Load Specifications
Load data in caliber 6 mm GT with .245 | 92gr | Peregrine VLR-4 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 52 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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 55,361 psi | 89% | 2887 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,767 psi | 90% | 2986 fps | 98.8% |
| Accurate 2460 | <<locked>> | 86% | 53,925 psi | 87% | 2910 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 55,521 psi | 90% | 2936 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,535 psi | 90% | 2972 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,274 psi | 89% | 2979 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,382 psi | 72% | 2867 fps | 96.5% |
| Accurate LT-30 | <<locked>> | 84% | 55,201 psi | 89% | 2831 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,622 psi | 90% | 2858 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,143 psi | 87% | 2969 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 98% | 55,187 psi | 89% | 2963 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 84% | 56,028 psi | 90% | 2956 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,548 psi | 86% | 2927 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 90% | 53,229 psi | 86% | 2913 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,969 psi | 89% | 3035 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,940 psi | 87% | 3081 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,534 psi | 88% | 2986 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,013 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,680 psi | 90% | 3012 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,483 psi | 72% | 2874 fps | 96.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,779 psi | 84% | 3041 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,665 psi | 88% | 2831 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,230 psi | 87% | 2982 fps | 98.5% |
| Bofors RP3 | <<locked>> | 98% | 54,650 psi | 88% | 2995 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 52,866 psi | 85% | 2871 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 90% | 52,402 psi | 85% | 2956 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,157 psi | 87% | 3051 fps | 99% |
| Hodgdon H322 | <<locked>> | 86% | 54,476 psi | 88% | 2936 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,666 psi | 90% | 2959 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,011 psi | 86% | 2956 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 92% | 54,636 psi | 88% | 2982 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,625 psi | 66% | 2756 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,432 psi | 86% | 3009 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,127 psi | 55% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 52,823 psi | 85% | 2933 fps | 99.4% |
| IMR 3031 | <<locked>> | 92% | 54,172 psi | 87% | 2979 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,042 psi | 89% | 2953 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,956 psi | 90% | 2927 fps | 95.9% |
| IMR 4198 | <<locked>> | 86% | 55,680 psi | 90% | 2858 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,337 psi | 68% | 2805 fps | 96.1% |
| IMR 4895 | <<locked>> | 94% | 53,490 psi | 86% | 2992 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 90% | 53,548 psi | 86% | 2927 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 86% | 53,447 psi | 86% | 2913 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,055 psi | 86% | 2946 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,897 psi | 89% | 2907 fps | 99.3% |
| Lovex S062 | <<locked>> | 96% | 53,882 psi | 87% | 2943 fps | 99.8% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,937 psi | 81% | 2871 fps | 96.2% |
| Norma 200 | <<locked>> | 82% | 54,766 psi | 88% | 2864 fps | 100% |
| Norma 201 | <<locked>> | 92% | 52,692 psi | 85% | 2913 fps | 99.7% |
| Norma 202 | <<locked>> | 92% | 53,301 psi | 86% | 2927 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,708 psi | 88% | 2999 fps | 99.3% |
| Norma URPᴾ | <<locked>> | 100% | 44,672 psi | 72% | 2864 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 96% | 55,390 psi | 89% | 3025 fps | 99.3% |
| Ramshot TAC | <<locked>> | 90% | 54,389 psi | 88% | 2936 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,388 psi | 86% | 2959 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,114 psi | 89% | 2930 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,621 psi | 56% | 1831 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,388 psi | 86% | 2917 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,708 psi | 87% | 2933 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,303 psi | 89% | 3074 fps | 99.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,390 psi | 89% | 3114 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,164 psi | 71% | 2881 fps | 96.1% |
