 2933 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,417 psi | 84% | 2956 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,761 psi | 75% | 3009 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,656 psi | 68% | 2818 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,760 psi | 73% | 2887 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,678 psi | 53% | 2661 fps | 96.1% |
| Alliant Reloder-17 | 77.2 gr | 80% | 38,232 psi | 60% | 2799 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,470 psi | 73% | 2920 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,804 psi | 73% | 2972 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,689 psi | 47% | 2566 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,100 psi | 57% | 2753 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,592 psi | 54% | 2756 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,981 psi | 80% | 2963 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,656 psi | 68% | 2825 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 46,804 psi | 73% | 2972 fps | 95.5% |
| Bofors RP7 | <<locked>> | 84% | 43,976 psi | 69% | 2795 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,214 psi | 83% | 2982 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,266 psi | 69% | 2831 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 41,669 psi | 65% | 2825 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 84% | 45,078 psi | 71% | 2854 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 51,837 psi | 81% | 2963 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,169 psi | 49% | 2556 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,269 psi | 76% | 2936 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 44,309 psi | 69% | 2907 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,774 psi | 42% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,516 psi | 78% | 2910 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,156 psi | 82% | 2946 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,658 psi | 72% | 2828 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,080 psi | 75% | 2858 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 41,901 psi | 66% | 2772 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,234 psi | 63% | 2720 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 32,938 psi | 52% | 2605 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 47,979 psi | 75% | 2920 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,505 psi | 84% | 2986 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 53,417 psi | 84% | 2956 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,155 psi | 80% | 2927 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,502 psi | 79% | 2881 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,745 psi | 72% | 2828 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,579 psi | 59% | 2664 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 40,741 psi | 64% | 2749 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 38,551 psi | 60% | 2730 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 49,951 psi | 78% | 2897 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,676 psi | 79% | 2897 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,093 psi | 72% | 2874 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 47,877 psi | 75% | 2927 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 43,004 psi | 67% | 2927 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,243 psi | 54% | 2651 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 46,383 psi | 73% | 2894 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 38,087 psi | 60% | 2749 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 53,447 psi | 84% | 2972 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,476 psi | 84% | 2989 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 43% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,396 psi | 70% | 2812 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,401 psi | 79% | 3012 fps | 99.8% |
| ReloadSwiss RS 60 | 77.2 gr | 80% | 40,698 psi | 64% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,910 psi | 53% | 2664 fps | 95.5% |
| ReloadSwiss RS 70 | 80.3 gr | 82% | 35,781 psi | 56% | 2730 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 53,838 psi | 84% | 2930 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,384 psi | 74% | 2844 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,002 psi | 64% | 2766 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 96% | 52,083 psi | 82% | 2969 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 45,455 psi | 71% | 2904 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 43,976 psi | 69% | 2795 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,579 psi | 59% | 2664 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,155 psi | 80% | 2927 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,745 psi | 72% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,741 psi | 64% | 2749 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,351 psi | 66% | 2822 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,040 psi | 82% | 2946 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,806 psi | 78% | 2920 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,024 psi | 80% | 2838 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,873 psi | 67% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,363 psi | 62% | 2661 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,034 psi | 71% | 2897 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,691 psi | 79% | 2835 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,808 psi | 81% | 2936 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,539 psi | 65% | 2769 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 30,690 psi | 48% | 2598 fps | 98.1% |
| Somchem S385 | <<locked>> | 92% | 43,062 psi | 67% | 2825 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,561 psi | 81% | 2822 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,616 psi | 75% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,037 psi | 75% | 2828 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,668 psi | 62% | 2697 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,665 psi | 56% | 2654 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 98% | 45,440 psi | 71% | 2854 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 53,780 psi | 84% | 2953 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,398 psi | 73% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,143 psi | 55% | 2651 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 30,327 psi | 48% | 2582 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,041 psi | 55% | 2625 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 41,829 psi | 66% | 2828 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,920 psi | 44% | 2589 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,734 psi | 78% | 2923 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,006 psi | 72% | 2871 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 115 powders for .338 Norma Mag. loaded with the .338 | 185gr | Barnes MRX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,176 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 185.0 gr projectile in 0.338" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .338 Norma Mag. with the .338 | 185gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Hodgdon H1000 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.