Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:185 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Norma Mag. load data
Case Length (l3):2.49"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:105.4 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:16.5
Load data in caliber .338 Norma Mag. with .338 | 185gr | Peregrine Bushmaster (VRG-3) bullet and 99 powders. The key underlying parameters are shown in the table above.
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>> | 82% | 55,506 psi | 87% | 2887 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,505 psi | 85% | 2910 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,304 psi | 88% | 2979 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,421 psi | 90% | 2976 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,818 psi | 72% | 2867 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 54,824 psi | 86% | 2963 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,651 psi | 87% | 3058 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 54,926 psi | 86% | 2995 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,188 psi | 88% | 2999 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 3038 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,363 psi | 90% | 2999 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,114 psi | 86% | 2920 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,230 psi | 87% | 3123 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,432 psi | 84% | 3028 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,478 psi | 89% | 3022 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,014 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,695 psi | 89% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,302 psi | 85% | 3094 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3018 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,511 psi | 68% | 2897 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,472 psi | 78% | 3081 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,969 psi | 86% | 3012 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 57,217 psi | 90% | 3035 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,174 psi | 90% | 3015 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,259 psi | 87% | 2927 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,145 psi | 90% | 3025 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,331 psi | 85% | 2995 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 54,752 psi | 86% | 3054 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 54,984 psi | 86% | 3015 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 84% | 55,506 psi | 87% | 3009 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3038 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,695 psi | 87% | 3045 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,288 psi | 87% | 3091 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,636 psi | 56% | 1873 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,869 psi | 89% | 3012 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,927 psi | 88% | 2989 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,564 psi | 87% | 2982 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,332 psi | 87% | 2963 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 54,230 psi | 85% | 2986 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,535 psi | 87% | 2989 fps | 98.2% |
| IMR 4831 | <<locked>> | 98% | 56,246 psi | 88% | 3048 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 54,694 psi | 86% | 3022 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 57,363 psi | 90% | 2999 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,926 psi | 86% | 2969 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,595 psi | 90% | 2972 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,506 psi | 87% | 2976 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,998 psi | 86% | 2982 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 56,159 psi | 88% | 3022 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 56,971 psi | 89% | 2989 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,230 psi | 85% | 2940 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,260 psi | 88% | 3031 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,056 psi | 86% | 3035 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 48,965 psi | 77% | 3031 fps | 97.2% |
| Norma URP | <<locked>> | 96% | 54,621 psi | 86% | 3045 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 57,159 psi | 90% | 3058 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 57,290 psi | 90% | 3097 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 53,969 psi | 85% | 2959 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,725 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,201 psi | 57% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,549 psi | 85% | 2976 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,070 psi | 85% | 3061 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,983 psi | 85% | 3094 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,695 psi | 87% | 3081 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,781 psi | 86% | 3110 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 57,667 psi | 90% | 2969 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,508 psi | 90% | 2989 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 57,290 psi | 90% | 3031 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,619 psi | 81% | 3002 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 94% | 57,174 psi | 90% | 3015 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,998 psi | 86% | 2982 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,926 psi | 86% | 2969 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,506 psi | 87% | 2976 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,159 psi | 88% | 3022 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,434 psi | 87% | 3038 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,333 psi | 88% | 2999 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,174 psi | 90% | 3022 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,926 psi | 86% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,622 psi | 87% | 2877 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,071 psi | 86% | 2930 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2999 fps | 96.2% |
| Somchem S335 | <<locked>> | 84% | 54,288 psi | 85% | 2874 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,999 psi | 88% | 2986 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 57,305 psi | 90% | 3025 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 3100 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,373 psi | 82% | 2982 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 84% | 55,361 psi | 87% | 2864 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,653 psi | 90% | 2949 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,868 psi | 86% | 2917 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,376 psi | 87% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,087 psi | 89% | 3041 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 54,302 psi | 85% | 2946 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,623 psi | 89% | 2963 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,086 psi | 88% | 3045 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,428 psi | 76% | 2979 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,334 psi | 90% | 3015 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,592 psi | 86% | 2992 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,955 psi | 86% | 3061 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,015 psi | 61% | 2920 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,261 psi | 90% | 3028 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 52,011 psi | 82% | 