Load Specifications
Load data in caliber .338 Blaser Mag. with .338 | 200gr | Hornady SST InterLock bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, Hodgdon Superformance and ReloadSwiss RS 60.
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 2015 | <<locked>> | 84% | 54,752 psi | 90% | 2769 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,229 psi | 87% | 2792 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 51,401 psi | 84% | 2808 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 52,576 psi | 86% | 2789 fps | 96.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,480 psi | 66% | 2684 fps | 95.9% |
| Accurate 4064 | <<locked>> | 90% | 53,359 psi | 88% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,939 psi | 87% | 2923 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 53,853 psi | 88% | 2874 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,737 psi | 90% | 2871 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 52,866 psi | 87% | 2822 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,621 psi | 88% | 2799 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,272 psi | 87% | 2989 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,737 psi | 90% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 52,083 psi | 86% | 2867 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,201 psi | 89% | 2979 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 51,851 psi | 85% | 2963 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,740 psi | 64% | 2713 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,279 psi | 71% | 2874 fps | 98.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,490 psi | 88% | 2887 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 51,938 psi | 85% | 2861 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 52,112 psi | 86% | 2825 fps | 96.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,723 psi | 90% | 2808 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,185 psi | 86% | 2854 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,925 psi | 89% | 2949 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 52,866 psi | 87% | 2871 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 96% | 52,185 psi | 86% | 2917 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 94% | 53,214 psi | 87% | 2884 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 86% | 54,433 psi | 89% | 2884 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,415 psi | 83% | 2851 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,737 psi | 88% | 2917 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 52,808 psi | 87% | 2949 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,549 psi | 58% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 52,272 psi | 86% | 2835 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,215 psi | 89% | 2864 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,360 psi | 89% | 2854 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,389 psi | 89% | 2835 fps | 97.8% |
| IMR 4350 | <<locked>> | 98% | 52,359 psi | 86% | 2851 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,128 psi | 89% | 2861 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,548 psi | 88% | 2913 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 53,417 psi | 88% | 2897 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 52,866 psi | 87% | 2822 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,432 psi | 88% | 2848 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,606 psi | 88% | 2802 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 54,041 psi | 89% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,287 psi | 87% | 2851 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 54,259 psi | 89% | 2887 fps | 98.1% |
| Norma 201 | <<locked>> | 86% | 52,678 psi | 86% | 2818 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,011 psi | 87% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,462 psi | 89% | 2900 fps | 100% |
| Norma URP | <<locked>> | 98% | 52,112 psi | 86% | 2910 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 51,503 psi | 85% | 2874 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,447 psi | 89% | 2963 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 53,156 psi | 87% | 2841 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 52,721 psi | 87% | 2861 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,635 psi | 88% | 2825 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 59% | 1795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,127 psi | 87% | 2851 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,257 psi | 86% | 2930 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 51,750 psi | 85% | 2966 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 52,431 psi | 86% | 2943 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 52,315 psi | 86% | 2969 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 84% | 53,737 psi | 88% | 2802 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,113 psi | 87% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 51,779 psi | 85% | 2851 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 52,112 psi | 86% | 2825 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,287 psi | 87% | 2851 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,432 psi | 88% | 2848 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,041 psi | 89% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,259 psi | 89% | 2887 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,534 psi | 88% | 2913 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,027 psi | 90% | 2871 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 52,359 psi | 86% | 2844 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,143 psi | 89% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,259 psi | 89% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,519 psi | 88% | 2802 fps | 97.7% |
| Somchem S321 | <<locked>> | 82% | 53,853 psi | 88% | 2854 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,548 psi | 88% | 2756 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,549 psi | 90% | 2861 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 52,112 psi | 86% | 2848 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,009 psi | 82% | 2917 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,911 psi | 89% | 2720 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,375 psi | 89% | 2743 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 52,765 psi | 87% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,708 psi | 88% | 2799 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,664 psi | 88% | 2828 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,665 psi | 90% | 2907 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 53,316 psi | 88% | 2822 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 51,851 psi | 85% | 2795 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,490 psi | 88% | 2910 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,351 psi | 70% | 2789 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,998 psi | 90% | 2884 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,098 psi | 87% | 2871 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 52,402 psi | 86% | 2920 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,737 psi | 57% | 2713 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 86% | 51,909 psi | 85% | 2851 fps | 100% |
