Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 155gr | CutEdge MTAC 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% | 47,906 psi | 87% | 2789 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 49,139 psi | 89% | 2854 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 47,369 psi | 86% | 2841 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 47,137 psi | 86% | 2864 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 47,529 psi | 86% | 2887 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,033 psi | 78% | 2884 fps | 97.9% |
| ADI AR 2206H | <<locked>> | 88% | 47,021 psi | 85% | 2877 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 94% | 48,080 psi | 87% | 2871 fps | 99% |
| ADI Benchmark 8208 | <<locked>> | 88% | 49,617 psi | 90% | 2884 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 48,805 psi | 89% | 2861 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 47,282 psi | 86% | 2930 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 49,182 psi | 89% | 3031 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 46,847 psi | 85% | 2890 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 82% | 47,921 psi | 87% | 2795 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 47,761 psi | 87% | 2910 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,685 psi | 79% | 2897 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 98% | 47,282 psi | 86% | 3002 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 49,516 psi | 90% | 2936 fps | 98.9% |
| Bofors RP3 | <<locked>> | 96% | 49,835 psi | 90% | 2953 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 86% | 48,921 psi | 89% | 2825 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 47,863 psi | 87% | 2910 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 49,414 psi | 90% | 3002 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 82% | 46,876 psi | 85% | 2835 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 47,659 psi | 86% | 2861 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 48,341 psi | 88% | 2910 fps | 98.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 47,282 psi | 86% | 2943 fps | 96% |
| Hodgdon H4895 | <<locked>> | 88% | 47,369 psi | 86% | 2887 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,842 psi | 72% | 2779 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 48,776 psi | 89% | 2966 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,272 psi | 62% | 1768 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 48,863 psi | 89% | 2894 fps | 99.7% |
| IMR 3031 | <<locked>> | 90% | 49,603 psi | 90% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 47,543 psi | 86% | 2854 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,327 psi | 88% | 2828 fps | 95.9% |
| IMR 4198 | <<locked>> | 82% | 48,849 psi | 89% | 2759 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,278 psi | 75% | 2828 fps | 97.6% |
| IMR 4895 | <<locked>> | 92% | 48,921 psi | 89% | 2946 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 49,617 psi | 90% | 2884 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 49,037 psi | 89% | 2864 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 48,660 psi | 88% | 2900 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 47,630 psi | 86% | 2805 fps | 99.3% |
| Lovex S062 | <<locked>> | 94% | 49,806 psi | 90% | 2900 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,994 psi | 89% | 2887 fps | 97.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 46,108 psi | 84% | 2861 fps | 95.9% |
| Norma 201 | <<locked>> | 90% | 48,733 psi | 88% | 2871 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 49,211 psi | 89% | 2881 fps | 100% |
| Norma 203B | <<locked>> | 92% | 46,920 psi | 85% | 2900 fps | 99.3% |
| Norma URPᴾ | <<locked>> | 100% | 43,526 psi | 79% | 2884 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 92% | 46,905 psi | 85% | 2917 fps | 99.2% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 43,149 psi | 78% | 2871 fps | 95.8% |
| Ramshot TAC | <<locked>> | 86% | 46,905 psi | 85% | 2841 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 88% | 49,081 psi | 89% | 2917 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 47,703 psi | 87% | 2835 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,374 psi | 62% | 1808 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 49,414 psi | 90% | 2871 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 49,211 psi | 89% | 2890 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 47,079 psi | 85% | 2972 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 47,268 psi | 86% | 3012 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,192 psi | 78% | 2907 fps | 97.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 44,715 psi | 81% | 2930 fps | 97.1% |
| Rottweil R 901 | <<locked>> | 88% | 49,792 psi | 90% | 2858 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 49,226 psi | 89% | 2871 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 49,705 psi | 90% | 2940 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,994 psi | 89% | 2887 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 90% | 48,660 psi | 88% | 2900 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 49,806 psi | 90% | 2900 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 46,108 psi | 84% | 2861 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 48,878 psi | 89% | 2831 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 48,443 psi | 88% | 2953 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 48,849 psi | 89% | 2815 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 47,819 psi | 87% | 2864 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 48,617 psi | 88% | 2897 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 48,153 psi | 87% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 47,718 psi | 87% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 49,066 psi | 89% | 2835 fps | 96.2% |
| Somchem S321 | <<locked>> | 84% | 46,920 psi | 85% | 2861 fps | 99.9% |
| Somchem S335 | <<locked>> | 88% | 47,195 psi | 86% | 2772 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 47,340 psi | 86% | 2861 fps | 99.2% |
| Somchem S355 | <<locked>> | 96% | 47,471 psi | 86% | 2894 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,609 psi | 70% | 2831 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 84% | 48,080 psi | 87% | 2746 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 48,138 psi | 87% | 2762 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 48,196 psi | 87% | 2838 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 49,748 psi | 90% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 48,892 psi | 89% | 2874 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,093 psi | 84% | 2884 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 86% | 46,615 psi | 85% | 2828 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 92% | 47,732 psi | 87% | 2854 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,889 psi | 81% | 2887 fps | 97.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,543 psi | 86% | 2874 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 49,023 psi | 89% | 2930 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 47,282 psi | 86% | 2943 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 90% | 47,892 psi | 87% | 2904 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% | 39,566 psi | 72% | 2651 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 42,844 psi | 78% | 2753 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 31,575 psi | 57% | 2556 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,174 psi | 69% | 2703 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 29,907 psi | 54% | 2539 fps | 99.2% |
