Load Specifications
Bullet:.338 | 225gr | Hornady GMX
Bullet Manufacturer:Hornady
Bullet Weight:225 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Blaser Mag. load data
Case Length (l3):2.5078"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:92.6 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:25.6"
Max. allowed Pressure:60,916 psi
Recommended Twist Rate:1:12.0
Load data in caliber .338 Blaser Mag. with .338 | 225gr | Hornady GMX bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Winchester 760.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 52,040 psi | 85% | 2559 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,519 psi | 88% | 2625 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 52,127 psi | 86% | 2648 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,127 psi | 87% | 2638 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,886 psi | 67% | 2543 fps | 97.1% |
| Accurate 4064 | <<locked>> | 90% | 53,722 psi | 88% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,795 psi | 88% | 2766 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 54,636 psi | 90% | 2713 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 52,272 psi | 86% | 2664 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 49,124 psi | 81% | 2694 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,679 psi | 88% | 2661 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,650 psi | 90% | 2631 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,317 psi | 89% | 2831 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 48,820 psi | 80% | 2694 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 52,112 psi | 86% | 2684 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 52,779 psi | 87% | 2707 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,085 psi | 90% | 2818 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,866 psi | 87% | 2805 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 48,037 psi | 79% | 2684 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,131 psi | 64% | 2572 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,816 psi | 72% | 2733 fps | 99.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,288 psi | 89% | 2726 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 52,605 psi | 86% | 2700 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 52,939 psi | 87% | 2677 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 52,025 psi | 85% | 2595 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,750 psi | 87% | 2690 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,824 psi | 90% | 2785 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,447 psi | 88% | 2710 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 96% | 53,142 psi | 87% | 2766 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 94% | 54,070 psi | 89% | 2730 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 84% | 51,793 psi | 85% | 2671 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,474 psi | 85% | 2697 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,578 psi | 90% | 2753 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,809 psi | 88% | 2805 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,505 psi | 58% | 1634 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,040 psi | 87% | 2674 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,085 psi | 90% | 2694 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,071 psi | 90% | 2694 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 51,793 psi | 85% | 2631 fps | 98.2% |
| IMR 4350 | <<locked>> | 98% | 53,171 psi | 87% | 2700 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,868 psi | 90% | 2707 fps | 98.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,360 psi | 89% | 2756 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 54,143 psi | 89% | 2733 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,679 psi | 88% | 2661 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,157 psi | 89% | 2684 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,099 psi | 89% | 2638 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,926 psi | 90% | 2690 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,969 psi | 89% | 2697 fps | 99.4% |
| Lovex S070 | <<locked>> | 98% | 54,853 psi | 90% | 2730 fps | 98.9% |
| Norma 201 | <<locked>> | 86% | 53,243 psi | 87% | 2654 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,853 psi | 88% | 2654 fps | 100% |
| Norma 203B | <<locked>> | 88% | 52,025 psi | 85% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 98% | 53,650 psi | 88% | 2749 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 43,888 psi | 72% | 2690 fps | 96.7% |
| Norma URP | <<locked>> | 98% | 52,924 psi | 87% | 2753 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 52,446 psi | 86% | 2717 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 51,779 psi | 85% | 2753 fps | 99% |
| Ramshot TAC | <<locked>> | 84% | 53,853 psi | 88% | 2684 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,432 psi | 88% | 2700 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,273 psi | 89% | 2664 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 59% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,911 psi | 89% | 2697 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,011 psi | 87% | 2766 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 52,547 psi | 86% | 2799 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,374 psi | 88% | 2789 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,098 psi | 87% | 2818 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 53,925 psi | 89% | 2631 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,737 psi | 88% | 2654 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 52,489 psi | 86% | 2690 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 46,456 psi | 76% | 2661 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 94% | 52,939 psi | 87% | 2677 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,969 psi | 89% | 2697 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,157 psi | 89% | 2684 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,926 psi | 90% | 2690 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,853 psi | 90% | 2730 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,433 psi | 89% | 2753 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 52,170 psi | 86% | 2661 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 52,939 psi | 87% | 2684 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,853 psi | 90% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 51,677 psi | 85% | 2549 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,288 psi | 89% | 2651 fps | 98.5% |
| Somchem S321 | <<locked>> | 82% | 54,549 psi | 90% | 2690 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,186 psi | 89% | 2592 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 51,706 psi | 85% | 2651 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 52,924 psi | 87% | 2690 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,908 psi | 84% | 2756 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,123 psi | 77% | 2644 fps | 96.9% |