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 2015 | <<locked>> | 80% | 48,486 psi | 80% | 2680 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,176 psi | 68% | 2608 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,182 psi | 79% | 2759 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,137 psi | 76% | 2680 fps | 95.2% |
| Accurate 3100 | <<locked>> | 98% | 37,753 psi | 62% | 2628 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 38,957 psi | 64% | 2602 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,561 psi | 53% | 2526 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 44,483 psi | 73% | 2713 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 37,927 psi | 62% | 2562 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,572 psi | 76% | 2720 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 46,963 psi | 77% | 2707 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,495 psi | 66% | 2746 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,594 psi | 62% | 2589 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,234 psi | 66% | 2648 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,127 psi | 54% | 2543 fps | 95.3% |
| Alliant Reloder-17 | 62.1 gr | 80% | 32,329 psi | 53% | 2552 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,284 psi | 50% | 2493 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,027 psi | 57% | 2677 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,671 psi | 72% | 2717 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 37,202 psi | 61% | 2592 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 46,064 psi | 76% | 2720 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,298 psi | 79% | 2710 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,469 psi | 75% | 2746 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,256 psi | 83% | 2890 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 80% | 37,956 psi | 62% | 2592 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 42,902 psi | 70% | 2749 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 49,922 psi | 82% | 2825 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 44,918 psi | 74% | 2726 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,398 psi | 47% | 2382 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,002 psi | 67% | 2697 fps | 99.4% |
| Hodgdon Superformance | 75.5 gr | 92% | 45,774 psi | 75% | 2825 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,469 psi | 43% | 1568 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,062 psi | 71% | 2674 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 44,585 psi | 73% | 2717 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,827 psi | 65% | 2598 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,264 psi | 69% | 2618 fps | 95.1% |
| IMR 4350 | <<locked>> | 94% | 46,151 psi | 76% | 2743 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,279 psi | 69% | 2648 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 33,866 psi | 56% | 2539 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,220 psi | 68% | 2680 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 46,572 psi | 76% | 2720 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 43,656 psi | 72% | 2694 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,541 psi | 73% | 2651 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 39,697 psi | 65% | 2602 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 37,043 psi | 61% | 2546 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 42,221 psi | 69% | 2674 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,801 psi | 72% | 2667 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 44,019 psi | 72% | 2677 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,610 psi | 65% | 2638 fps | 98.5% |
| Norma URP | <<locked>> | 84% | 33,011 psi | 54% | 2530 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 39,204 psi | 64% | 2651 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 39,218 psi | 64% | 2677 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 46,572 psi | 76% | 2730 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,050 psi | 76% | 2749 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,270 psi | 83% | 2769 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 44% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,089 psi | 67% | 2631 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,438 psi | 70% | 2756 fps | 98.6% |
| ReloadSwiss RS 60 | 62.1 gr | 80% | 34,418 psi | 56% | 2618 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,635 psi | 57% | 2598 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,275 psi | 61% | 2664 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 47,688 psi | 78% | 2707 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,568 psi | 68% | 2618 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,983 psi | 57% | 2536 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 46,064 psi | 76% | 2720 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,043 psi | 61% | 2546 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,656 psi | 72% | 2694 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,697 psi | 65% | 2602 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 42,221 psi | 69% | 2674 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,940 psi | 59% | 2585 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,976 psi | 74% | 2707 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,120 psi | 71% | 2684 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,005 psi | 74% | 2618 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,449 psi | 61% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,164 psi | 73% | 2644 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 50,372 psi | 83% | 2799 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,744 psi | 73% | 2621 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,512 psi | 73% | 2697 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 35,926 psi | 59% | 2543 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 25,976 psi | 43% | 2369 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 50,763 psi | 83% | 2674 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,324 psi | 74% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,002 psi | 67% | 2598 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,640 psi | 68% | 2608 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,040 psi | 56% | 2477 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 34,505 psi | 57% | 2530 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 46,804 psi | 77% | 2720 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,074 psi | 66% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,011 psi | 56% | 2536 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 30,501 psi | 50% | 2516 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,168 psi | 50% | 2398 fps | 96.1% |
| Winchester 748 | <<locked>> | 80% | 46,412 psi | 76% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,033 psi | 71% | 2753 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,689 psi | 47% | 2516 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,612 psi | 70% | 2690 fps | 99.4% |
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 95 powders for .338 Blaser Mag. loaded with the .338 | 200gr | Hornady SST InterLock. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,755 fps to 2,989 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. Accurate 3100, 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. Alliant Reloder-17, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .338 Blaser Mag. with the .338 | 200gr | Hornady SST InterLock 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.