| Accurate 4350 | <<locked>> | 94% | 34,563 psi | 63% | 2710 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 36,332 psi | 66% | 2661 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 33,025 psi | 60% | 2562 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,406 psi | 70% | 2677 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 80% | 36,985 psi | 67% | 2674 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,324 psi | 80% | 2877 fps | 99.4% |
| Alliant Power Pro 2000-MR | 45.8 gr | 82% | 34,911 psi | 63% | 2723 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,689 psi | 54% | 2526 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,947 psi | 82% | 2749 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 32,256 psi | 59% | 2585 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 92% | 34,142 psi | 62% | 2677 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 86% | 31,633 psi | 57% | 2648 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,288 psi | 64% | 2654 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 28,689 psi | 52% | 2516 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,625 psi | 74% | 2677 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,172 psi | 66% | 2687 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 40,016 psi | 73% | 2822 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 80% | 43,685 psi | 79% | 2782 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,570 psi | 81% | 2808 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 36,898 psi | 67% | 2687 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 98% | 44,179 psi | 80% | 2887 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 36,550 psi | 66% | 2674 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 30,879 psi | 56% | 2566 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,692 psi | 59% | 2635 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,208 psi | 46% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,433 psi | 64% | 2628 fps | 97.5% |
| IMR 3031 | <<locked>> | 80% | 35,346 psi | 64% | 2677 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,489 psi | 59% | 2543 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,252 psi | 82% | 2772 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 46,108 psi | 84% | 2720 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 33,910 psi | 62% | 2667 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 32,982 psi | 60% | 2618 fps | 96.4% |
| IMR 8208 XBR | <<locked>> | 80% | 38,406 psi | 70% | 2677 fps | 98.8% |
| Lovex D073.5 | <<locked>> | 80% | 42,772 psi | 78% | 2759 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 34,389 psi | 62% | 2638 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 37,391 psi | 68% | 2608 fps | 97.5% |
| Lovex S062 | <<locked>> | 80% | 31,966 psi | 58% | 2549 fps | 97.4% |
| Lovex S065 | <<locked>> | 94% | 40,596 psi | 74% | 2733 fps | 95.6% |
| Lovex S070 | <<locked>> | 98% | 43,381 psi | 79% | 2808 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 35,476 psi | 64% | 2615 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 35,520 psi | 64% | 2631 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 31,662 psi | 57% | 2575 fps | 95.9% |
| Norma URP | <<locked>> | 94% | 35,868 psi | 65% | 2723 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 31,183 psi | 57% | 2579 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 98% | 40,408 psi | 73% | 2815 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 38,348 psi | 70% | 2671 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,318 psi | 68% | 2694 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,611 psi | 76% | 2723 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,396 psi | 46% | 1617 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,120 psi | 78% | 2766 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 43,091 psi | 78% | 2779 fps | 95.4% |
| ReloadSwiss RS 52 | 43.4 gr | 80% | 33,272 psi | 60% | 2680 fps | 95.8% |
| ReloadSwiss RS 60 | 44 gr | 80% | 27,514 psi | 50% | 2533 fps | 96.7% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 35,143 psi | 64% | 2733 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 39,073 psi | 71% | 2808 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 38,972 psi | 71% | 2667 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 33,707 psi | 61% | 2566 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 29,008 psi | 53% | 2516 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 40,596 psi | 74% | 2733 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,389 psi | 62% | 2638 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 31,966 psi | 58% | 2549 fps | 97.4% |
| Shooters World SW4350 | <<locked>> | 98% | 43,381 psi | 79% | 2808 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,614 psi | 83% | 2776 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 30,501 psi | 55% | 2566 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,788 psi | 83% | 2769 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 36,129 psi | 66% | 2635 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,998 psi | 64% | 2628 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,289 psi | 68% | 2582 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,429 psi | 55% | 2448 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 45,919 psi | 83% | 2782 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 41,046 psi | 74% | 2756 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 36,738 psi | 67% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 35,868 psi | 65% | 2638 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 28,369 psi | 51% | 2477 fps | 95.1% |
| Somchem S365 | <<locked>> | 88% | 26,194 psi | 48% | 2493 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 42,467 psi | 77% | 2657 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,420 psi | 68% | 2582 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,474 psi | 59% | 2559 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,489 psi | 61% | 2566 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 26,745 psi | 49% | 2411 fps | 96% |
| Vihtavuori N160 | <<locked>> | 92% | 35,491 psi | 64% | 2667 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 38,058 psi | 69% | 2667 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 32,213 psi | 58% | 2552 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 92% | 34,403 psi | 62% | 2671 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 29,791 psi | 54% | 2490 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 37,144 psi | 67% | 2713 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 44,179 psi | 80% | 2887 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,026 psi | 62% | 2628 fps | 97.3% |
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 93 powders for 7.5 x 55 Swiss loaded with the .308 | 155gr | CutEdge MTAC. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,768 fps to 3,031 fps. Accurate 4350 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 62–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Hodgdon H414 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 .308 | 155gr | CutEdge MTAC 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.