Load Specifications
Bullet:.338 | 250gr | CutEdge LZR
Bullet Manufacturer:Cutting Edge
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:8.5 mm Messner Mag. load data
Case Length (l3):2.508"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:106 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:25.6"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:9.5
Load data in caliber 8.5 mm Messner Mag. with .338 | 250gr | CutEdge LZR bullet and 100 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.
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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>> | 82% | 54,708 psi | 86% | 2536 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,260 psi | 88% | 2621 fps | 99.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,853 psi | 84% | 2667 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 55,129 psi | 86% | 2592 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,260 psi | 88% | 2707 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 55,100 psi | 86% | 2812 fps | 98.8% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,101 psi | 88% | 2812 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 86% | 55,593 psi | 87% | 2631 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,435 psi | 90% | 2762 fps | 99.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 2759 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 34,867 psi | 55% | 2441 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,056 psi | 86% | 2753 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,362 psi | 88% | 2648 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,768 psi | 89% | 2674 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,159 psi | 90% | 2759 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,723 psi | 86% | 2733 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,608 psi | 89% | 2749 fps | 99.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2753 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,633 psi | 79% | 2680 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,932 psi | 69% | 2625 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,389 psi | 85% | 2818 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,153 psi | 77% | 2684 fps | 98.6% |
| Bofors RP3 | <<locked>> | 86% | 57,276 psi | 90% | 2667 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2753 fps | 99.3% |
| Bofors RP7 | <<locked>> | 90% | 56,623 psi | 89% | 2664 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 43,685 psi | 68% | 2566 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 86% | 57,638 psi | 90% | 2687 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,781 psi | 86% | 2710 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 54,824 psi | 86% | 2677 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 54,969 psi | 86% | 2703 fps | 97.9% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,638 psi | 90% | 2743 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,319 psi | 90% | 2680 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,492 psi | 87% | 2667 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,091 psi | 68% | 2664 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 90% | 55,027 psi | 86% | 2753 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,332 psi | 57% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,173 psi | 88% | 2631 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,085 psi | 86% | 2612 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,201 psi | 85% | 2602 fps | 99.8% |
| IMR 4350 | <<locked>> | 94% | 57,580 psi | 90% | 2697 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,926 psi | 86% | 2641 fps | 99.8% |
| IMR 4831 | <<locked>> | 94% | 56,507 psi | 89% | 2697 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,607 psi | 86% | 2651 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,739 psi | 89% | 2694 fps | 98.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,228 psi | 82% | 2733 fps | 98.1% |
| Lovex S060 | <<locked>> | 82% | 56,623 psi | 89% | 2595 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,317 psi | 87% | 2605 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,694 psi | 86% | 2635 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 56,144 psi | 88% | 2677 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,599 psi | 70% | 2530 fps | 99.5% |
| Norma 201 | <<locked>> | 82% | 56,492 psi | 89% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,276 psi | 90% | 2605 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,028 psi | 88% | 2661 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,781 psi | 86% | 2700 fps | 99.1% |
| Norma MRPᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2835 fps | 100% |
| Norma URP | <<locked>> | 92% | 55,027 psi | 86% | 2694 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,898 psi | 89% | 2687 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,562 psi | 82% | 2749 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 94% | 57,290 psi | 90% | 2749 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2631 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,711 psi | 90% | 2677 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,128 psi | 85% | 2720 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,057 psi | 88% | 2733 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,679 psi | 86% | 2762 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,728 psi | 67% | 2654 fps | 99% |
| Rottweil R 902 | <<locked>> | 84% | 57,188 psi | 90% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,145 psi | 90% | 2661 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,288 psi | 87% | 2677 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 98% | 55,782 psi | 87% | 2736 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 90% | 56,623 psi | 89% | 2664 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,694 psi | 86% | 2635 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,317 psi | 87% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,144 psi | 88% | 2677 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,288 psi | 87% | 2674 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,434 psi | 88% | 2648 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,435 psi | 90% | 2539 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,795 psi | 86% | 2500 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,360 psi | 85% | 2592 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,303 psi | 87% | 2730 fps | 99.4% |
| Somchem S335 | <<locked>> | 82% | 57,029 psi | 89% | 2539 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,174 psi | 90% | 2657 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,971 psi | 89% | 2674 fps | 98% |
| Somchem S365 | <<locked>> | 94% | 54,186 psi | 85% | 2694 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,231 psi | 88% | 2710 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 54,259 psi | 85% | 2526 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,476 psi | 85% | 2543 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,882 psi | 86% | 2585 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,261 psi | 90% | 2687 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,098 psi | 82% | 2638 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 84% | 55,999 psi | 88% | 2589 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,057 psi | 88% | 2694 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 2749 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 2828 fps | 98.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 45,382 psi | 71% | 2628 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,898 psi | 89% | 2657 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,998 psi | 86% | 2713 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,629 psi | 72% | 2746 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,623 psi | 89% | 2654 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 2710 fps | 99.4% |
