Load Specifications
Load data in caliber 6 mm Rem. with .243 | 89gr | Merlin Virtus 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 Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
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 2015 | <<locked>> | 84% | 54,607 psi | 88% | 3015 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,243 psi | 85% | 3035 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,448 psi | 89% | 3110 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 52,852 psi | 85% | 3025 fps | 96% |
| Accurate 4064 | <<locked>> | 90% | 53,519 psi | 86% | 3087 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,766 psi | 86% | 3166 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 86% | 53,954 psi | 87% | 3117 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 55,317 psi | 89% | 3120 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,301 psi | 85% | 3071 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,085 psi | 87% | 3051 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,099 psi | 87% | 3245 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,143 psi | 88% | 3140 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,753 psi | 89% | 3166 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,100 psi | 88% | 3232 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,620 psi | 84% | 3209 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,175 psi | 63% | 2927 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,164 psi | 71% | 3104 fps | 97.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,969 psi | 87% | 3130 fps | 99.3% |
| Bofors RP3 | <<locked>> | 92% | 55,695 psi | 89% | 3156 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,101 psi | 90% | 3123 fps | 96.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,868 psi | 88% | 3054 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,101 psi | 90% | 3153 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,679 psi | 88% | 3205 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 90% | 53,316 psi | 85% | 3114 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 96% | 53,156 psi | 85% | 3163 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 54,476 psi | 87% | 3130 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,242 psi | 82% | 3094 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,447 psi | 87% | 3169 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,911 psi | 86% | 3199 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,244 psi | 57% | 1942 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,072 psi | 90% | 3136 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,781 psi | 88% | 3120 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,940 psi | 88% | 3104 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,694 psi | 88% | 3077 fps | 97.2% |
| IMR 4350 | <<locked>> | 98% | 52,924 psi | 85% | 3091 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,636 psi | 88% | 3104 fps | 97.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,476 psi | 87% | 3159 fps | 99.3% |
| IMR 4895 | <<locked>> | 88% | 53,563 psi | 86% | 3140 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 84% | 53,301 psi | 85% | 3071 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,766 psi | 86% | 3094 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,722 psi | 86% | 3045 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 54,288 psi | 87% | 3094 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,983 psi | 87% | 3097 fps | 98.3% |
| Lovex S070 | <<locked>> | 98% | 54,853 psi | 88% | 3130 fps | 97.5% |
| Norma 201 | <<locked>> | 88% | 56,231 psi | 90% | 3117 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,287 psi | 85% | 3064 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,926 psi | 88% | 3150 fps | 99.8% |
| Norma URP | <<locked>> | 98% | 52,866 psi | 85% | 3153 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 90% | 55,840 psi | 90% | 3179 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,463 psi | 89% | 3209 fps | 98.3% |
| Ramshot TAC | <<locked>> | 84% | 53,577 psi | 86% | 3084 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,055 psi | 85% | 3100 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,940 psi | 86% | 3068 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,694 psi | 57% | 1988 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,086 psi | 90% | 3104 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,606 psi | 86% | 3091 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,721 psi | 85% | 3176 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,144 psi | 90% | 3274 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,374 psi | 86% | 3182 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,330 psi | 86% | 3219 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 84% | 53,432 psi | 86% | 3045 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,113 psi | 85% | 3058 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,535 psi | 89% | 3146 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,101 psi | 90% | 3123 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,983 psi | 87% | 3097 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,766 psi | 86% | 3094 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,288 psi | 87% | 3094 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,853 psi | 88% | 3130 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,998 psi | 87% | 3156 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,434 psi | 89% | 3117 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,246 psi | 90% | 3143 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,433 psi | 87% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,766 psi | 88% | 3002 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,317 psi | 87% | 3045 fps | 97.1% |
| Somchem S321 | <<locked>> | 82% | 54,157 psi | 87% | 3097 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,621 psi | 86% | 2999 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,013 psi | 88% | 3107 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 56,086 psi | 90% | 3146 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,749 psi | 81% | 3156 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,983 psi | 87% | 2966 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,752 psi | 88% | 2992 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 52,939 psi | 85% | 3028 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,969 psi | 87% | 3045 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,911 psi | 86% | 3068 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,608 psi | 89% | 3156 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 53,708 psi | 86% | 3071 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,782 psi | 89% | 3091 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,433 psi | 87% | 3156 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,975 psi | 69% | 3012 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,217 psi | 90% | 3136 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,577 psi | 86% | 3120 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,156 psi | 85% | 3163 fps | 97% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,027 psi | 56% | 2913 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,014 psi | 90% | 3150 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 2015 | <<locked>> | 80% | 48,414 psi | 78% | 2920 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,437 psi | 65% | 2818 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,080 psi | 77% | 2992 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 49,530 psi | 79% | 2966 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 38,276 psi | 61% | 2805 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 37,304 psi | 60% | 2841 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 44,599 psi | 72% | 2943 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 38,000 psi | 61% | 2776 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,760 psi | 75% | 2956 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 46,876 psi | 75% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | 37.7 gr | 80% | 40,640 psi | 65% | 2966 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,362 psi | 60% | 2795 fps | 97.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,234 psi | 65% | 2867 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 37,434 psi | 60% | 2861 fps | 95.8% |
