Load Specifications
Load data in caliber 6 mm XC with .243 | 102gr | Peregrine Glider GRM bullet and 99 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, Hodgdon Superformance 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.
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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>> | 84% | 55,056 psi | 86% | 2812 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,029 psi | 89% | 2890 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,188 psi | 90% | 2884 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,680 psi | 87% | 2907 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,637 psi | 89% | 2894 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,973 psi | 64% | 2726 fps | 95.9% |
| Accurate 4064 | <<locked>> | 92% | 57,261 psi | 90% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,867 psi | 84% | 2976 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 54,534 psi | 85% | 2923 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,550 psi | 87% | 2923 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,072 psi | 89% | 2923 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,375 psi | 85% | 2844 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,331 psi | 85% | 3048 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,637 psi | 87% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,202 psi | 88% | 2969 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,042 psi | 86% | 3035 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,420 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,189 psi | 61% | 2756 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,063 psi | 69% | 2927 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,375 psi | 85% | 2940 fps | 99.7% |
| Bofors RP3 | <<locked>> | 92% | 56,159 psi | 88% | 2959 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,347 psi | 88% | 2933 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,288 psi | 87% | 2854 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,362 psi | 88% | 2953 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,665 psi | 86% | 2999 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 92% | 57,290 psi | 90% | 2979 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 98% | 56,927 psi | 89% | 3031 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 96% | 57,595 psi | 90% | 2992 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 86% | 55,071 psi | 86% | 2933 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,532 psi | 81% | 2907 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,346 psi | 85% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,621 psi | 84% | 3005 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 55% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,492 psi | 89% | 2936 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,926 psi | 86% | 2910 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,926 psi | 86% | 2904 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,897 psi | 86% | 2884 fps | 97.9% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 2956 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,679 psi | 86% | 2910 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,346 psi | 85% | 2966 fps | 99.7% |
| IMR 4895 | <<locked>> | 90% | 57,653 psi | 90% | 2999 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 57,072 psi | 89% | 2923 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,203 psi | 90% | 2907 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,624 psi | 90% | 2943 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,334 psi | 90% | 2897 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,694 psi | 86% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,290 psi | 90% | 2953 fps | 99.2% |
| Lovex S070 | <<locked>> | 98% | 54,708 psi | 86% | 2933 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 56,405 psi | 88% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,188 psi | 90% | 2913 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,376 psi | 87% | 2953 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,638 psi | 90% | 3015 fps | 96.7% |
| Norma URPᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3015 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 55,956 psi | 88% | 2979 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,521 psi | 87% | 3018 fps | 98.8% |
| Ramshot TAC | <<locked>> | 86% | 57,508 psi | 90% | 2949 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,884 psi | 89% | 2963 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,317 psi | 85% | 2871 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,897 psi | 56% | 1821 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,246 psi | 88% | 2897 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,740 psi | 90% | 2963 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,710 psi | 89% | 3035 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,304 psi | 88% | 3074 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3058 fps | 99.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,261 psi | 90% | 3094 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 86% | 57,377 psi | 90% | 2894 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,014 psi | 89% | 2913 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,028 psi | 88% | 2953 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,347 psi | 88% | 2933 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,290 psi | 90% | 2953 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,624 psi | 90% | 2943 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,694 psi | 86% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,708 psi | 86% | 2933 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,389 psi | 85% | 2963 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,811 psi | 87% | 2923 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,333 psi | 88% | 2943 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,636 psi | 86% | 2802 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,100 psi | 86% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,476 psi | 85% | 2858 fps | 97.8% |
| Somchem S321 | <<locked>> | 82% | 54,679 psi | 86% | 2904 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,334 psi | 90% | 2844 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,405 psi | 87% | 2913 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,420 psi | 88% | 2949 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,633 psi | 79% | 2959 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,375 psi | 85% | 2762 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,940 psi | 86% | 2785 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,739 psi | 89% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,288 psi | 85% | 2844 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,404 psi | 85% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,680 psi | 87% | 2963 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 54,128 psi | 85% | 2874 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,101 psi | 88% | 2894 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,375 psi | 85% | 2963 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,047 psi | 67% | 2835 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,738 psi | 87% | 2936 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,740 psi | 90% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,927 psi | 89% | 3031 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,056 psi | 55% | 2756 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,463 psi | 88% | 2953 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% | 48,689 psi | 76% | 2720 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,476 psi | 84% | 2841 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,973 psi | 64% | 2638 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,385 psi | 76% | 2799 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,412 psi | 73% | 2723 fps | 95.3% |
