Load Specifications
Bullet:.308 | 180gr | Barnes XLC S
Bullet Manufacturer:Barnes
Bullet Weight:180 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 RCM load data
Case Length (l3):2.09"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:75 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:12.0
Load data in caliber .300 RCM with .308 | 180gr | Barnes XLC S bullet and 96 powders. The key underlying parameters are shown in the table above.
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>> | 82% | 55,521 psi | 87% | 2602 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,535 psi | 87% | 2638 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,651 psi | 87% | 2687 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,246 psi | 88% | 2674 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,005 psi | 71% | 2598 fps | 97.2% |
| Accurate 4064 | <<locked>> | 88% | 55,259 psi | 87% | 2684 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,493 psi | 90% | 2808 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 57,551 psi | 90% | 2746 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,926 psi | 86% | 2700 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,188 psi | 88% | 2694 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,464 psi | 90% | 2667 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,913 psi | 89% | 2864 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,448 psi | 87% | 2723 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,666 psi | 87% | 2740 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,505 psi | 85% | 2805 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,666 psi | 87% | 2841 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,351 psi | 66% | 2621 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,355 psi | 74% | 2782 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,087 psi | 89% | 2762 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 56,434 psi | 88% | 2743 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,825 psi | 87% | 2710 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,476 psi | 85% | 2628 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,014 psi | 88% | 2730 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,710 psi | 89% | 2749 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 55,970 psi | 88% | 2799 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 94% | 56,478 psi | 89% | 2759 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 84% | 54,723 psi | 86% | 2707 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,317 psi | 85% | 2733 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,305 psi | 90% | 2789 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,376 psi | 88% | 2835 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 56% | 1647 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,477 psi | 87% | 2707 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,868 psi | 86% | 2690 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,418 psi | 85% | 2680 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,450 psi | 90% | 2707 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 55,651 psi | 87% | 2730 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,363 psi | 90% | 2736 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 2795 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 57,029 psi | 89% | 2769 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,188 psi | 88% | 2694 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,404 psi | 85% | 2680 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,521 psi | 89% | 2671 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,027 psi | 86% | 2684 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,290 psi | 90% | 2736 fps | 99.3% |
| Lovex S070 | <<locked>> | 96% | 54,998 psi | 86% | 2723 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 56,782 psi | 89% | 2697 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,014 psi | 89% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,955 psi | 86% | 2730 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,260 psi | 88% | 2779 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 47,007 psi | 74% | 2733 fps | 96.5% |
| Norma URP | <<locked>> | 98% | 55,869 psi | 88% | 2792 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 55,274 psi | 87% | 2753 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,607 psi | 86% | 2789 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 56,318 psi | 88% | 2717 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,304 psi | 88% | 2736 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,116 psi | 90% | 2700 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,709 psi | 58% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,811 psi | 89% | 2730 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,101 psi | 88% | 2805 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,434 psi | 87% | 2838 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,898 psi | 89% | 2831 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,767 psi | 87% | 2848 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,027 psi | 86% | 2635 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,246 psi | 90% | 2694 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,217 psi | 88% | 2733 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,825 psi | 87% | 2710 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,290 psi | 90% | 2736 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,404 psi | 85% | 2680 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,027 psi | 86% | 2684 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,998 psi | 86% | 2723 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,072 psi | 89% | 2785 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,434 psi | 87% | 2703 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,724 psi | 87% | 2717 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,725 psi | 90% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,549 psi | 85% | 2589 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,421 psi | 90% | 2687 fps | 98.3% |
| Somchem S335 | <<locked>> | 86% | 57,232 psi | 90% | 2628 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,578 psi | 86% | 2687 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,260 psi | 88% | 2730 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,099 psi | 85% | 2795 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,459 psi | 79% | 2687 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 82% | 57,406 psi | 90% | 2589 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 54,592 psi | 86% | 2572 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,000 psi | 89% | 2657 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,290 psi | 90% | 2671 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 57,334 psi | 90% | 2703 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,998 psi | 86% | 2736 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 56,985 psi | 89% | 2697 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,651 psi | 87% | 2674 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,638 psi | 90% | 2795 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,891 psi | 73% | 2697 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,723 psi | 86% | 2713 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,826 psi | 89% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,202 psi | 88% | 2802 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,377 psi | 60% | 