Load Specifications
Bullet Manufacturer:Barnes
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:1:13.0
Load data in caliber 8.5 mm Messner Mag. with .338 | 210gr | Barnes TTSX BT bullet and 108 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 2495 | <<locked>> | 84% | 55,579 psi | 87% | 2815 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,696 psi | 90% | 2894 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,763 psi | 80% | 2871 fps | 99.4% |
| Accurate 4064 | <<locked>> | 86% | 56,043 psi | 88% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,072 psi | 89% | 2982 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,448 psi | 87% | 2904 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,840 psi | 89% | 2910 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,505 psi | 85% | 2972 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,359 psi | 82% | 2966 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,711 psi | 90% | 2897 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,202 psi | 88% | 3038 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,592 psi | 86% | 2969 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,276 psi | 90% | 2930 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,027 psi | 85% | 2900 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,215 psi | 85% | 2986 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,535 psi | 87% | 3015 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 3015 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 2959 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,790 psi | 75% | 2890 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,785 psi | 65% | 2812 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,172 psi | 86% | 3094 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,521 psi | 87% | 2923 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,543 psi | 73% | 2877 fps | 96.8% |
| Bofors RP3 | <<locked>> | 86% | 54,520 psi | 85% | 2897 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 2959 fps | 97.9% |
| Bofors RP7 | <<locked>> | 90% | 54,186 psi | 85% | 2881 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,740 psi | 90% | 2930 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 55,114 psi | 86% | 2913 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 55,767 psi | 87% | 2986 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 55,593 psi | 87% | 2940 fps | 98.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,086 psi | 88% | 2966 fps | 96.7% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,969 psi | 86% | 2949 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 82% | 56,057 psi | 88% | 2910 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,520 psi | 85% | 2907 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,492 psi | 89% | 2953 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,057 psi | 88% | 3025 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,085 psi | 57% | 1795 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,290 psi | 90% | 2913 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,695 psi | 89% | 2884 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,202 psi | 88% | 2890 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,390 psi | 87% | 2874 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 55,056 psi | 86% | 2913 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,999 psi | 88% | 2910 fps | 99.3% |
| IMR 4831 | <<locked>> | 96% | 57,334 psi | 90% | 2969 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,463 psi | 87% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,099 psi | 85% | 2897 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 49,632 psi | 78% | 2930 fps | 96.1% |
| IMR 8208 XBR | <<locked>> | 82% | 57,711 psi | 90% | 2897 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,782 psi | 87% | 2874 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,447 psi | 85% | 2825 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,304 psi | 88% | 2884 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,695 psi | 87% | 2904 fps | 99.9% |
| Lovex S070 | <<locked>> | 94% | 57,072 psi | 89% | 2946 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,916 psi | 66% | 2717 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 57,609 psi | 90% | 2894 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,911 psi | 86% | 2841 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,000 psi | 89% | 2943 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,883 psi | 88% | 2969 fps | 98.3% |
| Norma MRPᴾ | <<locked>> | 100% | 54,099 psi | 85% | 3045 fps | 99.4% |
| Norma URP | <<locked>> | 94% | 55,782 psi | 87% | 2969 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,230 psi | 85% | 2917 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,705 psi | 78% | 2940 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 94% | 54,607 psi | 86% | 2972 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,164 psi | 69% | 2815 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,753 psi | 58% | 1837 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,027 psi | 86% | 2897 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,984 psi | 86% | 2969 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,129 psi | 86% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,913 psi | 89% | 3009 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,608 psi | 87% | 3038 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,596 psi | 64% | 2825 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 84% | 54,592 psi | 86% | 2841 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,607 psi | 86% | 2890 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,391 psi | 88% | 2943 fps | 97.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 3005 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 54,186 psi | 85% | 2881 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,695 psi | 87% | 2904 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,782 psi | 87% | 2874 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,304 psi | 88% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,072 psi | 89% | 2946 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,478 psi | 89% | 2956 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,826 psi | 89% | 2910 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,595 psi | 90% | 2927 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,172 psi | 86% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,072 psi | 88% | 2776 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,622 psi | 87% | 2858 fps | 99.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,159 psi | 88% | 2999 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 54,752 psi | 86% | 2772 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,521 psi | 89% | 2894 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,520 psi | 85% | 2884 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,607 psi | 86% | 2881 fps | 96.3% |
| Somchem S365 | <<locked>> | 96% | 54,737 psi | 86% | 2966 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,261 psi | 90% | 2976 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 55,709 psi | 87% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,013 psi | 86% | 2802 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,579 psi | 87% | 2822 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,101 psi | 88% | 2861 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,331 psi | 85% | 2907 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,313 psi | 77% | 2838 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 86% | 57,232 psi | 90% | 2864 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,058 psi | 89% | 2969 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 2969 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,563 psi | 86% | 3038 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,230 psi | 85% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,956 psi | 88% | 2986 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,004 psi | 67% | 2946 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,114 psi | 85% | 2884 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,795 psi | 84% | 2913 fps | 98.1% |
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% | 48,660 psi | 76% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,210 psi | 74% | 2723 fps | 97.5% |
