Load Specifications
Bullet:.308 | 180gr | Barnes TSX BT
Bullet Manufacturer:Barnes
Bullet Weight:180 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.30-06 R Stief load data
Case Length (l3):2.49"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:69 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:58,740 psi
Recommended Twist Rate:1:12.5
Load data in caliber .30-06 R Stief with .308 | 180gr | Barnes TSX BT bullet and 95 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>> | 84% | 51,561 psi | 88% | 2533 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 52,446 psi | 89% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 51,387 psi | 87% | 2608 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,011 psi | 90% | 2592 fps | 96.4% |
| Accurate 4064 | <<locked>> | 92% | 52,533 psi | 89% | 2635 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,112 psi | 89% | 2703 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 86% | 50,676 psi | 86% | 2618 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 92% | 51,735 psi | 88% | 2618 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 84% | 49,937 psi | 85% | 2579 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 50,183 psi | 85% | 2559 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 50,053 psi | 85% | 2723 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 51,387 psi | 87% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 51,938 psi | 88% | 2657 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,879 psi | 87% | 2713 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 51,735 psi | 88% | 2749 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,766 psi | 61% | 2454 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,755 psi | 68% | 2595 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 50,241 psi | 86% | 2628 fps | 99.2% |
| Bofors RP3 | <<locked>> | 92% | 51,634 psi | 88% | 2651 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 52,344 psi | 89% | 2621 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 51,895 psi | 88% | 2566 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,170 psi | 89% | 2651 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 50,488 psi | 86% | 2690 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 92% | 52,750 psi | 90% | 2664 fps | 99% |
| Hodgdon H414 | <<locked>> | 98% | 51,924 psi | 88% | 2703 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 86% | 51,184 psi | 87% | 2631 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,818 psi | 80% | 2595 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 50,256 psi | 86% | 2657 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 52,953 psi | 90% | 2736 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,012 psi | 60% | 1611 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 52,678 psi | 90% | 2635 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 50,821 psi | 87% | 2618 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 51,387 psi | 87% | 2605 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 51,576 psi | 88% | 2582 fps | 97% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,199 psi | 89% | 2641 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 51,039 psi | 87% | 2605 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,647 psi | 85% | 2651 fps | 99.1% |
| IMR 4895 | <<locked>> | 88% | 49,980 psi | 85% | 2638 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 84% | 49,937 psi | 85% | 2579 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 52,997 psi | 90% | 2608 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 49,966 psi | 85% | 2598 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 50,705 psi | 86% | 2556 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 50,937 psi | 87% | 2602 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 50,067 psi | 85% | 2598 fps | 98% |
| Lovex S070 | <<locked>> | 98% | 50,488 psi | 86% | 2621 fps | 97.1% |
| Norma 201 | <<locked>> | 88% | 52,779 psi | 90% | 2618 fps | 100% |
| Norma 202 | <<locked>> | 86% | 49,879 psi | 85% | 2575 fps | 100% |
| Norma 203B | <<locked>> | 90% | 51,111 psi | 87% | 2644 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 51,576 psi | 88% | 2697 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 51,692 psi | 88% | 2671 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,575 psi | 86% | 2690 fps | 97.8% |
| Ramshot TAC | <<locked>> | 84% | 50,009 psi | 85% | 2589 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,055 psi | 90% | 2661 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 50,633 psi | 86% | 2575 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 60% | 1650 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 52,779 psi | 90% | 2608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 49,922 psi | 85% | 2595 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,127 psi | 89% | 2720 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 51,779 psi | 88% | 2753 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,025 psi | 89% | 2730 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,243 psi | 89% | 2753 fps | 99% |
| Rottweil R 901 | <<locked>> | 84% | 50,401 psi | 86% | 2556 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,011 psi | 90% | 2615 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 51,503 psi | 88% | 2644 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 52,344 psi | 89% | 2621 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 50,067 psi | 85% | 2598 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 86% | 49,966 psi | 85% | 2598 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 50,937 psi | 87% | 2602 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 50,488 psi | 86% | 2621 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 50,009 psi | 85% | 2654 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 51,721 psi | 88% | 2618 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 52,475 psi | 89% | 2641 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 51,213 psi | 87% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 51,445 psi | 88% | 2523 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 50,140 psi | 85% | 2549 fps | 96.7% |
| Somchem S321 | <<locked>> | 82% | 50,618 psi | 86% | 2605 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 50,604 psi | 86% | 2520 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 51,271 psi | 87% | 2612 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 51,982 psi | 88% | 2641 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,992 psi | 78% | 2648 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 51,082 psi | 87% | 2487 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 51,459 psi | 88% | 2510 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 52,634 psi | 90% | 2582 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 50,531 psi | 86% | 2559 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 50,198 psi | 85% | 2582 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 50,807 psi | 86% | 2644 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 84% | 50,212 psi | 85% | 2575 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 51,938 psi | 88% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 49,864 psi | 85% | 2648 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,696 psi | 66% | 2526 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 51,677 psi | 88% | 2631 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 49,864 psi | 85% | 2621 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,243 psi | 89% | 2707 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,778 psi | 54% | 2428 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,330 psi | 89% | 2651 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 45,498 psi | 77% | 2448 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,463 psi | 64% | 2365 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,759 psi | 76% | 2510 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,458 psi | 84% | 2539 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 35,476 psi | 60% | 2356 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,069 psi | 58% | 2385 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 41,858 psi | 71% | 2470 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 35,592 psi | 61% | 2329 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,976 psi | 75% | 2484 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 43,947 psi | 75% | 2474 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,898 psi | 65% | 2490 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,940 psi | 59% | 2349 fps | 97.