Load Specifications
Load data in caliber .243 Win. with .243 | 89gr | Merlin Virtus 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-16, ReloadSwiss RS 70 and Hodgdon Superformance.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 53,345 psi | 89% | 2933 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 52,649 psi | 87% | 2930 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,020 psi | 75% | 2877 fps | 97.1% |
| Accurate 4064 | <<locked>> | 88% | 53,737 psi | 89% | 2986 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,447 psi | 90% | 3071 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 54,099 psi | 90% | 3022 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 51,924 psi | 86% | 2969 fps | 99.7% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,663 psi | 87% | 3041 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 82% | 52,924 psi | 88% | 2969 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,925 psi | 90% | 2946 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,940 psi | 90% | 3136 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 51,996 psi | 86% | 2989 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 52,156 psi | 87% | 3005 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 96% | 52,141 psi | 87% | 3077 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,200 psi | 88% | 3107 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,909 psi | 86% | 3031 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,511 psi | 71% | 2907 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,530 psi | 81% | 3087 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,027 psi | 90% | 3028 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 52,605 psi | 87% | 3002 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 52,750 psi | 88% | 2972 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,273 psi | 90% | 2953 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,228 psi | 87% | 2989 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,388 psi | 89% | 3015 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 94% | 53,635 psi | 89% | 3068 fps | 98% |
| Hodgdon H4350 | <<locked>> | 92% | 54,099 psi | 90% | 3031 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 82% | 51,198 psi | 85% | 2979 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 52,156 psi | 87% | 3002 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 50,749 psi | 84% | 3005 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 50,488 psi | 84% | 3035 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,404 psi | 59% | 1919 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 52,185 psi | 87% | 2979 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 50,952 psi | 85% | 2963 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 51,140 psi | 85% | 2949 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,288 psi | 90% | 2979 fps | 97.9% |
| IMR 4350 | <<locked>> | 96% | 53,461 psi | 89% | 2999 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,433 psi | 90% | 3005 fps | 97.9% |
| IMR 4831 | <<locked>> | 96% | 51,401 psi | 85% | 3005 fps | 99.5% |
| IMR 4895 | <<locked>> | 86% | 53,534 psi | 89% | 3041 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 52,924 psi | 88% | 2969 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,853 psi | 89% | 2992 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,142 psi | 88% | 2943 fps | 99.9% |
| Lovex S062 | <<locked>> | 86% | 51,082 psi | 85% | 2946 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,027 psi | 90% | 2995 fps | 98.9% |
| Lovex S070 | <<locked>> | 94% | 51,895 psi | 86% | 2982 fps | 97.8% |
| Norma 201 | <<locked>> | 84% | 52,315 psi | 87% | 2959 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,055 psi | 88% | 2963 fps | 100% |
| Norma 203B | <<locked>> | 86% | 51,430 psi | 85% | 2992 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 54,085 psi | 90% | 3045 fps | 96.2% |
| Norma MRPᴾ | <<locked>> | 100% | 48,022 psi | 80% | 3041 fps | 96.8% |
| Norma URP | <<locked>> | 96% | 53,345 psi | 89% | 3058 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 52,156 psi | 87% | 3015 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 52,518 psi | 87% | 3051 fps | 98.5% |
| Ramshot TAC | <<locked>> | 82% | 53,026 psi | 88% | 2979 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,026 psi | 88% | 3002 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,897 psi | 60% | 1965 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,592 psi | 89% | 2995 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 52,953 psi | 88% | 3077 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,910 psi | 88% | 3110 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,360 psi | 90% | 3091 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,896 psi | 90% | 3120 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 52,997 psi | 88% | 2943 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,200 psi | 88% | 2966 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 52,460 psi | 87% | 2995 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,415 psi | 84% | 3009 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 92% | 52,750 psi | 88% | 2972 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,027 psi | 90% | 2995 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,853 psi | 89% | 2992 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 51,082 psi | 85% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 51,895 psi | 86% | 2982 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,317 psi | 90% | 3054 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 51,416 psi | 85% | 2953 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 52,591 psi | 87% | 2989 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,751 psi | 89% | 2904 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,389 psi | 90% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,201 psi | 90% | 2946 fps | 97.9% |
| Somchem S335 | <<locked>> | 84% | 53,200 psi | 88% | 2897 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 51,126 psi | 85% | 2946 fps | 99.8% |
| Somchem S355 | <<locked>> | 90% | 52,910 psi | 88% | 2995 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 52,098 psi | 87% | 3061 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,503 psi | 86% | 2992 fps | 97% |
| Vihtavuori N133 | <<locked>> | 84% | 54,186 psi | 90% | 2887 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,185 psi | 88% | 2930 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,780 psi | 89% | 2940 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,404 psi | 90% | 2972 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 52,286 psi | 87% | 2999 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 82% | 53,359 psi | 89% | 2969 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 52,272 psi | 87% | 2936 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 51,416 psi | 85% | 2999 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,224 psi | 78% | 2989 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 52,620 psi | 87% | 2972 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,592 psi | 89% | 3015 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,635 psi | 89% | 3068 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,159 psi | 63% | 2920 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 84% | 52,533 psi | 87% | 2995 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 43,497 psi | 72% | 2785 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,788 psi | 76% | 2812 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 38,885 psi | 65% | 2756 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 41,176 psi | 68% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,375 psi | 59% | 2710 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 47,413 psi | 79% | 2910 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 40,059 psi | 67% | 2746 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 98% | 49,545 psi | 82% | 2986 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,574 psi | 82% | 2917 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,212 psi | 83% | 2897 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,569 psi | 72% | 2946 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,972 psi | 66% | 2772 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,975 psi | 71% | 2841 fps | 98.6% |
