Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:180 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Case Length (l3):2.003"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:13.5
Load data in caliber .300 Rem. SA Ultra Mag. with .308 | 180gr | Sierra SPT Pro-Hunter bullet and 103 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% | 57,261 psi | 88% | 2657 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,376 psi | 87% | 2687 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 58,088 psi | 89% | 2753 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 58,726 psi | 90% | 2746 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,207 psi | 66% | 2602 fps | 97.1% |
| Accurate 4064 | <<locked>> | 90% | 56,130 psi | 86% | 2733 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,304 psi | 87% | 2825 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 56,333 psi | 87% | 2766 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,305 psi | 88% | 2766 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,039 psi | 79% | 2749 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 86% | 58,755 psi | 90% | 2762 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,289 psi | 87% | 2684 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,217 psi | 86% | 2887 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 50,618 psi | 78% | 2746 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,421 psi | 88% | 2785 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 58,030 psi | 89% | 2808 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,159 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 58,784 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,864 psi | 77% | 2736 fps | 95.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,147 psi | 63% | 2631 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,006 psi | 71% | 2792 fps | 99.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,304 psi | 87% | 2785 fps | 99.9% |
| Bofors RP3 | <<locked>> | 92% | 58,291 psi | 90% | 2802 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 58,189 psi | 90% | 2779 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,782 psi | 87% | 2694 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 58,494 psi | 90% | 2795 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,942 psi | 88% | 2844 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,492 psi | 85% | 2769 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 96% | 55,317 psi | 85% | 2822 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 94% | 55,912 psi | 86% | 2785 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 86% | 56,927 psi | 88% | 2772 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,447 psi | 82% | 2753 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,594 psi | 87% | 2808 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,840 psi | 86% | 2861 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 55% | 1667 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,986 psi | 89% | 2772 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,305 psi | 88% | 2753 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,753 psi | 87% | 2746 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,565 psi | 87% | 2730 fps | 98.5% |
| IMR 4350ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 2808 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,579 psi | 87% | 2759 fps | 98.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,623 psi | 87% | 2815 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 55,912 psi | 86% | 2785 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 58,755 psi | 90% | 2762 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,376 psi | 87% | 2743 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,695 psi | 86% | 2694 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,869 psi | 87% | 2746 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,014 psi | 86% | 2753 fps | 99.3% |
| Lovex S070 | <<locked>> | 98% | 56,898 psi | 88% | 2789 fps | 98.8% |
| Norma 201 | <<locked>> | 88% | 58,682 psi | 90% | 2759 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,753 psi | 86% | 2710 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,217 psi | 88% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,637 psi | 86% | 2802 fps | 96.9% |
| Norma MRPᴾ | <<locked>> | 100% | 45,890 psi | 71% | 2749 fps | 96.7% |
| Norma URPᴾ | <<locked>> | 100% | 58,639 psi | 90% | 2861 fps | 100% |
| Ramshot Big Game | <<locked>> | 90% | 58,175 psi | 89% | 2825 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,638 psi | 89% | 2864 fps | 99.4% |
| Ramshot TAC | <<locked>> | 84% | 55,535 psi | 85% | 2740 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,245 psi | 85% | 2756 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,912 psi | 86% | 2717 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,318 psi | 56% | 1709 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 58,305 psi | 90% | 2740 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,709 psi | 86% | 2749 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,085 psi | 85% | 2825 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 58,349 psi | 90% | 2907 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,811 psi | 86% | 2844 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,085 psi | 85% | 2874 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 56,202 psi | 86% | 2690 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,593 psi | 86% | 2710 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 58,146 psi | 89% | 2792 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,457 psi | 75% | 2717 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 96% | 58,189 psi | 90% | 2779 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,014 psi | 86% | 2753 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,376 psi | 87% | 2743 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,869 psi | 87% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,898 psi | 88% | 2789 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,434 psi | 87% | 2808 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,812 psi | 89% | 2769 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 58,450 psi | 90% | 2789 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,536 psi | 87% | 2648 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,739 psi | 87% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,318 psi | 87% | 2707 fps | 98.5% |
| Somchem S321 | <<locked>> | 82% | 56,623 psi | 87% | 2746 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,956 psi | 86% | 2644 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,450 psi | 88% | 2759 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 58,276 psi | 90% | 2789 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,287 psi | 82% | 2812 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,211 psi | 76% | 2700 fps | 96.9% |
| Vihtavuori N130 | <<locked>> | 82% | 56,159 psi | 86% | 2608 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,811 psi | 87% | 2631 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,419 psi | 85% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,043 psi | 86% | 2687 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,202 psi | 86% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,725 psi | 89% | 2808 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 55,883 psi | 86% | 2717 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,827 psi | 89% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,681 psi | 87% | 2815 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,324 psi | 70% | 2703 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,899 psi | 89% | 2785 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,970 psi | 86% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,317 psi | 85% | 2822 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,883 psi | 57% | 2648 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 58,378 psi | 90% | 2795 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 50,705 psi | 78% | 2572 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,366 psi | 67% | 2503 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,575 psi | 78% | 2654 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,368 psi | 70% | 2536 fps | 95.6% |