| Accurate 3100 | <<locked>> | 98% | 38,116 psi | 60% | 2664 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 38,769 psi | 61% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,735 psi | 51% | 2556 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 44,991 psi | 71% | 2756 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,334 psi | 60% | 2605 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,108 psi | 74% | 2766 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 47,732 psi | 75% | 2749 fps | 100% |
| Alliant Power Pro 2000-MR | 34 gr | 80% | 41,046 psi | 64% | 2792 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,869 psi | 59% | 2625 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,625 psi | 64% | 2687 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,243 psi | 52% | 2575 fps | 95.2% |
| Alliant Reloder-17 | 33.5 gr | 80% | 32,706 psi | 51% | 2589 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,472 psi | 48% | 2526 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,404 psi | 55% | 2720 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,222 psi | 69% | 2759 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 37,188 psi | 58% | 2621 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 46,441 psi | 73% | 2762 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,791 psi | 76% | 2753 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,035 psi | 72% | 2789 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,184 psi | 80% | 2943 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 38,261 psi | 60% | 2628 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 43,381 psi | 68% | 2792 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 90% | 47,543 psi | 75% | 2822 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,397 psi | 71% | 2769 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,413 psi | 45% | 2411 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,394 psi | 65% | 2736 fps | 99.4% |
| Hodgdon Superformance | 40.7 gr | 92% | 46,615 psi | 73% | 2877 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,165 psi | 41% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,642 psi | 68% | 2720 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 45,121 psi | 71% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,248 psi | 63% | 2641 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,612 psi | 67% | 2657 fps | 95.1% |
| IMR 4350 | <<locked>> | 94% | 46,905 psi | 74% | 2795 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,815 psi | 67% | 2690 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 34,185 psi | 54% | 2575 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,640 psi | 65% | 2720 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 47,108 psi | 74% | 2766 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 53,229 psi | 83% | 2851 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,179 psi | 69% | 2736 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,904 psi | 70% | 2690 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 39,827 psi | 62% | 2638 fps | 99.3% |
| Lovex S065 | <<locked>> | 84% | 37,217 psi | 58% | 2579 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 42,627 psi | 67% | 2717 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 43,859 psi | 69% | 2703 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 44,411 psi | 70% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,001 psi | 63% | 2677 fps | 98.5% |
| Norma 204 | <<locked>> | 96% | 50,009 psi | 78% | 2890 fps | 95% |
| Norma URP | <<locked>> | 84% | 33,170 psi | 52% | 2562 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,726 psi | 62% | 2690 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 39,508 psi | 62% | 2717 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 47,050 psi | 74% | 2772 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,659 psi | 73% | 2792 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,662 psi | 79% | 2812 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,789 psi | 42% | 1631 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,794 psi | 83% | 2844 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,336 psi | 65% | 2671 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,830 psi | 67% | 2795 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,853 psi | 55% | 2661 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,896 psi | 55% | 2635 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,739 psi | 59% | 2710 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 47,703 psi | 75% | 2746 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,568 psi | 65% | 2651 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,911 psi | 55% | 2562 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 46,441 psi | 73% | 2762 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,217 psi | 58% | 2579 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,179 psi | 69% | 2736 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,827 psi | 62% | 2638 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 42,627 psi | 67% | 2717 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,129 psi | 57% | 2618 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,165 psi | 71% | 2743 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,395 psi | 68% | 2723 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,498 psi | 71% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,840 psi | 59% | 2523 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,785 psi | 65% | 2635 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 50,923 psi | 80% | 2844 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,889 psi | 70% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,991 psi | 71% | 2743 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 35,940 psi | 56% | 2572 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 25,889 psi | 41% | 2388 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 51,401 psi | 81% | 2720 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,905 psi | 72% | 2654 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,495 psi | 65% | 2641 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,829 psi | 66% | 2644 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,069 psi | 53% | 2507 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 34,809 psi | 55% | 2569 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,036 psi | 74% | 2759 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,422 psi | 63% | 2638 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,113 psi | 53% | 2566 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 92% | 32,909 psi | 52% | 2608 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,226 psi | 47% | 2428 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 47,050 psi | 74% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,729 psi | 69% | 2799 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,674 psi | 45% | 2546 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,888 psi | 67% | 2726 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 99 powders for 6 mm XC loaded with the .243 | 102gr | Peregrine Glider GRM. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,094 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 102.0 gr projectile in 0.243" calls for a 1:6.5 twist; slower twists will usually not stabilise this weight. 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 Power Pro 2000-MR, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 6 mm XC with the .243 | 102gr | Peregrine Glider GRM 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.