Load Specifications
Bullet Manufacturer:Swift
Bullet Weight:210 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:1:13.5
Load data in caliber 8.5 mm Messner Mag. with .338 | 210gr | Swift Scirocco 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-26 and Hodgdon Superformance.
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>> | 82% | 54,882 psi | 86% | 2799 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,043 psi | 88% | 2871 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 2913 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 55,245 psi | 87% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,941 psi | 88% | 2966 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,680 psi | 87% | 3058 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 82% | 57,464 psi | 90% | 2933 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,187 psi | 86% | 2887 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,826 psi | 89% | 3012 fps | 98.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 3005 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,360 psi | 85% | 3012 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,956 psi | 89% | 3009 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,014 psi | 88% | 2910 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,304 psi | 88% | 2936 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,507 psi | 89% | 3022 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,215 psi | 85% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,144 psi | 88% | 2999 fps | 98.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 3002 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2930 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,758 psi | 69% | 2854 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,911 psi | 84% | 3074 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,609 psi | 90% | 2953 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,936 psi | 77% | 2923 fps | 97.5% |
| Bofors RP3 | <<locked>> | 86% | 57,043 psi | 89% | 2930 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 3002 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 56,246 psi | 88% | 2917 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 86% | 57,377 psi | 90% | 2946 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,418 psi | 85% | 2966 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 54,215 psi | 85% | 2920 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 98% | 54,708 psi | 86% | 2949 fps | 96.6% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,305 psi | 90% | 2989 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,985 psi | 89% | 2943 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,824 psi | 86% | 2927 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,946 psi | 67% | 2887 fps | 96.6% |
| Hodgdon Superformance | <<locked>> | 90% | 54,433 psi | 85% | 2999 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,463 psi | 57% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,666 psi | 87% | 2890 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,650 psi | 86% | 2871 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,334 psi | 90% | 2907 fps | 99.5% |
| IMR 4350 | <<locked>> | 94% | 57,174 psi | 90% | 2949 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,534 psi | 85% | 2890 fps | 99.3% |
| IMR 4831 | <<locked>> | 94% | 56,246 psi | 88% | 2956 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,099 psi | 85% | 2910 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,246 psi | 88% | 2936 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2972 fps | 96.8% |
| Lovex S060 | <<locked>> | 82% | 56,260 psi | 88% | 2854 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,969 psi | 86% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,491 psi | 85% | 2884 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 55,753 psi | 87% | 2927 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,483 psi | 70% | 2762 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 56,289 psi | 88% | 2874 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,043 psi | 89% | 2871 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,593 psi | 87% | 2920 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,302 psi | 85% | 2946 fps | 98.1% |
| Norma MRPᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3087 fps | 99.6% |
| Norma URP | <<locked>> | 92% | 54,491 psi | 85% | 2949 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,376 psi | 88% | 2946 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,272 psi | 82% | 2989 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 94% | 56,884 psi | 89% | 3005 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,572 psi | 73% | 2861 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,028 psi | 58% | 1847 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,305 psi | 90% | 2933 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,435 psi | 90% | 3005 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,624 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,796 psi | 87% | 2989 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,273 psi | 85% | 3018 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,859 psi | 67% | 2881 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,811 psi | 89% | 2874 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,913 psi | 89% | 2923 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,955 psi | 86% | 2923 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 98% | 55,303 psi | 87% | 2982 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 56,246 psi | 88% | 2917 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,491 psi | 85% | 2884 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 54,969 psi | 86% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,753 psi | 87% | 2927 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,955 psi | 86% | 2933 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,043 psi | 88% | 2907 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,942 psi | 89% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,462 psi | 85% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,157 psi | 85% | 2838 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,824 psi | 86% | 2979 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 56,782 psi | 89% | 2799 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,840 psi | 89% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,782 psi | 89% | 2917 fps | 96.9% |
| Somchem S365 | <<locked>> | 96% | 57,435 psi | 90% | 3002 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,028 psi | 88% | 2959 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 82% | 57,479 psi | 90% | 2779 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,319 psi | 90% | 2828 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,566 psi | 90% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,607 psi | 86% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,681 psi | 89% | 2943 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,677 psi | 81% | 2877 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 84% | 55,724 psi | 87% | 2844 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,666 psi | 87% | 2946 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3009 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,956 psi | 89% | 3077 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,289 psi | 88% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,607 psi | 86% | 2966 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,542 psi | 71% | 2992 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,086 psi | 88% | 2910 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 2953 fps | 98.5% |