| Alliant Reloder-17 | 37.1 gr | 80% | 32,227 psi | 52% | 2743 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,300 psi | 52% | 2743 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,130 psi | 61% | 2953 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,034 psi | 71% | 2943 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 36,999 psi | 59% | 2795 fps | 97.9% |
| Bofors RP7 | <<locked>> | 92% | 49,487 psi | 79% | 3005 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,588 psi | 78% | 2949 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,629 psi | 73% | 2972 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,705 psi | 81% | 3136 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 38,000 psi | 61% | 2802 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 92% | 46,383 psi | 74% | 3035 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 45,005 psi | 72% | 2956 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,140 psi | 52% | 2684 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,220 psi | 66% | 2920 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 94% | 49,966 psi | 80% | 3123 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,092 psi | 42% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,294 psi | 69% | 2904 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 44,686 psi | 72% | 2953 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,856 psi | 64% | 2815 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 48,066 psi | 77% | 2956 fps | 95.7% |
| IMR 4350 | <<locked>> | 96% | 49,545 psi | 79% | 3028 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,037 psi | 77% | 2982 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 36,260 psi | 58% | 2799 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 41,249 psi | 66% | 2900 fps | 98.1% |
| IMR 8208 XBR | <<locked>> | 80% | 46,760 psi | 75% | 2956 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 43,772 psi | 70% | 2920 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 44,512 psi | 71% | 2874 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 39,421 psi | 63% | 2812 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 41,843 psi | 67% | 2861 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 45,281 psi | 73% | 2949 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 43,395 psi | 70% | 2887 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 43,859 psi | 70% | 2900 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,624 psi | 64% | 2851 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 37,710 psi | 60% | 2848 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,320 psi | 63% | 2864 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 92% | 42,177 psi | 68% | 2949 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 46,833 psi | 75% | 2959 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,224 psi | 74% | 2979 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,604 psi | 81% | 3012 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,585 psi | 43% | 1781 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,518 psi | 84% | 3048 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,106 psi | 71% | 2910 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,380 psi | 68% | 2976 fps | 97.8% |
| ReloadSwiss RS 60 | 37.1 gr | 80% | 34,360 psi | 55% | 2822 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,333 psi | 60% | 2861 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,176 psi | 64% | 2936 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 47,166 psi | 76% | 2940 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,234 psi | 66% | 2835 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 34,650 psi | 56% | 2733 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 92% | 49,487 psi | 79% | 3005 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,843 psi | 67% | 2861 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,772 psi | 70% | 2920 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 39,421 psi | 63% | 2812 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 92% | 45,281 psi | 73% | 2949 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,766 psi | 57% | 2785 fps | 96.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,005 psi | 72% | 2927 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,004 psi | 69% | 2904 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,063 psi | 72% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,434 psi | 60% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 47,442 psi | 76% | 2923 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 50,720 psi | 81% | 3041 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,425 psi | 71% | 2844 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,831 psi | 72% | 2927 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 35,534 psi | 57% | 2740 fps | 97% |
| Somchem S365 | <<locked>> | 84% | 29,457 psi | 47% | 2664 fps | 96% |
| Vihtavuori N130 | <<locked>> | 80% | 50,908 psi | 82% | 2920 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,440 psi | 73% | 2844 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,944 psi | 66% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,568 psi | 67% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,837 psi | 54% | 2674 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 86% | 36,782 psi | 59% | 2789 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 46,905 psi | 75% | 2953 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 40,190 psi | 64% | 2818 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 38,943 psi | 62% | 2854 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 94% | 34,954 psi | 56% | 2825 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 32,140 psi | 52% | 2644 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 46,485 psi | 75% | 2995 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 46,383 psi | 74% | 3035 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,735 psi | 52% | 2835 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,627 psi | 68% | 2910 fps | 98.8% |
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 94 powders for 6 mm Rem. loaded with the .243 | 89gr | Merlin Virtus. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,274 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,274 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, 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. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for 6 mm Rem. 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.