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,579 psi | 64% | 2408 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,867 psi | 59% | 2398 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,095 psi | 51% | 2310 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,733 psi | 51% | 2300 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,014 psi | 63% | 2530 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,089 psi | 70% | 2474 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 34,258 psi | 58% | 2349 fps | 97.9% |
| Bofors RP7 | <<locked>> | 92% | 46,064 psi | 78% | 2520 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,788 psi | 78% | 2474 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,496 psi | 72% | 2500 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,963 psi | 80% | 2631 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 80% | 35,375 psi | 60% | 2352 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 92% | 42,453 psi | 72% | 2543 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 42,206 psi | 72% | 2480 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,936 psi | 51% | 2254 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,218 psi | 65% | 2454 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 94% | 45,948 psi | 78% | 2621 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,020 psi | 44% | 1437 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,480 psi | 69% | 2434 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 41,626 psi | 71% | 2480 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,333 psi | 64% | 2362 fps | 97.2% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,484 psi | 77% | 2484 fps | 95.6% |
| IMR 4350 | <<locked>> | 96% | 45,948 psi | 78% | 2543 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,049 psi | 77% | 2507 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 33,199 psi | 57% | 2346 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 38,493 psi | 66% | 2434 fps | 98.1% |
| IMR 8208 XBR | <<locked>> | 80% | 43,976 psi | 75% | 2484 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 49,414 psi | 84% | 2559 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,422 psi | 69% | 2448 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,235 psi | 72% | 2415 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 37,043 psi | 63% | 2365 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 39,073 psi | 67% | 2405 fps | 95.4% |
| Lovex S070 | <<locked>> | 92% | 41,945 psi | 71% | 2477 fps | 95% |
| Norma 201 | <<locked>> | 80% | 40,756 psi | 69% | 2425 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 41,263 psi | 70% | 2438 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,970 psi | 63% | 2395 fps | 97.6% |
| Norma URP | <<locked>> | 88% | 34,824 psi | 59% | 2392 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 36,506 psi | 62% | 2408 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 41,553 psi | 71% | 2533 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 43,961 psi | 75% | 2487 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,163 psi | 73% | 2500 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,616 psi | 81% | 2526 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 45% | 1473 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,501 psi | 84% | 2562 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,075 psi | 70% | 2441 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,146 psi | 67% | 2500 fps | 97.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,111 psi | 55% | 2375 fps | 98.7% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 36,564 psi | 62% | 2457 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,217 psi | 63% | 2467 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 44,643 psi | 76% | 2467 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,783 psi | 66% | 2379 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 32,111 psi | 55% | 2293 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 92% | 46,064 psi | 78% | 2520 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,073 psi | 67% | 2405 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,422 psi | 69% | 2448 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,043 psi | 63% | 2365 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 92% | 41,945 psi | 71% | 2477 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,272 psi | 57% | 2339 fps | 96.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,858 psi | 71% | 2454 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,292 psi | 69% | 2438 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,496 psi | 72% | 2388 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,143 psi | 60% | 2264 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 43,830 psi | 75% | 2451 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 47,529 psi | 81% | 2559 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,887 psi | 71% | 2388 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,829 psi | 71% | 2457 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 33,127 psi | 56% | 2300 fps | 97% |
| Somchem S365 | <<locked>> | 84% | 27,079 psi | 46% | 2234 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 48,138 psi | 82% | 2448 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,830 psi | 73% | 2385 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,189 psi | 65% | 2369 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,928 psi | 66% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,488 psi | 54% | 2244 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 86% | 34,127 psi | 58% | 2343 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,019 psi | 75% | 2477 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 37,536 psi | 64% | 2369 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 35,853 psi | 61% | 2395 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 31,618 psi | 54% | 2369 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,965 psi | 51% | 2221 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 43,497 psi | 74% | 2520 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 42,685 psi | 73% | 2546 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,849 psi | 51% | 2369 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,711 psi | 68% | 2444 fps | 98.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 95 powders for .30-06 R Stief loaded with the .308 | 180gr | Barnes TSX BT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,753 fps; across all powders the maximum-charge window runs from 1,611 fps to 2,753 fps. Accurate 4350 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 (405 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.