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% | 51,285 psi | 80% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,095 psi | 77% | 2759 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 33,272 psi | 52% | 2523 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 48,573 psi | 76% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,086 psi | 58% | 2628 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 98% | 51,909 psi | 81% | 2995 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 54,099 psi | 85% | 2881 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,905 psi | 72% | 2733 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,089 psi | 64% | 2720 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 96% | 47,616 psi | 75% | 2881 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,618 psi | 79% | 2953 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,147 psi | 64% | 2720 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,369 psi | 73% | 2759 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,588 psi | 78% | 2828 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,085 psi | 57% | 2635 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,915 psi | 64% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,698 psi | 64% | 2713 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,886 psi | 64% | 2766 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,455 psi | 41% | 2388 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,952 psi | 50% | 2562 fps | 95.4% |
| Alliant Reloder-26 | 77.3 gr | 82% | 30,197 psi | 47% | 2559 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,838 psi | 84% | 2897 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,335 psi | 63% | 2749 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 46,673 psi | 73% | 2769 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,886 psi | 64% | 2766 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 41,191 psi | 65% | 2644 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 47,065 psi | 74% | 2782 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 38,986 psi | 61% | 2671 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 41,901 psi | 66% | 2694 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 96% | 51,097 psi | 80% | 2890 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,937 psi | 78% | 2867 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,692 psi | 53% | 2530 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,329 psi | 80% | 2874 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,205 psi | 63% | 2822 fps | 95.6% |
| Hodgdon Superformance | 77.8 gr | 80% | 37,942 psi | 59% | 2680 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,122 psi | 43% | 1611 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,156 psi | 82% | 2838 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,298 psi | 76% | 2766 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,604 psi | 79% | 2799 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 36,840 psi | 58% | 2569 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,482 psi | 67% | 2671 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 35,592 psi | 56% | 2579 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 50,879 psi | 80% | 2858 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,647 psi | 78% | 2825 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 96% | 45,484 psi | 71% | 2851 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 53,011 psi | 83% | 2805 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,602 psi | 76% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,030 psi | 63% | 2621 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 38,305 psi | 60% | 2602 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 32,242 psi | 51% | 2497 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 52,765 psi | 83% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,432 psi | 84% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,950 psi | 77% | 2815 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,495 psi | 65% | 2710 fps | 95.2% |
| Norma MRP | <<locked>> | 88% | 37,347 psi | 59% | 2713 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,854 psi | 58% | 2621 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 49,110 psi | 77% | 2835 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,208 psi | 71% | 2858 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 35,766 psi | 56% | 2608 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 96% | 40,277 psi | 63% | 2733 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 43% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,123 psi | 74% | 2766 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,650 psi | 84% | 2949 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,453 psi | 68% | 2818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,695 psi | 57% | 2644 fps | 98.1% |
| ReloadSwiss RS 70 | 74.7 gr | 80% | 35,694 psi | 56% | 2648 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,202 psi | 58% | 2740 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 50,430 psi | 79% | 2776 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,976 psi | 69% | 2717 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,324 psi | 71% | 2756 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 39,668 psi | 62% | 2694 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,191 psi | 65% | 2644 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,030 psi | 63% | 2621 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 48,602 psi | 76% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,305 psi | 60% | 2602 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,150 psi | 71% | 2772 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,576 psi | 82% | 2854 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,664 psi | 84% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,382 psi | 71% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,189 psi | 61% | 2566 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,945 psi | 66% | 2746 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 53,287 psi | 84% | 2749 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,237 psi | 69% | 2713 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,806 psi | 78% | 2805 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 33,344 psi | 52% | 2579 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 37,898 psi | 59% | 2625 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 54,230 psi | 85% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,691 psi | 79% | 2740 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,734 psi | 80% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,308 psi | 66% | 2644 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,305 psi | 60% | 2621 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 39,682 psi | 62% | 2654 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 49,066 psi | 77% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,739 psi | 59% | 2621 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 29,109 psi | 46% | 2467 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 96% | 49,763 psi | 78% | 2953 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,391 psi | 59% | 2589 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,131 psi | 61% | 2677 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,005 psi | 39% | 2418 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,576 psi | 82% | 2861 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,496 psi | 67% | 2717 fps | 95.7% |
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 101 powders for 8.5 mm Messner Mag. loaded with the .338 | 210gr | Swift Scirocco. Norma MRP delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,087 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:13.5 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for 8.5 mm Messner Mag. with the .338 | 210gr | Swift Scirocco 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.