| Rottweil R 901 | <<locked>> | 90% | 53,954 psi | 87% | 2907 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,447 psi | 86% | 2913 fps | 99.7% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,491 psi | 88% | 2986 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,937 psi | 81% | 2871 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,055 psi | 86% | 2946 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,882 psi | 87% | 2943 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,621 psi | 86% | 2887 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,898 psi | 90% | 2585 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 52,620 psi | 85% | 2913 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 53,185 psi | 86% | 2999 fps | 99.1% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 52,721 psi | 85% | 2867 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 56,028 psi | 90% | 2969 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 52,852 psi | 85% | 2940 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,434 psi | 89% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,042 psi | 89% | 2864 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,071 psi | 89% | 2966 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 54,027 psi | 87% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,492 psi | 90% | 2963 fps | 99.3% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,114 psi | 89% | 2986 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,711 psi | 64% | 2808 fps | 98.5% |
| Vihtavuori N130 | <<locked>> | 88% | 55,361 psi | 89% | 2844 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,347 psi | 89% | 2858 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,695 psi | 90% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,983 psi | 87% | 2904 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,490 psi | 86% | 2920 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,340 psi | 76% | 2871 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 90% | 54,404 psi | 88% | 2933 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 96% | 55,753 psi | 90% | 2949 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,992 psi | 74% | 2867 fps | 96.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,385 psi | 78% | 2858 fps | 98.9% |
| Winchester 748 | <<locked>> | 90% | 53,359 psi | 86% | 2976 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,898 psi | 90% | 3002 fps | 99.7% |
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% | 40,161 psi | 65% | 2644 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,185 psi | 84% | 2927 fps | 98.3% |
| Accurate 2460 | <<locked>> | 80% | 43,497 psi | 70% | 2740 fps | 99.8% |
| Accurate 2495 | <<locked>> | 80% | 32,169 psi | 52% | 2533 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 39,059 psi | 63% | 2690 fps | 99.1% |
| Accurate 4064 | <<locked>> | 80% | 30,458 psi | 49% | 2507 fps | 97.9% |
| Accurate 4350 | <<locked>> | 98% | 41,321 psi | 67% | 2808 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 49,037 psi | 79% | 2740 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,414 psi | 80% | 2762 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,869 psi | 59% | 2635 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 86% | 38,276 psi | 62% | 2648 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 48,646 psi | 78% | 2848 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,914 psi | 63% | 2657 fps | 97.6% |
| Alliant AR-Comp | <<locked>> | 80% | 37,782 psi | 61% | 2671 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,962 psi | 73% | 2858 fps | 98.4% |
| Alliant Power Pro 2000-MR | 32.2 gr | 86% | 40,886 psi | 66% | 2822 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 32,503 psi | 52% | 2552 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,527 psi | 73% | 2749 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 37,405 psi | 60% | 2667 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 98% | 42,119 psi | 68% | 2822 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 90% | 36,796 psi | 59% | 2733 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,051 psi | 78% | 2733 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 41,307 psi | 67% | 2749 fps | 95.8% |
| Bofors RP3 | <<locked>> | 84% | 33,953 psi | 55% | 2605 fps | 95.9% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,162 psi | 66% | 2661 fps | 98.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,101 psi | 60% | 2671 fps | 97.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 40,930 psi | 66% | 2802 fps | 96.3% |
| Hodgdon H322 | <<locked>> | 80% | 44,599 psi | 72% | 2779 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,484 psi | 73% | 2802 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 43,047 psi | 69% | 2776 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 37,101 psi | 60% | 2648 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 35,940 psi | 58% | 2651 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,286 psi | 54% | 2605 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,454 psi | 41% | 1598 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,810 psi | 58% | 2602 fps | 95.9% |
