Load Specifications
Bullet Manufacturer:Hornady
Bullet Weight:180 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.30-06 Spring. load data
Case Length (l3):2.494"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:68.2 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:58,740 psi
Recommended Twist Rate:1:11.0
Load data in caliber .30-06 Spring. with .308 | 180gr | Hornady InterBond 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% | 50,749 psi | 86% | 2500 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 52,388 psi | 89% | 2566 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 51,924 psi | 88% | 2562 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 50,560 psi | 86% | 2575 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 51,924 psi | 88% | 2549 fps | 95.8% |
| Accurate 4064 | <<locked>> | 92% | 52,040 psi | 89% | 2605 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,734 psi | 86% | 2661 fps | 99% |
| ADI AR 2206H | <<locked>> | 88% | 53,084 psi | 90% | 2631 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 50,865 psi | 87% | 2582 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 52,199 psi | 89% | 2585 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 52,272 psi | 89% | 2566 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 52,431 psi | 89% | 2736 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 50,285 psi | 86% | 2602 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 90% | 51,111 psi | 87% | 2621 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,806 psi | 85% | 2671 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 96% | 50,459 psi | 86% | 2707 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,259 psi | 60% | 2418 fps | 97.1% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 52,547 psi | 89% | 2641 fps | 99.2% |
| Bofors RP3 | <<locked>> | 92% | 50,415 psi | 86% | 2615 fps | 99.9% |
| Bofors RP7 | <<locked>> | 96% | 51,285 psi | 87% | 2579 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 84% | 51,097 psi | 87% | 2530 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 51,111 psi | 87% | 2615 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 52,895 psi | 90% | 2703 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 52,939 psi | 90% | 2585 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 51,880 psi | 88% | 2625 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 98% | 50,604 psi | 86% | 2661 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 86% | 50,198 psi | 85% | 2592 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,745 psi | 78% | 2556 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 52,489 psi | 89% | 2671 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 51,576 psi | 88% | 2687 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,983 psi | 60% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 51,401 psi | 88% | 2595 fps | 99.8% |
| IMR 3031 | <<locked>> | 88% | 53,040 psi | 90% | 2625 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 50,444 psi | 86% | 2569 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 88% | 50,517 psi | 86% | 2539 fps | 96.4% |
| IMR 4350ᴾ | <<locked>> | 100% | 51,227 psi | 87% | 2602 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,127 psi | 90% | 2612 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,312 psi | 82% | 2608 fps | 98.7% |
| IMR 4895 | <<locked>> | 90% | 52,388 psi | 89% | 2651 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 52,199 psi | 89% | 2585 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 52,286 psi | 89% | 2575 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 52,257 psi | 89% | 2608 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,011 psi | 90% | 2566 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 50,096 psi | 85% | 2566 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 52,330 psi | 89% | 2605 fps | 98.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,953 psi | 90% | 2635 fps | 97.2% |
| Norma 201 | <<locked>> | 88% | 51,938 psi | 88% | 2582 fps | 100% |
| Norma 202 | <<locked>> | 88% | 52,170 psi | 89% | 2585 fps | 100% |
| Norma 203B | <<locked>> | 90% | 50,357 psi | 86% | 2612 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 50,473 psi | 86% | 2657 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 90% | 50,415 psi | 86% | 2631 fps | 99.5% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,516 psi | 84% | 2648 fps | 97.3% |
| Ramshot TAC | <<locked>> | 86% | 52,591 psi | 90% | 2602 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 51,996 psi | 89% | 2621 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 82% | 49,806 psi | 85% | 2539 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,520 psi | 60% | 1631 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 51,909 psi | 88% | 2572 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 52,417 psi | 89% | 2608 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 50,763 psi | 86% | 2677 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 50,372 psi | 86% | 2710 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,546 psi | 86% | 2684 fps | 98.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,097 psi | 87% | 2707 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 84% | 50,140 psi | 85% | 2526 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 52,199 psi | 89% | 2579 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 50,299 psi | 86% | 2605 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 96% | 51,285 psi | 87% | 2579 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 98% | 52,330 psi | 89% | 2605 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 52,257 psi | 89% | 2608 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 50,096 psi | 85% | 2566 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,953 psi | 90% | 2635 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 52,069 psi | 89% | 2664 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 50,546 psi | 86% | 2575 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 51,416 psi | 88% | 2602 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 50,676 psi | 86% | 2490 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 50,473 psi | 86% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 52,634 psi | 90% | 2559 fps | 96.8% |
| Somchem S321 | <<locked>> | 82% | 49,821 psi | 85% | 2569 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 53,011 psi | 90% | 2530 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 50,270 psi | 86% | 2572 fps | 99.5% |
| Somchem S355 | <<locked>> | 94% | 51,068 psi | 87% | 2605 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,063 psi | 77% | 2612 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 82% | 50,618 psi | 86% | 2461 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 50,807 psi | 86% | 2480 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 51,808 psi | 88% | 2552 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 52,649 psi | 90% | 2566 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 52,417 psi | 89% | 2589 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,823 psi | 90% | 2651 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 52,576 psi | 90% | 2585 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 50,952 psi | 87% | 2562 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,996 psi | 89% | 2657 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,695 psi | 64% | 2487 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 50,241 psi | 86% | 2589 fps | 99.8% |