2644 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,724 psi | 87% | 2726 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 52,475 psi | 82% | 2559 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,427 psi | 73% | 2513 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,257 psi | 82% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,630 psi | 73% | 2520 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 37,246 psi | 58% | 2451 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 43,830 psi | 69% | 2510 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,576 psi | 51% | 2356 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 48,153 psi | 75% | 2602 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,988 psi | 64% | 2461 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,995 psi | 78% | 2602 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,952 psi | 80% | 2585 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,758 psi | 69% | 2641 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,075 psi | 64% | 2487 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,961 psi | 69% | 2549 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,300 psi | 51% | 2356 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,795 psi | 56% | 2474 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,645 psi | 45% | 2283 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,243 psi | 54% | 2490 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,123 psi | 74% | 2608 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 41,365 psi | 65% | 2503 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 44,324 psi | 69% | 2516 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,517 psi | 81% | 2585 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,298 psi | 77% | 2631 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,742 psi | 65% | 2500 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 41,162 psi | 65% | 2543 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 47,239 psi | 74% | 2608 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 48,617 psi | 76% | 2612 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,008 psi | 47% | 2267 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,643 psi | 70% | 2592 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 43,221 psi | 68% | 2605 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 42% | 1470 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,238 psi | 72% | 2562 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 48,399 psi | 76% | 2598 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,989 psi | 67% | 2493 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,469 psi | 71% | 2513 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 43,990 psi | 69% | 2536 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,801 psi | 67% | 2490 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 33,504 psi | 53% | 2365 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,005 psi | 71% | 2575 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 49,995 psi | 78% | 2602 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,964 psi | 75% | 2585 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,587 psi | 75% | 2533 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 43,410 psi | 68% | 2500 fps | 99.8% |
| Lovex S065 | <<locked>> | 80% | 36,245 psi | 57% | 2359 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 40,944 psi | 64% | 2480 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 47,703 psi | 75% | 2562 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,558 psi | 75% | 2559 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,352 psi | 68% | 2539 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 49,545 psi | 78% | 2674 fps | 95.1% |
| Norma MRP | <<locked>> | 98% | 44,135 psi | 69% | 2677 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 32,489 psi | 51% | 2349 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 42,670 psi | 67% | 2549 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 40,205 psi | 63% | 2533 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 49,763 psi | 78% | 2615 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,617 psi | 78% | 2635 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,534 psi | 84% | 2648 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 43% | 1506 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,974 psi | 66% | 2484 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,209 psi | 72% | 2648 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,884 psi | 59% | 2533 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,924 psi | 53% | 2411 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 35,897 psi | 56% | 2464 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 52,083 psi | 82% | 2595 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,440 psi | 71% | 2513 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,131 psi | 61% | 2451 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 44,324 psi | 69% | 2516 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,245 psi | 57% | 2359 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,964 psi | 75% | 2585 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,410 psi | 68% | 2500 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 40,944 psi | 64% | 2480 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,320 psi | 62% | 2490 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,776 psi | 76% | 2598 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,456 psi | 73% | 2572 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,457 psi | 76% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,741 psi | 64% | 2382 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,395 psi | 66% | 2448 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 48,283 psi | 76% | 2507 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,979 psi | 75% | 2589 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 39,624 psi | 62% | 2451 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 29,399 psi | 46% | 2310 fps | 97.5% |
| Somchem S385 | <<locked>> | 96% | 44,730 psi | 70% | 2589 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 54,230 psi | 85% | 2549 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,660 psi | 76% | 2490 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,005 psi | 71% | 2490 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,165 psi | 71% | 2497 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,681 psi | 59% | 2388 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 33,707 psi | 53% | 2349 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 50,198 psi | 79% | 2602 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,656 psi | 68% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,315 psi | 52% | 2352 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 30,777 psi | 48% | 2359 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,228 psi | 52% | 2320 fps | 97.5% |
| Winchester 748 | <<locked>> | 80% | 50,111 psi | 79% | 2648 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,162 psi | 65% | 2543 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,660 psi | 45% | 2356 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,050 psi | 72% | 2579 fps | 99.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 96 powders for .300 RCM loaded with the .308 | 180gr | Barnes XLC S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,647 fps to 2,864 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.