| Vihtavuori N130 | <<locked>> | 82% | 54,708 psi | 90% | 2556 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 51,967 psi | 85% | 2536 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,490 psi | 88% | 2615 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,375 psi | 89% | 2635 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,404 psi | 89% | 2667 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 52,083 psi | 86% | 2703 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 53,983 psi | 89% | 2661 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 52,446 psi | 86% | 2635 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,549 psi | 90% | 2756 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,062 psi | 71% | 2644 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 52,214 psi | 86% | 2680 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,954 psi | 89% | 2707 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,388 psi | 88% | 2769 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,853 psi | 57% | 2582 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 52,692 psi | 87% | 2690 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 48,747 psi | 80% | 2516 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,176 psi | 68% | 2448 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,588 psi | 80% | 2595 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,714 psi | 72% | 2484 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 35,505 psi | 58% | 2438 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 38,957 psi | 64% | 2448 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,560 psi | 50% | 2336 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 45,136 psi | 74% | 2562 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 38,261 psi | 63% | 2421 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 46,021 psi | 76% | 2638 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,268 psi | 78% | 2566 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,572 psi | 78% | 2543 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,002 psi | 67% | 2602 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 45,774 psi | 75% | 2641 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,956 psi | 62% | 2444 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,770 psi | 67% | 2503 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,343 psi | 51% | 2356 fps | 95.8% |
| Alliant Reloder-17 | 58.7 gr | 80% | 32,619 psi | 54% | 2418 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 45,078 psi | 74% | 2631 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 26,876 psi | 44% | 2264 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 32,953 psi | 54% | 2487 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,309 psi | 73% | 2569 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 37,420 psi | 61% | 2444 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 41,118 psi | 68% | 2474 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,878 psi | 80% | 2552 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,963 psi | 75% | 2589 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,068 psi | 84% | 2733 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,319 psi | 63% | 2451 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 37,942 psi | 62% | 2493 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 44,411 psi | 73% | 2569 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 45,556 psi | 75% | 2572 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,731 psi | 44% | 2205 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,640 psi | 68% | 2549 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 40,321 psi | 66% | 2566 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 43% | 1460 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,714 psi | 72% | 2526 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 45,324 psi | 74% | 2559 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,190 psi | 66% | 2451 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,670 psi | 70% | 2474 fps | 96.3% |
| IMR 4350 | <<locked>> | 90% | 41,234 psi | 68% | 2500 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,277 psi | 66% | 2457 fps | 95.5% |
| IMR 4831 | <<locked>> | 82% | 29,820 psi | 49% | 2300 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 41,785 psi | 69% | 2533 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 47,268 psi | 78% | 2566 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,193 psi | 73% | 2539 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,208 psi | 74% | 2500 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 40,147 psi | 66% | 2457 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 34,867 psi | 57% | 2352 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 37,492 psi | 62% | 2431 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,077 psi | 72% | 2516 fps | 100% |
| Norma 202 | <<locked>> | 80% | 44,556 psi | 73% | 2520 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,103 psi | 66% | 2493 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 46,818 psi | 77% | 2638 fps | 95.4% |
| Norma MRP | <<locked>> | 98% | 40,901 psi | 67% | 2631 fps | 95.8% |
| Norma URP | <<locked>> | 82% | 31,111 psi | 51% | 2339 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,668 psi | 65% | 2507 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 37,231 psi | 61% | 2487 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 47,195 psi | 77% | 2582 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,630 psi | 77% | 2595 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,778 psi | 83% | 2612 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,629 psi | 44% | 1493 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,725 psi | 64% | 2434 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,105 psi | 71% | 2605 fps | 99.3% |
| ReloadSwiss RS 60 | 58.7 gr | 80% | 34,795 psi | 57% | 2480 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 30,458 psi | 50% | 2352 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 32,880 psi | 54% | 2411 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 47,892 psi | 79% | 2546 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,901 psi | 69% | 2467 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 35,215 psi | 58% | 2392 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 43,453 psi | 71% | 2608 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 41,118 psi | 68% | 2474 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 34,867 psi | 57% | 2352 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,193 psi | 73% | 2539 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,147 psi | 66% | 2457 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 37,492 psi | 62% | 2431 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,303 psi | 60% | 2444 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,237 psi | 74% | 2552 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,584 psi | 72% | 2536 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,426 psi | 75% | 2461 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,768 psi | 62% | 2339 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,001 psi | 64% | 2402 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 51,010 psi | 84% | 2641 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,078 psi | 74% | 2464 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,092 psi | 74% | 2549 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 36,114 psi | 59% | 2398 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 26,063 psi | 43% | 2244 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 41,249 psi | 68% | 2539 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 51,271 psi | 84% | 2510 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,847 psi | 75% | 2454 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,437 psi | 68% | 2444 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,163 psi | 69% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,360 psi | 56% | 2339 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 30,530 psi | 50% | 2293 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 47,340 psi | 78% | 2562 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,480 psi | 66% | 2451 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 31,981 psi | 53% | 2346 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 28,790 psi | 47% | 2336 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,284 psi | 50% | 2270 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 47,152 psi | 77% | 2608 fps | 100% |
| Winchester 760 | 61.8 gr | 86% | 38,101 psi | 63% | 2500 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,890 psi | 44% | 2339 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,062 psi | 71% | 2539 fps | 99.8% |
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 102 powders for .338 Blaser Mag. loaded with the .338 | 225gr | Hornady GMX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,831 fps; across all powders the maximum-charge window runs from 1,634 fps to 2,831 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:12.0 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. Alliant Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .338 Blaser Mag. with the .338 | 225gr | Hornady GMX 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.