| Winchester 748 | <<locked>> | 86% | 52,243 psi | 89% | 2631 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 50,865 psi | 87% | 2664 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 51,010 psi | 87% | 2612 fps | 99.8% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 44,904 psi | 76% | 2418 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,066 psi | 84% | 2520 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,434 psi | 64% | 2343 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,193 psi | 75% | 2480 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,660 psi | 83% | 2500 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 35,418 psi | 60% | 2333 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 36,071 psi | 61% | 2408 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 41,394 psi | 70% | 2441 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 35,128 psi | 60% | 2297 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,424 psi | 74% | 2448 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 43,033 psi | 73% | 2441 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,217 psi | 63% | 2451 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,563 psi | 59% | 2320 fps | 97.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,231 psi | 63% | 2375 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,534 psi | 59% | 2369 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 82% | 31,662 psi | 54% | 2326 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,212 psi | 53% | 2316 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,321 psi | 69% | 2438 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 33,866 psi | 58% | 2316 fps | 97.5% |
| Bofors RP7 | <<locked>> | 94% | 48,037 psi | 82% | 2530 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,208 psi | 77% | 2438 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,727 psi | 71% | 2464 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,934 psi | 78% | 2592 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 49,458 psi | 84% | 2536 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 37,391 psi | 64% | 2372 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 94% | 44,585 psi | 76% | 2559 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 41,756 psi | 71% | 2451 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 31,546 psi | 54% | 2270 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,362 psi | 64% | 2415 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 96% | 48,254 psi | 82% | 2631 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,165 psi | 45% | 1421 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,972 psi | 68% | 2405 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 40,872 psi | 70% | 2448 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,854 psi | 63% | 2326 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 44,672 psi | 76% | 2444 fps | 95% |
| IMR 4350 | <<locked>> | 98% | 48,022 psi | 82% | 2552 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 47,050 psi | 80% | 2513 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 34,824 psi | 59% | 2362 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 38,058 psi | 65% | 2405 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 80% | 43,424 psi | 74% | 2448 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 48,646 psi | 83% | 2523 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,871 psi | 68% | 2418 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 41,698 psi | 71% | 2382 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 36,695 psi | 62% | 2336 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 40,901 psi | 70% | 2415 fps | 95.6% |
| Lovex S070 | <<locked>> | 94% | 43,787 psi | 75% | 2487 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 40,422 psi | 69% | 2395 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 40,741 psi | 69% | 2408 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,622 psi | 62% | 2365 fps | 97.3% |
| Norma URP | <<locked>> | 90% | 36,434 psi | 62% | 2405 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 35,839 psi | 61% | 2369 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 96% | 43,511 psi | 74% | 2543 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 43,265 psi | 74% | 2448 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,598 psi | 73% | 2467 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,760 psi | 80% | 2490 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,252 psi | 45% | 1453 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,631 psi | 83% | 2526 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 43,163 psi | 73% | 2457 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,392 psi | 65% | 2461 fps | 97.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,618 psi | 54% | 2336 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,839 psi | 61% | 2418 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,044 psi | 66% | 2480 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 44,295 psi | 75% | 2438 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,479 psi | 66% | 2349 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 31,908 psi | 54% | 2267 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 48,037 psi | 82% | 2530 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 40,901 psi | 70% | 2415 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,871 psi | 68% | 2418 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 36,695 psi | 62% | 2336 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 94% | 43,787 psi | 75% | 2487 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,851 psi | 56% | 2310 fps | 95.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,205 psi | 70% | 2418 fps | 96.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,711 psi | 68% | 2405 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,148 psi | 72% | 2359 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,838 psi | 59% | 2238 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 46,180 psi | 79% | 2464 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 46,673 psi | 79% | 2523 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 41,466 psi | 71% | 2359 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,075 psi | 70% | 2421 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 32,837 psi | 56% | 2274 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 26,934 psi | 46% | 2205 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 47,659 psi | 81% | 2418 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,366 psi | 72% | 2359 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,811 psi | 64% | 2343 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,450 psi | 65% | 2349 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,212 psi | 53% | 2218 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 35,940 psi | 61% | 2359 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 43,250 psi | 74% | 2444 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 37,028 psi | 63% | 2336 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 37,579 psi | 64% | 2411 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 96% | 33,127 psi | 56% | 2385 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,747 psi | 51% | 2192 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 42,453 psi | 72% | 2480 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 44,585 psi | 76% | 2559 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,189 psi | 67% | 2411 fps | 98.4% |
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 Spring. loaded with the .308 | 180gr | Hornady InterBond. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,736 fps; across all powders the maximum-charge window runs from 1,588 fps to 2,736 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 60–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:11.0 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.