Load Specifications
Load data in caliber 8.5 mm Messner Mag. with .338 | 254gr | Peregrine VLR-5 bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Vihtavuori N560 and Norma MRP.
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% | 56,840 psi | 89% | 2549 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,752 psi | 86% | 2595 fps | 99.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 2694 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,421 psi | 90% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,071 psi | 86% | 2680 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,056 psi | 86% | 2789 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 84% | 54,259 psi | 85% | 2602 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,130 psi | 88% | 2736 fps | 99.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,319 psi | 90% | 2789 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 41,640 psi | 65% | 2520 fps | 96.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,564 psi | 57% | 2480 fps | 97.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,566 psi | 90% | 2772 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,085 psi | 86% | 2621 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,274 psi | 87% | 2644 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,999 psi | 88% | 2733 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,421 psi | 90% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,376 psi | 87% | 2723 fps | 99.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2782 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,505 psi | 84% | 2703 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,209 psi | 72% | 2654 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,740 psi | 90% | 2848 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 2703 fps | 96.3% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,793 psi | 81% | 2717 fps | 99.2% |
| Bofors RP3 | <<locked>> | 84% | 55,695 psi | 87% | 2635 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,076 psi | 66% | 2589 fps | 97% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2782 fps | 99.7% |
| Bofors RP7 | <<locked>> | 88% | 55,100 psi | 86% | 2635 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,934 psi | 72% | 2605 fps | 97.9% |
| Hodgdon H380 | <<locked>> | 84% | 56,231 psi | 88% | 2657 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,392 psi | 90% | 2736 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 56,898 psi | 89% | 2697 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 98% | 57,551 psi | 90% | 2733 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,347 psi | 88% | 2717 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,289 psi | 88% | 2654 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,624 psi | 90% | 2684 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,252 psi | 71% | 2703 fps | 99.1% |
| Hodgdon Superformance | <<locked>> | 88% | 53,693 psi | 84% | 2723 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 57% | 1617 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,145 psi | 90% | 2628 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,014 psi | 88% | 2621 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 56,376 psi | 88% | 2671 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,913 psi | 89% | 2661 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 55,506 psi | 87% | 2674 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,710 psi | 89% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,361 psi | 87% | 2667 fps | 98.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,766 psi | 86% | 2766 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 57,188 psi | 90% | 2618 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,971 psi | 89% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,868 psi | 86% | 2651 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,036 psi | 74% | 2559 fps | 99.8% |
| Norma 203B | <<locked>> | 82% | 54,578 psi | 86% | 2628 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,246 psi | 90% | 2726 fps | 99.5% |
| Norma MRP | <<locked>> | 98% | 56,246 psi | 88% | 2808 fps | 100% |
| Norma URP | <<locked>> | 92% | 57,493 psi | 90% | 2717 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,361 psi | 87% | 2657 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,405 psi | 87% | 2785 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 56,188 psi | 88% | 2723 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,371 psi | 77% | 2667 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,985 psi | 88% | 2648 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,898 psi | 89% | 2740 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,897 psi | 86% | 2703 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,217 psi | 90% | 2785 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,092 psi | 71% | 2697 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 82% | 55,666 psi | 87% | 2582 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,028 psi | 88% | 2635 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,682 psi | 90% | 2703 fps | 99% |
| Rottweil R 905 | <<locked>> | 96% | 54,636 psi | 86% | 2710 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 88% | 55,100 psi | 86% | 2635 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,971 psi | 89% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,188 psi | 90% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,868 psi | 86% | 2651 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,740 psi | 90% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,768 psi | 89% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,478 psi | 89% | 2612 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,172 psi | 85% | 2707 fps | 99.5% |
| Somchem S355 | <<locked>> | 86% | 55,840 psi | 88% | 2628 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,724 psi | 87% | 2651 fps | 98.2% |
| Somchem S365 | <<locked>> | 94% | 57,130 psi | 90% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,274 psi | 87% | 2687 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 56,347 psi | 88% | 2539 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,318 psi | 88% | 2556 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,276 psi | 90% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,999 psi | 88% | 2661 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 2664 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 82% | 54,447 psi | 85% | 2556 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,795 psi | 86% | 2664 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,956 psi | 88% | 2726 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,405 psi | 88% | 2805 fps | 98.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,080 psi | 75% | 2664 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,390 psi | 87% | 2625 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,392 psi | 90% | 2736 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,168 psi | 77% | 2776 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,477 psi | 87% | 2684 fps | 99.5% |
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% | 53,200 psi | 83% | 2507 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,242 psi | 80% | 2543 fps | 99.4% |