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 51,097 psi | 80% | 2493 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,255 psi | 77% | 2520 fps | 99% |
| Accurate 3100 | <<locked>> | 82% | 28,848 psi | 45% | 2208 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 48,486 psi | 76% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,014 psi | 58% | 2402 fps | 99.3% |
| Accurate High Country | <<locked>> | 88% | 38,696 psi | 61% | 2523 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 94% | 45,281 psi | 71% | 2638 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 46,311 psi | 73% | 2493 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 36,158 psi | 57% | 2388 fps | 95% |
| ADI AR 2213 | <<locked>> | 92% | 41,829 psi | 66% | 2536 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 98% | 32,692 psi | 51% | 2385 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,213 psi | 80% | 2697 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,702 psi | 73% | 2513 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,850 psi | 78% | 2579 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,376 psi | 57% | 2415 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,205 psi | 65% | 2526 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 35,984 psi | 56% | 2388 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 88% | 35,911 psi | 56% | 2431 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,310 psi | 41% | 2192 fps | 97.9% |
| Alliant Reloder-25 | <<locked>> | 86% | 28,123 psi | 44% | 2254 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 27,963 psi | 44% | 2293 fps | 96.4% |
| Bofors RP15 | <<locked>> | 90% | 35,447 psi | 56% | 2421 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,862 psi | 73% | 2523 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 35,911 psi | 56% | 2431 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 41,162 psi | 65% | 2415 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 98% | 40,814 psi | 64% | 2510 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 47,311 psi | 74% | 2539 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 39,088 psi | 61% | 2448 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 42,221 psi | 66% | 2467 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 92% | 44,846 psi | 70% | 2543 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 43,918 psi | 69% | 2526 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,750 psi | 53% | 2310 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,750 psi | 81% | 2618 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 35,360 psi | 55% | 2484 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 38,130 psi | 60% | 2464 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 42% | 1440 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,649 psi | 83% | 2585 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,733 psi | 76% | 2523 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,836 psi | 80% | 2552 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 37,028 psi | 58% | 2352 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,670 psi | 67% | 2441 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 35,694 psi | 56% | 2359 fps | 99.1% |
| IMR 4895 | <<locked>> | 80% | 51,140 psi | 80% | 2602 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 44,063 psi | 69% | 2490 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 42,598 psi | 67% | 2566 fps | 95.8% |
| Lovex S060 | <<locked>> | 80% | 53,345 psi | 84% | 2549 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,747 psi | 76% | 2516 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,074 psi | 63% | 2395 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 38,319 psi | 60% | 2379 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 28,108 psi | 44% | 2192 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,953 psi | 83% | 2566 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,867 psi | 84% | 2562 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,182 psi | 77% | 2566 fps | 100% |
| Norma 204 | <<locked>> | 80% | 36,376 psi | 57% | 2375 fps | 95.1% |
| Norma MRP | <<locked>> | 84% | 32,576 psi | 51% | 2382 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 36,970 psi | 58% | 2398 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,574 psi | 78% | 2589 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 39,494 psi | 62% | 2513 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 35,911 psi | 56% | 2392 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 92% | 34,882 psi | 55% | 2398 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,586 psi | 43% | 1476 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,239 psi | 74% | 2526 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,859 psi | 69% | 2572 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,840 psi | 58% | 2421 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 35,824 psi | 56% | 2431 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 32,343 psi | 51% | 2408 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 50,401 psi | 79% | 2520 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,034 psi | 69% | 2474 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 40,190 psi | 63% | 2425 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 84% | 34,751 psi | 54% | 2365 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,162 psi | 65% | 2415 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,074 psi | 63% | 2395 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 48,747 psi | 76% | 2516 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,319 psi | 60% | 2379 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,440 psi | 71% | 2530 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,939 psi | 83% | 2598 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,983 psi | 85% | 2497 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,600 psi | 71% | 2382 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,160 psi | 61% | 2343 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 36,912 psi | 58% | 2415 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 53,519 psi | 84% | 2497 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,367 psi | 70% | 2474 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 43,627 psi | 68% | 2464 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 33,489 psi | 52% | 2359 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 33,098 psi | 52% | 2300 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 50,923 psi | 80% | 2484 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,039 psi | 80% | 2500 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,395 psi | 66% | 2408 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,421 psi | 60% | 2395 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 34,853 psi | 55% | 2336 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 49,298 psi | 77% | 2500 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,826 psi | 59% | 2398 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 29,037 psi | 46% | 2260 fps | 97.9% |
| Vihtavuori N560 | <<locked>> | 92% | 43,613 psi | 68% | 2598 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 98% | 42,366 psi | 66% | 2572 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,507 psi | 59% | 2369 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,276 psi | 62% | 2451 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,134 psi | 36% | 2172 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,852 psi | 83% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 37,202 psi | 58% | 2388 fps | 95.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 100 powders for 8.5 mm Messner Mag. loaded with the .338 | 250gr | CutEdge LZR. Norma MRP delivers the highest muzzle velocity at 2,835 fps; across all powders the maximum-charge window runs from 1,614 fps to 2,835 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.