Load Specifications
Bullet:.338 | 250gr | Norma GTX
Bullet Manufacturer:Norma
Bullet Weight:250 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:1:12.5
Load data in caliber .338 Blaser Mag. with .338 | 250gr | Norma GTX bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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 2495 | <<locked>> | 84% | 53,635 psi | 88% | 2474 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 51,721 psi | 85% | 2490 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,630 psi | 78% | 2526 fps | 99.3% |
| Accurate 4064 | <<locked>> | 86% | 53,693 psi | 88% | 2523 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,795 psi | 88% | 2621 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 53,229 psi | 87% | 2549 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,259 psi | 89% | 2552 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,969 psi | 90% | 2661 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 49,124 psi | 81% | 2595 fps | 96.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,040 psi | 87% | 2667 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,650 psi | 90% | 2572 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,998 psi | 90% | 2595 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,563 psi | 90% | 2671 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 51,982 psi | 85% | 2648 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,998 psi | 89% | 2648 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,442 psi | 78% | 2598 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,744 psi | 73% | 2543 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,334 psi | 65% | 2474 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,604 psi | 83% | 2713 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,881 psi | 87% | 2569 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 43,642 psi | 72% | 2530 fps | 96.5% |
| Bofors RP3 | <<locked>> | 86% | 51,967 psi | 85% | 2546 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,442 psi | 78% | 2598 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 51,880 psi | 85% | 2530 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 86% | 52,663 psi | 86% | 2562 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 52,518 psi | 86% | 2618 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 52,866 psi | 87% | 2582 fps | 98.5% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 52,736 psi | 87% | 2602 fps | 96.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 51,517 psi | 85% | 2585 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 53,780 psi | 88% | 2556 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,621 psi | 90% | 2595 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,664 psi | 88% | 2592 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,547 psi | 86% | 2657 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 59% | 1555 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,998 psi | 90% | 2559 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,331 psi | 89% | 2533 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,954 psi | 89% | 2539 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,258 psi | 87% | 2523 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 52,286 psi | 86% | 2559 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,519 psi | 88% | 2556 fps | 99.2% |
| IMR 4831 | <<locked>> | 96% | 54,085 psi | 89% | 2612 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 53,055 psi | 87% | 2575 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 54,607 psi | 90% | 2595 fps | 96.8% |
| Lovex D073.6 | <<locked>> | 82% | 53,359 psi | 88% | 2523 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 52,620 psi | 86% | 2484 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,925 psi | 89% | 2533 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,345 psi | 88% | 2552 fps | 99.8% |
| Lovex S070 | <<locked>> | 94% | 54,157 psi | 89% | 2585 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,668 psi | 65% | 2392 fps | 98% |
| Norma 201 | <<locked>> | 82% | 52,185 psi | 86% | 2500 fps | 100% |
| Norma 202 | <<locked>> | 82% | 52,707 psi | 87% | 2493 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,288 psi | 89% | 2582 fps | 100% |
| Norma 204 | <<locked>> | 94% | 52,620 psi | 86% | 2605 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 50,125 psi | 82% | 2674 fps | 99.1% |
| Norma URP | <<locked>> | 94% | 52,533 psi | 86% | 2608 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 54,984 psi | 90% | 2612 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,897 psi | 90% | 2661 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 41,365 psi | 68% | 2467 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 60% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 52,721 psi | 87% | 2546 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 52,228 psi | 86% | 2608 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 51,866 psi | 85% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,272 psi | 87% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,286 psi | 86% | 2671 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 38,014 psi | 62% | 2477 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 84% | 52,678 psi | 86% | 2497 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 52,054 psi | 85% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 53,316 psi | 88% | 2582 fps | 97.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,895 psi | 87% | 2631 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 90% | 51,880 psi | 85% | 2530 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,345 psi | 88% | 2552 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,359 psi | 88% | 2523 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,925 psi | 89% | 2533 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,157 psi | 89% | 2585 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,548 psi | 88% | 2598 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,172 psi | 89% | 2556 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 51,663 psi | 85% | 2526 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,200 psi | 87% | 2431 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,751 psi | 88% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,040 psi | 87% | 2510 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,431 psi | 86% | 2628 fps | 98.3% |
| Somchem S335 | <<locked>> | 82% | 52,852 psi | 87% | 2434 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,838 psi | 88% | 2543 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 52,199 psi | 86% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 55,100 psi | 90% | 2579 fps | 96.6% |
| Somchem S365 | <<locked>> | 98% | 54,708 psi | 90% | 2654 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,606 psi | 88% | 2612 fps | 99% |
| Vihtavuori N133 | <<locked>> | 82% | 53,664 psi | 88% | 2418 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 52,736 psi | 87% | 2457 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,229 psi | 87% | 2477 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,461 psi | 88% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,969 psi | 90% | 2602 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,325 psi | 76% | 2490 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 86% | 54,795 psi | 90% | 2520 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,896 psi | 88% | 2608 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,009 psi | 82% | 2612 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 50,807 psi | 83% | 2661 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,607 psi | 90% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 52,736 psi | 87% | 2621 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,306 psi | 66% | 2592 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,955 psi | 90% | 2579 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,343 psi | 83% | 2556 fps | 97.7% |
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 2495 | <<locked>> | 80% | 47,094 psi | 77% | 2392 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,498 psi | 75% | 2392 fps | 97.5% |
