Load Specifications
Load data in caliber 7.5 x 55 Swiss with .306 | 160gr | Peregrine VLR-4 bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 47,442 psi | 86% | 2723 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 48,950 psi | 89% | 2792 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 47,152 psi | 86% | 2782 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 46,746 psi | 85% | 2802 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 47,137 psi | 86% | 2825 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,714 psi | 78% | 2825 fps | 98% |
| ADI AR 2206H | <<locked>> | 90% | 49,864 psi | 90% | 2864 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 47,718 psi | 87% | 2808 fps | 99% |
| ADI Benchmark 8208 | <<locked>> | 88% | 49,400 psi | 90% | 2822 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 48,457 psi | 88% | 2799 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 47,079 psi | 85% | 2867 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 49,139 psi | 89% | 2969 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 49,574 psi | 90% | 2877 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 47,834 psi | 87% | 2736 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 47,427 psi | 86% | 2848 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,381 psi | 79% | 2835 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 98% | 46,818 psi | 85% | 2936 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 49,400 psi | 90% | 2877 fps | 99% |
| Bofors RP3 | <<locked>> | 96% | 49,705 psi | 90% | 2890 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 86% | 48,631 psi | 88% | 2762 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 47,558 psi | 86% | 2848 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 49,168 psi | 89% | 2940 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 46,717 psi | 85% | 2772 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 47,456 psi | 86% | 2799 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 48,196 psi | 87% | 2848 fps | 98.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 46,818 psi | 85% | 2881 fps | 96% |
| Hodgdon H4895 | <<locked>> | 88% | 47,195 psi | 86% | 2828 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,508 psi | 72% | 2717 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 48,617 psi | 88% | 2904 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,127 psi | 62% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 48,443 psi | 88% | 2828 fps | 99.7% |
| IMR 3031 | <<locked>> | 90% | 49,037 psi | 89% | 2858 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 47,137 psi | 86% | 2789 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 90% | 47,993 psi | 87% | 2762 fps | 95.9% |
| IMR 4198 | <<locked>> | 82% | 48,617 psi | 88% | 2697 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,944 psi | 74% | 2769 fps | 97.6% |
| IMR 4895 | <<locked>> | 92% | 48,573 psi | 88% | 2881 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 49,400 psi | 90% | 2822 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 48,588 psi | 88% | 2799 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 48,341 psi | 88% | 2838 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 47,340 psi | 86% | 2743 fps | 99.3% |
| Lovex S062 | <<locked>> | 94% | 49,414 psi | 90% | 2838 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,646 psi | 88% | 2825 fps | 97.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 45,788 psi | 83% | 2799 fps | 95.9% |
| Norma 201 | <<locked>> | 90% | 48,530 psi | 88% | 2808 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 48,733 psi | 88% | 2815 fps | 100% |
| Norma 203B | <<locked>> | 94% | 49,632 psi | 90% | 2887 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 43,221 psi | 78% | 2822 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 94% | 49,821 psi | 90% | 2910 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 42,786 psi | 78% | 2808 fps | 95.9% |
| Ramshot TAC | <<locked>> | 88% | 49,835 psi | 90% | 2831 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 48,544 psi | 88% | 2851 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 47,297 psi | 86% | 2769 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,519 psi | 63% | 1765 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 49,110 psi | 89% | 2808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 48,863 psi | 89% | 2828 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 46,731 psi | 85% | 2907 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 46,746 psi | 85% | 2943 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 42,815 psi | 78% | 2844 fps | 97.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 44,425 psi | 81% | 2867 fps | 97.2% |
| Rottweil R 901 | <<locked>> | 88% | 49,414 psi | 90% | 2792 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 48,762 psi | 88% | 2802 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 49,255 psi | 89% | 2874 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,646 psi | 88% | 2825 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 90% | 48,341 psi | 88% | 2838 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 49,414 psi | 90% | 2838 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 45,788 psi | 83% | 2799 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 48,617 psi | 88% | 2769 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 48,109 psi | 87% | 2890 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 48,486 psi | 88% | 2749 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 47,297 psi | 86% | 2799 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 48,312 psi | 88% | 2835 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 47,732 psi | 87% | 2710 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 47,268 psi | 86% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 48,805 psi | 89% | 2776 fps | 96.2% |
| Somchem S321 | <<locked>> | 84% | 46,804 psi | 85% | 2802 fps | 99.9% |
| Somchem S335 | <<locked>> | 90% | 49,850 psi | 90% | 2756 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 47,108 psi | 85% | 2799 fps | 99.3% |
| Somchem S355 | <<locked>> | 96% | 47,253 psi | 86% | 2831 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,363 psi | 70% | 2772 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 84% | 47,805 psi | 87% | 2684 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 47,761 psi | 87% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 47,935 psi | 87% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 49,342 psi | 90% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 48,472 psi | 88% | 2812 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,818 psi | 83% | 2822 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 88% | 49,777 psi | 90% | 2822 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 47,514 psi | 86% | 2792 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,657 psi | 81% | 2828 fps | 97.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,036 psi | 85% | 2808 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 48,675 psi | 88% | 2867 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 47,137 psi | 86% | 2884 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 47,688 psi | 87% | 2841 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 39,204 psi | 71% | 2589 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 42,525 psi | 77% | 2690 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 31,299 psi | 57% | 2497 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 37,884 psi | 69% | 2644 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 29,675 psi | 54% | 2484 fps | 99.2% |