| Accurate 3100 | <<locked>> | 96% | 37,724 psi | 58% | 2497 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 41,017 psi | 63% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,460 psi | 50% | 2392 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 46,760 psi | 72% | 2615 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 39,813 psi | 61% | 2474 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 47,601 psi | 73% | 2690 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,805 psi | 75% | 2618 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,530 psi | 76% | 2598 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,569 psi | 65% | 2654 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 47,514 psi | 73% | 2694 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,537 psi | 61% | 2493 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,453 psi | 65% | 2556 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,677 psi | 50% | 2405 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,243 psi | 53% | 2474 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 46,833 psi | 72% | 2684 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,427 psi | 44% | 2320 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,722 psi | 53% | 2543 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,079 psi | 71% | 2625 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 39,320 psi | 60% | 2500 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 42,772 psi | 66% | 2526 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,299 psi | 77% | 2602 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,761 psi | 73% | 2641 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,866 psi | 81% | 2785 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 39,958 psi | 61% | 2503 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 39,784 psi | 61% | 2549 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 46,122 psi | 71% | 2625 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 47,224 psi | 73% | 2628 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,210 psi | 43% | 2257 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,178 psi | 66% | 2602 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 41,959 psi | 65% | 2615 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 41% | 1490 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,150 psi | 69% | 2575 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 47,224 psi | 73% | 2615 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,800 psi | 64% | 2503 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,237 psi | 68% | 2526 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 42,786 psi | 66% | 2549 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,669 psi | 64% | 2503 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 31,560 psi | 49% | 2356 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 43,453 psi | 67% | 2585 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 48,805 psi | 75% | 2618 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,238 psi | 71% | 2595 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,601 psi | 72% | 2552 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 41,814 psi | 64% | 2507 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 36,492 psi | 56% | 2405 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 39,189 psi | 60% | 2480 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 45,701 psi | 70% | 2566 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,180 psi | 71% | 2572 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,800 psi | 64% | 2546 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 48,617 psi | 75% | 2694 fps | 95.3% |
| Norma MRP | <<locked>> | 98% | 42,801 psi | 66% | 2687 fps | 95.7% |
| Norma URP | <<locked>> | 82% | 32,851 psi | 51% | 2398 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 41,336 psi | 64% | 2559 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 38,914 psi | 60% | 2543 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 48,733 psi | 75% | 2631 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,341 psi | 74% | 2648 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,417 psi | 81% | 2664 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,977 psi | 42% | 1526 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 54,520 psi | 84% | 2690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,292 psi | 62% | 2484 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,991 psi | 69% | 2661 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,477 psi | 56% | 2536 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,242 psi | 50% | 2408 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,767 psi | 57% | 2523 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 49,922 psi | 77% | 2602 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,497 psi | 67% | 2520 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 37,072 psi | 57% | 2448 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 45,397 psi | 70% | 2664 fps | 95% |
| Rottweil R 907 | <<locked>> | 86% | 42,772 psi | 66% | 2526 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,492 psi | 56% | 2405 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,238 psi | 71% | 2595 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,814 psi | 64% | 2507 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,189 psi | 60% | 2480 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,014 psi | 58% | 2497 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,108 psi | 72% | 2608 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,281 psi | 70% | 2589 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,123 psi | 72% | 2516 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,378 psi | 61% | 2392 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,669 psi | 63% | 2451 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 52,982 psi | 82% | 2697 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,572 psi | 72% | 2513 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,949 psi | 72% | 2605 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 37,681 psi | 58% | 2451 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 27,485 psi | 42% | 2293 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 43,236 psi | 67% | 2595 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 53,055 psi | 82% | 2566 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,514 psi | 73% | 2507 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,352 psi | 67% | 2500 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,830 psi | 67% | 2510 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,998 psi | 55% | 2392 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 32,024 psi | 49% | 2346 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 48,936 psi | 75% | 2615 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,032 psi | 65% | 2500 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,721 psi | 52% | 2398 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 30,589 psi | 47% | 2392 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,807 psi | 49% | 2323 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 48,776 psi | 75% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 39,784 psi | 61% | 2549 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,500 psi | 44% | 2395 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,759 psi | 69% | 2592 fps | 99.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 103 powders for .300 Rem. SA Ultra Mag. loaded with the .308 | 180gr | Sierra SPT Pro-Hunter. Alliant Reloder-17 delivers the highest muzzle velocity at 2,913 fps; across all powders the maximum-charge window runs from 1,667 fps to 2,913 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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.