| Accurate 3100 | <<locked>> | 88% | 31,807 psi | 52% | 2234 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 44,585 psi | 73% | 2395 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,301 psi | 55% | 2274 fps | 97.9% |
| ADI AR 2206H | <<locked>> | 80% | 49,966 psi | 82% | 2503 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,627 psi | 70% | 2375 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 39,914 psi | 66% | 2405 fps | 95% |
| ADI AR 2213 | <<locked>> | 98% | 46,021 psi | 76% | 2543 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,166 psi | 76% | 2562 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,670 psi | 70% | 2398 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,585 psi | 75% | 2454 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,228 psi | 55% | 2287 fps | 98% |
| Alliant Reloder-17 | 58.9 gr | 80% | 37,159 psi | 61% | 2398 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 39,494 psi | 65% | 2402 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 39,175 psi | 64% | 2444 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 24,149 psi | 40% | 2070 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 92% | 30,777 psi | 51% | 2267 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 84% | 29,051 psi | 48% | 2267 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,545 psi | 81% | 2520 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 40,959 psi | 67% | 2477 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 42,598 psi | 70% | 2405 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 39,175 psi | 64% | 2444 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 38,043 psi | 62% | 2290 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 43,308 psi | 71% | 2415 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 35,404 psi | 58% | 2316 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 38,450 psi | 63% | 2333 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 98% | 49,400 psi | 81% | 2552 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 48,254 psi | 79% | 2533 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 50,531 psi | 83% | 2510 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,647 psi | 50% | 2192 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,847 psi | 77% | 2497 fps | 100% |
| Hodgdon Superformance | 63.8 gr | 82% | 36,941 psi | 61% | 2375 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,934 psi | 44% | 1388 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,515 psi | 80% | 2470 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,865 psi | 84% | 2487 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,773 psi | 74% | 2402 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,108 psi | 77% | 2428 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 35,984 psi | 59% | 2274 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,494 psi | 65% | 2320 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 32,329 psi | 53% | 2238 fps | 97.6% |
| IMR 4895 | <<locked>> | 80% | 46,746 psi | 77% | 2480 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 48,269 psi | 79% | 2497 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 80% | 49,792 psi | 82% | 2477 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,458 psi | 81% | 2438 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,875 psi | 74% | 2402 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,941 psi | 61% | 2277 fps | 97.5% |
| Lovex S070 | <<locked>> | 80% | 35,128 psi | 58% | 2257 fps | 95.8% |
| Lovex S071 | <<locked>> | 92% | 30,763 psi | 51% | 2208 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 49,023 psi | 80% | 2454 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,472 psi | 81% | 2451 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,962 psi | 74% | 2444 fps | 100% |
| Norma 204 | <<locked>> | 86% | 40,306 psi | 66% | 2398 fps | 95.1% |
| Norma MRP | <<locked>> | 90% | 35,897 psi | 59% | 2405 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 33,431 psi | 55% | 2274 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 44,904 psi | 74% | 2464 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 32,576 psi | 53% | 2260 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 38,508 psi | 63% | 2411 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 45% | 1424 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,424 psi | 71% | 2398 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,921 psi | 80% | 2559 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,494 psi | 65% | 2448 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,953 psi | 54% | 2290 fps | 97.4% |
| ReloadSwiss RS 70 | 59.8 gr | 80% | 32,576 psi | 53% | 2293 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 35,549 psi | 58% | 2418 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 46,673 psi | 77% | 2411 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,176 psi | 66% | 2359 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 44,034 psi | 72% | 2434 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 90% | 38,261 psi | 63% | 2385 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 38,043 psi | 62% | 2290 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,941 psi | 61% | 2277 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,792 psi | 82% | 2477 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,875 psi | 74% | 2402 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 35,128 psi | 58% | 2257 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,220 psi | 68% | 2408 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,618 psi | 83% | 2507 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,573 psi | 80% | 2480 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,140 psi | 82% | 2392 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,105 psi | 69% | 2280 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,201 psi | 59% | 2224 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 40,437 psi | 66% | 2431 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 49,719 psi | 82% | 2395 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,401 psi | 83% | 2493 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,756 psi | 67% | 2359 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 48,298 psi | 79% | 2480 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 30,008 psi | 49% | 2234 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 36,376 psi | 60% | 2320 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 50,589 psi | 83% | 2379 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,717 psi | 77% | 2379 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,920 psi | 77% | 2392 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,783 psi | 64% | 2297 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 34,795 psi | 57% | 2270 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 38,218 psi | 63% | 2349 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 45,339 psi | 74% | 2392 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,389 psi | 56% | 2277 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 25,962 psi | 43% | 2136 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 98% | 47,703 psi | 78% | 2608 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,171 psi | 56% | 2247 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 35,578 psi | 58% | 2320 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,134 psi | 40% | 2142 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,298 psi | 79% | 2487 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 41,075 psi | 67% | 2405 fps | 95.5% |
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 102 powders for .338 Blaser Mag. loaded with the .338 | 250gr | Norma GTX. Alliant Reloder-26 delivers the highest muzzle velocity at 2,713 fps; across all powders the maximum-charge window runs from 1,555 fps to 2,713 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 59–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .338 Blaser Mag. with the .338 | 250gr | Norma GTX 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.