| Accurate 3100 | <<locked>> | 80% | 28,297 psi | 44% | 2182 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 50,517 psi | 79% | 2520 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,812 psi | 61% | 2425 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 92% | 44,541 psi | 70% | 2615 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 47,819 psi | 75% | 2510 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 35,302 psi | 55% | 2362 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 90% | 40,886 psi | 64% | 2510 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 98% | 38,986 psi | 61% | 2464 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 32,140 psi | 50% | 2365 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,679 psi | 84% | 2720 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,530 psi | 76% | 2530 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,692 psi | 81% | 2595 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,985 psi | 60% | 2438 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,178 psi | 68% | 2549 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 35,186 psi | 55% | 2362 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 35,259 psi | 55% | 2408 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,572 psi | 43% | 2218 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 27,528 psi | 43% | 2231 fps | 95.6% |
| Alliant Reloder-26 | 69.7 gr | 80% | 29,472 psi | 46% | 2329 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 53,040 psi | 83% | 2651 fps | 95.5% |
| Bofors RP15 | <<locked>> | 88% | 34,954 psi | 55% | 2398 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 48,921 psi | 77% | 2543 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 36,709 psi | 58% | 2474 fps | 95.2% |
| Bofors RP5 | <<locked>> | 86% | 35,259 psi | 55% | 2408 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 42,714 psi | 67% | 2434 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 37,318 psi | 58% | 2431 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 49,255 psi | 77% | 2559 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 40,915 psi | 64% | 2474 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 44,019 psi | 69% | 2490 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 41,031 psi | 64% | 2464 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 90% | 42,931 psi | 67% | 2503 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,404 psi | 55% | 2333 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,882 psi | 84% | 2635 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 34,882 psi | 55% | 2467 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 39,871 psi | 62% | 2490 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 43% | 1444 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,328 psi | 79% | 2536 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,678 psi | 83% | 2572 fps | 99.8% |
| IMR 4350 | <<locked>> | 80% | 38,493 psi | 60% | 2375 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,396 psi | 70% | 2467 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 37,333 psi | 59% | 2382 fps | 99.6% |
| IMR 4895 | <<locked>> | 80% | 53,055 psi | 83% | 2618 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 40,321 psi | 63% | 2415 fps | 95% |
| IMR 7828 SSC | <<locked>> | 90% | 39,175 psi | 61% | 2487 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 50,604 psi | 79% | 2530 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,640 psi | 65% | 2415 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 39,856 psi | 62% | 2402 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 27,818 psi | 44% | 2172 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 51,010 psi | 80% | 2579 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,014 psi | 60% | 2405 fps | 96.1% |
| Norma MRP | 69.4 gr | 82% | 32,068 psi | 50% | 2359 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 38,653 psi | 61% | 2421 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 80% | 51,735 psi | 81% | 2608 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 38,624 psi | 61% | 2490 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,608 psi | 59% | 2415 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 90% | 34,142 psi | 54% | 2379 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 44% | 1480 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,226 psi | 77% | 2546 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,919 psi | 72% | 2589 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,682 psi | 61% | 2444 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,521 psi | 59% | 2461 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 31,676 psi | 50% | 2385 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 52,286 psi | 82% | 2536 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,861 psi | 72% | 2493 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 39,175 psi | 61% | 2398 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 82% | 34,185 psi | 54% | 2343 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 42,714 psi | 67% | 2434 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,640 psi | 65% | 2415 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 50,604 psi | 79% | 2530 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,856 psi | 62% | 2402 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,384 psi | 74% | 2549 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,137 psi | 74% | 2392 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,756 psi | 64% | 2369 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 33,895 psi | 53% | 2339 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 46,137 psi | 72% | 2490 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 42,685 psi | 67% | 2441 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 35,230 psi | 55% | 2382 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 32,489 psi | 51% | 2277 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 52,779 psi | 83% | 2493 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,866 psi | 83% | 2510 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,092 psi | 69% | 2425 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,089 psi | 63% | 2415 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 34,185 psi | 54% | 2313 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 51,184 psi | 80% | 2513 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,581 psi | 62% | 2425 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,676 psi | 48% | 2287 fps | 98.7% |
| Vihtavuori N560 | 74.4 gr | 88% | 39,914 psi | 63% | 2520 fps | 95% |
| Vihtavuori N565 | <<locked>> | 94% | 39,044 psi | 61% | 2500 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,189 psi | 61% | 2388 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,089 psi | 64% | 2477 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,279 psi | 38% | 2211 fps | 98.4% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,347 psi | 57% | 2365 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 99 powders for 8.5 mm Messner Mag. loaded with the .338 | 254gr | Peregrine VLR-5. Alliant Reloder-26 delivers the highest muzzle velocity at 2,848 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,848 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 254.0 gr projectile in 0.338" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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-26, Vihtavuori N560, Norma MRP rank at the top here: for 8.5 mm Messner Mag. with the .338 | 254gr | Peregrine VLR-5 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, ReloadSwiss RS 80, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.