| IMR 3031 | <<locked>> | 80% | 36,085 psi | 58% | 2664 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 37,637 psi | 61% | 2628 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 52,562 psi | 85% | 2874 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 46,514 psi | 75% | 2720 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 39,566 psi | 64% | 2749 fps | 95.2% |
| IMR 4895 | <<locked>> | 82% | 35,853 psi | 58% | 2644 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 38,914 psi | 63% | 2657 fps | 97.6% |
| Lovex D073.5 | <<locked>> | 80% | 43,555 psi | 70% | 2746 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 80% | 35,099 psi | 57% | 2615 fps | 98.2% |
| Lovex S060 | <<locked>> | 80% | 37,971 psi | 61% | 2592 fps | 96% |
| Lovex S062 | <<locked>> | 80% | 32,576 psi | 53% | 2523 fps | 95.7% |
| Lovex S065 | <<locked>> | 98% | 46,804 psi | 75% | 2815 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 51,372 psi | 83% | 2815 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,013 psi | 58% | 2592 fps | 96.9% |
| Norma 202 | <<locked>> | 80% | 36,289 psi | 59% | 2615 fps | 99% |
| Norma 203B | <<locked>> | 84% | 36,738 psi | 59% | 2657 fps | 95.7% |
| Norma URP | <<locked>> | 98% | 41,843 psi | 67% | 2808 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 84% | 36,637 psi | 59% | 2671 fps | 95.3% |
| Ramshot TAC | <<locked>> | 84% | 44,411 psi | 72% | 2762 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,116 psi | 61% | 2674 fps | 96% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,279 psi | 68% | 2703 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,657 psi | 41% | 1637 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,005 psi | 71% | 2756 fps | 99.5% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 50,401 psi | 81% | 2877 fps | 95.5% |
| ReloadSwiss RS 52 | 30.5 gr | 84% | 38,928 psi | 63% | 2772 fps | 95.7% |
| ReloadSwiss RS 60 | 30.2 gr | 82% | 29,950 psi | 48% | 2552 fps | 95.4% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 41,336 psi | 67% | 2825 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 39,523 psi | 64% | 2651 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 34,185 psi | 55% | 2543 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 86% | 33,866 psi | 55% | 2595 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 98% | 46,804 psi | 75% | 2815 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,099 psi | 57% | 2615 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 32,576 psi | 53% | 2523 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,673 psi | 75% | 2772 fps | 98.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,939 psi | 85% | 2549 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,400 psi | 80% | 2861 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 35,534 psi | 57% | 2651 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,557 psi | 75% | 2772 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 42,322 psi | 68% | 2730 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,418 psi | 57% | 2598 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,913 psi | 61% | 2572 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,995 psi | 50% | 2428 fps | 98.6% |
| Somchem S321 | <<locked>> | 80% | 41,930 psi | 68% | 2740 fps | 98.6% |
| Somchem S335 | <<locked>> | 80% | 37,260 psi | 60% | 2572 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 36,651 psi | 59% | 2618 fps | 95.5% |
| Somchem S355 | <<locked>> | 86% | 35,244 psi | 57% | 2608 fps | 95.7% |
| Somchem S365 | <<locked>> | 92% | 30,560 psi | 49% | 2572 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 43,149 psi | 70% | 2657 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,058 psi | 61% | 2579 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,141 psi | 53% | 2546 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 34,113 psi | 55% | 2546 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 82% | 29,225 psi | 47% | 2438 fps | 95% |
| Vihtavuori N160 | <<locked>> | 96% | 41,452 psi | 67% | 2759 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 38,725 psi | 62% | 2648 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 80% | 32,735 psi | 53% | 2526 fps | 98% |
| Vihtavuori N550 | <<locked>> | 98% | 43,076 psi | 69% | 2812 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 34,766 psi | 56% | 2575 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 37,623 psi | 61% | 2687 fps | 98.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,766 psi | 56% | 2605 fps | 95.7% |
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 GT loaded with the .245 | 92gr | Peregrine VLR-4. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,114 fps. Accurate 4350 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 (427 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 92.0 gr projectile in 0.245" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 52, ReloadSwiss RS 60 rank at the top here: for 6 mm GT with the .245 | 92gr | Peregrine VLR-4 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.