| Alliant Reloder-16 | 36.5 gr | 84% | 35,259 psi | 59% | 2726 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,635 psi | 58% | 2736 fps | 97.6% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,544 psi | 81% | 2972 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,734 psi | 51% | 2618 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,998 psi | 60% | 2812 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,036 psi | 78% | 2910 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 39,842 psi | 66% | 2776 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 46,180 psi | 77% | 2858 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,894 psi | 85% | 2900 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,834 psi | 81% | 2936 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,350 psi | 67% | 2776 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 43,729 psi | 73% | 2887 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 47,384 psi | 79% | 2913 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 47,863 psi | 80% | 2923 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,284 psi | 50% | 2559 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,266 psi | 74% | 2890 fps | 99.7% |
| Hodgdon Superformance | 43.5 gr | 88% | 43,439 psi | 72% | 2900 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,281 psi | 44% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,992 psi | 76% | 2871 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 47,819 psi | 79% | 2913 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,076 psi | 70% | 2785 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,628 psi | 74% | 2805 fps | 95.7% |
| IMR 4350 | <<locked>> | 90% | 43,859 psi | 73% | 2828 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,150 psi | 75% | 2841 fps | 95.8% |
| IMR 4831 | <<locked>> | 84% | 34,098 psi | 57% | 2661 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 44,063 psi | 73% | 2874 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 49,574 psi | 82% | 2917 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,963 psi | 78% | 2884 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,992 psi | 78% | 2841 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 42,032 psi | 70% | 2785 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 39,117 psi | 65% | 2720 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 42,525 psi | 71% | 2808 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 46,122 psi | 77% | 2858 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 46,717 psi | 78% | 2864 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,351 psi | 70% | 2828 fps | 98.9% |
| Norma 204 | <<locked>> | 94% | 50,502 psi | 84% | 2986 fps | 95.4% |
| Norma MRP | <<locked>> | 98% | 44,817 psi | 74% | 2976 fps | 95.9% |
| Norma URP | <<locked>> | 84% | 35,404 psi | 59% | 2707 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 42,308 psi | 70% | 2841 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 39,784 psi | 66% | 2808 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 49,734 psi | 83% | 2923 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,327 psi | 82% | 2943 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 45% | 1765 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,901 psi | 68% | 2759 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,629 psi | 76% | 2949 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,927 psi | 61% | 2808 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,041 psi | 58% | 2720 fps | 95.4% |
| ReloadSwiss RS 70 | 40.8 gr | 86% | 37,521 psi | 62% | 2789 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 49,951 psi | 83% | 2897 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,845 psi | 73% | 2805 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,275 psi | 62% | 2713 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 98% | 47,355 psi | 79% | 2953 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 88% | 46,180 psi | 77% | 2858 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,117 psi | 65% | 2720 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,963 psi | 78% | 2884 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,032 psi | 70% | 2785 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 42,525 psi | 71% | 2808 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,435 psi | 64% | 2766 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,080 psi | 80% | 2897 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,788 psi | 76% | 2871 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,268 psi | 79% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,465 psi | 66% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,208 psi | 73% | 2776 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 47,065 psi | 78% | 2805 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,848 psi | 79% | 2890 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 38,014 psi | 63% | 2723 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 27,659 psi | 46% | 2536 fps | 96.1% |
| Somchem S385 | <<locked>> | 96% | 44,889 psi | 75% | 2874 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 47,718 psi | 79% | 2795 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,453 psi | 72% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,280 psi | 74% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,274 psi | 60% | 2654 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 34,737 psi | 58% | 2657 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 49,850 psi | 83% | 2913 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,554 psi | 71% | 2776 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,258 psi | 57% | 2657 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 33,228 psi | 55% | 2694 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,227 psi | 54% | 2572 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 49,705 psi | 83% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,729 psi | 73% | 2887 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,109 psi | 48% | 2641 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,614 psi | 76% | 2877 fps | 99.6% |
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 .243 Win. loaded with the .243 | 89gr | Merlin Virtus. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,136 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 (415 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 89.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, 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-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .243 Win. with the .243 | 89gr | Merlin Virtus 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.