2838 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,657 psi | 70% | 2759 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,605 psi | 82% | 2927 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,934 psi | 74% | 2799 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 39,827 psi | 62% | 2749 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 42,308 psi | 66% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,707 psi | 53% | 2631 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 48,356 psi | 76% | 2887 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,973 psi | 64% | 2726 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 50,357 psi | 79% | 2976 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,531 psi | 79% | 2894 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,445 psi | 81% | 2871 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,556 psi | 70% | 2930 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,053 psi | 78% | 2969 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,843 psi | 64% | 2749 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,947 psi | 69% | 2822 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,707 psi | 53% | 2648 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,462 psi | 56% | 2720 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,342 psi | 77% | 2963 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,356 psi | 46% | 2546 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,753 psi | 58% | 2805 fps | 96.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,906 psi | 75% | 2890 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 40,669 psi | 64% | 2753 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 44,237 psi | 69% | 2785 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,953 psi | 81% | 2874 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,908 psi | 78% | 2913 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,481 psi | 65% | 2762 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 41,611 psi | 65% | 2808 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 48,211 psi | 76% | 2897 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 48,892 psi | 77% | 2897 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,979 psi | 45% | 2484 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,078 psi | 71% | 2867 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 44,179 psi | 69% | 2887 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,527 psi | 42% | 1677 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,760 psi | 73% | 2844 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 48,834 psi | 77% | 2884 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,004 psi | 67% | 2762 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,469 psi | 71% | 2785 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 44,831 psi | 70% | 2815 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,047 psi | 67% | 2762 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 32,648 psi | 51% | 2585 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 45,063 psi | 71% | 2851 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 50,531 psi | 79% | 2894 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,935 psi | 75% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,935 psi | 75% | 2818 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 43,018 psi | 67% | 2766 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 37,536 psi | 59% | 2648 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 40,654 psi | 64% | 2733 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 47,181 psi | 74% | 2835 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,630 psi | 75% | 2838 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,279 psi | 68% | 2805 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 51,285 psi | 80% | 2972 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 42,525 psi | 67% | 2900 fps | 95.3% |
| Norma URP | <<locked>> | 82% | 33,982 psi | 53% | 2635 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 43,279 psi | 68% | 2822 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 40,596 psi | 64% | 2795 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 50,575 psi | 79% | 2904 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,328 psi | 79% | 2923 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 42% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,713 psi | 65% | 2743 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,891 psi | 73% | 2933 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,768 psi | 59% | 2789 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,605 psi | 53% | 2648 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 35,752 psi | 56% | 2713 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 50,952 psi | 80% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,802 psi | 70% | 2782 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 38,189 psi | 60% | 2694 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 98% | 48,211 psi | 76% | 2943 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 86% | 44,237 psi | 69% | 2785 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,536 psi | 59% | 2648 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,935 psi | 75% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,018 psi | 67% | 2766 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 40,654 psi | 64% | 2733 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,450 psi | 62% | 2749 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,950 psi | 77% | 2877 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,833 psi | 73% | 2854 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,341 psi | 76% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,451 psi | 63% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,221 psi | 66% | 2707 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,747 psi | 75% | 2936 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 48,051 psi | 75% | 2779 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,733 psi | 76% | 2871 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 38,957 psi | 61% | 2703 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 28,369 psi | 44% | 2523 fps | 96.7% |
| Somchem S385 | <<locked>> | 96% | 45,687 psi | 72% | 2864 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 48,834 psi | 77% | 2769 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,657 psi | 70% | 2759 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,194 psi | 71% | 2769 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,101 psi | 58% | 2635 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 33,185 psi | 52% | 2582 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 50,691 psi | 79% | 2887 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,671 psi | 68% | 2759 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,940 psi | 55% | 2638 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 31,995 psi | 50% | 2625 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,822 psi | 51% | 2556 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 50,981 psi | 80% | 2936 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,771 psi | 65% | 2815 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,617 psi | 46% | 2631 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,586 psi | 73% | 2858 fps | 99.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 99 powders for .338 Norma Mag. loaded with the .338 | 185gr | Peregrine Bushmaster (VRG-3). Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,123 fps; across all powders the maximum-charge window runs from 1,873 fps to 3,123 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 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 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.