| Accurate 4350 | <<locked>> | 94% | 34,287 psi | 62% | 2654 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 36,129 psi | 66% | 2602 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 32,851 psi | 60% | 2507 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,203 psi | 69% | 2618 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 80% | 36,898 psi | 67% | 2618 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,077 psi | 80% | 2815 fps | 99.4% |
| Alliant Power Pro 2000-MR | 44.4 gr | 82% | 34,737 psi | 63% | 2664 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,428 psi | 53% | 2470 fps | 96.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,773 psi | 81% | 2690 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 32,068 psi | 58% | 2530 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 34,026 psi | 62% | 2621 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 84% | 29,312 psi | 53% | 2530 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,056 psi | 64% | 2598 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 28,485 psi | 52% | 2461 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,393 psi | 73% | 2615 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,868 psi | 65% | 2628 fps | 99% |
| Hodgdon CFE223 | <<locked>> | 80% | 39,813 psi | 72% | 2762 fps | 97.9% |
| Hodgdon H322 | <<locked>> | 80% | 43,743 psi | 79% | 2726 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,266 psi | 80% | 2746 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 36,695 psi | 67% | 2631 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 98% | 43,947 psi | 80% | 2828 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 36,332 psi | 66% | 2615 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 28,877 psi | 52% | 2461 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,372 psi | 59% | 2575 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,280 psi | 46% | 1539 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,230 psi | 64% | 2572 fps | 97.6% |
| IMR 3031 | <<locked>> | 80% | 35,041 psi | 64% | 2618 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,213 psi | 58% | 2487 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,136 psi | 82% | 2713 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 45,832 psi | 83% | 2657 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 33,692 psi | 61% | 2612 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 32,779 psi | 59% | 2562 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 80% | 38,203 psi | 69% | 2618 fps | 98.8% |
| Lovex D073.5 | <<locked>> | 80% | 42,496 psi | 77% | 2697 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 34,011 psi | 62% | 2575 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 37,144 psi | 67% | 2549 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 31,734 psi | 58% | 2493 fps | 97.5% |
| Lovex S065 | <<locked>> | 94% | 40,306 psi | 73% | 2674 fps | 95.7% |
| Lovex S070 | <<locked>> | 98% | 42,960 psi | 78% | 2746 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 35,201 psi | 64% | 2559 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 35,288 psi | 64% | 2572 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 31,473 psi | 57% | 2520 fps | 96% |
| Norma URP | <<locked>> | 92% | 33,446 psi | 61% | 2608 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 30,951 psi | 56% | 2520 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 98% | 40,234 psi | 73% | 2756 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 38,130 psi | 69% | 2612 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,072 psi | 67% | 2635 fps | 97.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,336 psi | 75% | 2661 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,498 psi | 46% | 1578 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,975 psi | 78% | 2707 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 42,830 psi | 78% | 2720 fps | 95.5% |
| ReloadSwiss RS 52 | 42 gr | 80% | 32,909 psi | 60% | 2618 fps | 95.8% |
| ReloadSwiss RS 60 | 42.7 gr | 80% | 27,470 psi | 50% | 2484 fps | 96.9% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 34,853 psi | 63% | 2674 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 38,711 psi | 70% | 2746 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 38,885 psi | 71% | 2612 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 33,402 psi | 61% | 2507 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 26,934 psi | 49% | 2408 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 94% | 40,306 psi | 73% | 2674 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,011 psi | 62% | 2575 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 31,734 psi | 58% | 2493 fps | 97.5% |
| Shooters World SW4350 | <<locked>> | 98% | 42,960 psi | 78% | 2746 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,324 psi | 82% | 2717 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 30,472 psi | 55% | 2516 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,658 psi | 83% | 2707 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 35,882 psi | 65% | 2579 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,679 psi | 63% | 2569 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,202 psi | 68% | 2526 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,327 psi | 55% | 2395 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 45,527 psi | 83% | 2723 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 40,785 psi | 74% | 2697 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 36,506 psi | 66% | 2530 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 35,636 psi | 65% | 2582 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 28,123 psi | 51% | 2421 fps | 95.2% |
| Somchem S365 | <<locked>> | 88% | 26,034 psi | 47% | 2441 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 42,322 psi | 77% | 2598 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,304 psi | 68% | 2526 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,358 psi | 59% | 2507 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,489 psi | 61% | 2513 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 26,745 psi | 49% | 2365 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 92% | 35,230 psi | 64% | 2612 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 37,884 psi | 69% | 2612 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 80% | 32,068 psi | 58% | 2500 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 92% | 34,229 psi | 62% | 2615 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 29,617 psi | 54% | 2438 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 36,811 psi | 67% | 2654 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 43,947 psi | 80% | 2828 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,736 psi | 61% | 2572 fps | 97.4% |
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 106 powders for 7.5 x 55 Swiss loaded with the .306 | 160gr | Peregrine VLR-4. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,969 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,969 fps. Accurate 4350 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.306" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for 7.5 x 55 Swiss with the .306 | 160gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-26, Hodgdon H4350, IMR 4350 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.