| Accurate 3100 | <<locked>> | 88% | 33,359 psi | 52% | 2530 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 46,108 psi | 72% | 2723 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,795 psi | 55% | 2579 fps | 97.7% |
| ADI AR 2206H | <<locked>> | 80% | 52,054 psi | 82% | 2851 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,251 psi | 69% | 2703 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 41,945 psi | 66% | 2736 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 98% | 48,776 psi | 76% | 2900 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,230 psi | 85% | 2848 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,617 psi | 76% | 2917 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 41,916 psi | 66% | 2736 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,483 psi | 70% | 2726 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,514 psi | 74% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,447 psi | 54% | 2595 fps | 97.9% |
| Alliant Reloder-17 | 72.3 gr | 80% | 38,972 psi | 61% | 2723 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,423 psi | 65% | 2730 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,408 psi | 65% | 2779 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 24,889 psi | 39% | 2339 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,198 psi | 50% | 2572 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 84% | 30,458 psi | 48% | 2569 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,822 psi | 81% | 2867 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 40,843 psi | 64% | 2762 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 44,367 psi | 70% | 2733 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,408 psi | 65% | 2779 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 39,320 psi | 62% | 2605 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,983 psi | 85% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,005 psi | 71% | 2746 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 37,072 psi | 58% | 2631 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 40,103 psi | 63% | 2654 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 96% | 48,878 psi | 77% | 2848 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,242 psi | 80% | 2890 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 52,634 psi | 82% | 2861 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,778 psi | 50% | 2487 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,298 psi | 77% | 2844 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 38,798 psi | 61% | 2703 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,890 psi | 42% | 1604 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,459 psi | 79% | 2812 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,214 psi | 83% | 2838 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,514 psi | 73% | 2736 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,849 psi | 77% | 2766 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 37,478 psi | 59% | 2585 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,944 psi | 64% | 2638 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 33,605 psi | 53% | 2533 fps | 97.4% |
| IMR 4895 | <<locked>> | 80% | 48,776 psi | 76% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 47,703 psi | 75% | 2789 fps | 95% |
| IMR 7828 SSC | <<locked>> | 98% | 46,456 psi | 73% | 2871 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 54,230 psi | 85% | 2848 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,083 psi | 82% | 2822 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,169 psi | 80% | 2776 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,485 psi | 73% | 2733 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,247 psi | 60% | 2585 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 36,361 psi | 57% | 2559 fps | 95.6% |
| Lovex S071 | <<locked>> | 92% | 32,184 psi | 50% | 2500 fps | 95% |
| Norma 201 | <<locked>> | 80% | 50,720 psi | 79% | 2792 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,517 psi | 81% | 2792 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,891 psi | 73% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,453 psi | 67% | 2730 fps | 95.3% |
| Norma MRP | <<locked>> | 90% | 37,956 psi | 59% | 2730 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,882 psi | 55% | 2579 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 47,181 psi | 74% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,195 psi | 72% | 2874 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 33,852 psi | 53% | 2562 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 98% | 41,017 psi | 64% | 2749 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,398 psi | 43% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,266 psi | 71% | 2730 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,242 psi | 80% | 2913 fps | 100% |
| ReloadSwiss RS 60 | 72.3 gr | 80% | 41,524 psi | 65% | 2782 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,650 psi | 54% | 2598 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 34,011 psi | 53% | 2605 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 37,724 psi | 59% | 2753 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 48,254 psi | 76% | 2743 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,713 psi | 65% | 2677 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 46,412 psi | 73% | 2772 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 90% | 40,292 psi | 63% | 2710 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 39,320 psi | 62% | 2605 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,247 psi | 60% | 2585 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,083 psi | 82% | 2822 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,485 psi | 73% | 2733 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,361 psi | 57% | 2559 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,018 psi | 67% | 2733 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,895 psi | 83% | 2851 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,473 psi | 79% | 2818 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,880 psi | 81% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,671 psi | 68% | 2595 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,347 psi | 59% | 2526 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 39,900 psi | 63% | 2703 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 51,445 psi | 81% | 2726 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,663 psi | 83% | 2838 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,293 psi | 66% | 2680 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 50,908 psi | 80% | 2822 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 31,357 psi | 49% | 2533 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 38,261 psi | 60% | 2638 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 52,460 psi | 82% | 2713 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,588 psi | 76% | 2710 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,733 psi | 76% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,292 psi | 63% | 2608 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,376 psi | 57% | 2582 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 40,364 psi | 63% | 2671 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 47,123 psi | 74% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,824 psi | 56% | 2582 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 27,021 psi | 42% | 2411 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 96% | 47,471 psi | 74% | 2907 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,607 psi | 56% | 2552 fps | 99.5% |
| Winchester 760 | 70.8 gr | 80% | 37,217 psi | 58% | 2635 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,918 psi | 39% | 2418 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,415 psi | 79% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,453 psi | 68% | 2736 fps | 95.8% |
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 108 powders for 8.5 mm Messner Mag. loaded with the .338 | 210gr | Barnes TTSX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,795 fps to 3,094 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 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 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-19 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 8.5 mm Messner Mag. with the .338 | 210gr | Barnes TTSX BT 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.