Load Specifications
Load data in caliber .30-06 Ackley Improved with .308 | 150gr | Swift Scirocco bullet and 93 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, ReloadSwiss RS 52 and Hodgdon LEVERevolution.
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>> | 90% | 56,159 psi | 90% | 2864 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,275 psi | 90% | 2959 fps | 98.7% |
| Accurate 2460 | <<locked>> | 86% | 54,810 psi | 88% | 2887 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 53,359 psi | 86% | 2874 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 56,405 psi | 90% | 2949 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 53,359 psi | 86% | 2917 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,310 psi | 73% | 2848 fps | 96.4% |
| Accurate LT-30 | <<locked>> | 84% | 56,101 psi | 90% | 2812 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,142 psi | 85% | 2789 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,317 psi | 89% | 2953 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 98% | 56,028 psi | 90% | 2940 fps | 98.8% |
| ADI AR 2219 | <<locked>> | 82% | 53,011 psi | 85% | 2881 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,447 psi | 87% | 2904 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 90% | 54,230 psi | 87% | 2894 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 56,130 psi | 90% | 3018 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 54,766 psi | 88% | 3058 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,477 psi | 89% | 2966 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,985 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 56,188 psi | 90% | 2986 fps | 99% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,353 psi | 73% | 2854 fps | 96.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,562 psi | 84% | 3018 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,332 psi | 89% | 2808 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,897 psi | 88% | 2956 fps | 98.4% |
| Bofors RP3 | <<locked>> | 98% | 55,956 psi | 90% | 2982 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 53,606 psi | 86% | 2848 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 90% | 53,432 psi | 86% | 2936 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,056 psi | 88% | 3028 fps | 98.9% |
| Hodgdon H322 | <<locked>> | 86% | 55,216 psi | 89% | 2913 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 52,794 psi | 85% | 2887 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,824 psi | 86% | 2930 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 92% | 55,767 psi | 89% | 2963 fps | 99.5% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,669 psi | 67% | 2743 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 54,375 psi | 87% | 2989 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,621 psi | 56% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 53,737 psi | 86% | 2910 fps | 99.3% |
| IMR 3031 | <<locked>> | 92% | 54,795 psi | 88% | 2953 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,535 psi | 89% | 2923 fps | 98.9% |
| IMR 4198 | <<locked>> | 84% | 53,098 psi | 85% | 2789 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,323 psi | 69% | 2792 fps | 96% |
| IMR 4895 | <<locked>> | 94% | 54,143 psi | 87% | 2966 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 90% | 54,447 psi | 87% | 2904 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 86% | 54,723 psi | 88% | 2897 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 54,404 psi | 87% | 2930 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,637 psi | 89% | 2884 fps | 99.2% |
| Lovex S062 | <<locked>> | 96% | 55,143 psi | 88% | 2927 fps | 99.8% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,879 psi | 82% | 2851 fps | 96.1% |
| Norma 200 | <<locked>> | 82% | 56,014 psi | 90% | 2848 fps | 100% |
| Norma 201 | <<locked>> | 92% | 53,867 psi | 86% | 2897 fps | 99.7% |
| Norma 202 | <<locked>> | 92% | 54,230 psi | 87% | 2907 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,274 psi | 89% | 2969 fps | 99.2% |
| Norma URPᴾ | <<locked>> | 100% | 45,513 psi | 73% | 2844 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 96% | 55,999 psi | 90% | 2999 fps | 99.2% |
| Ramshot TAC | <<locked>> | 90% | 55,172 psi | 88% | 2917 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,157 psi | 87% | 2936 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,115 psi | 90% | 2910 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,751 psi | 56% | 1811 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,230 psi | 87% | 2894 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,534 psi | 87% | 2910 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 56,086 psi | 90% | 3051 fps | 99% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,217 psi | 90% | 3091 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,223 psi | 73% | 2864 fps | 96% |
| Rottweil R 901 | <<locked>> | 90% | 55,056 psi | 88% | 2890 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,302 psi | 87% | 2894 fps | 99.7% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,463 psi | 89% | 2966 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,879 psi | 82% | 2851 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,404 psi | 87% | 2930 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,143 psi | 88% | 2927 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,114 psi | 87% | 2861 fps | 99.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,391 psi | 90% | 2562 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,519 psi | 86% | 2894 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 53,954 psi | 87% | 2976 fps | 99% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,780 psi | 86% | 2851 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,316 psi | 85% | 2890 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,693 psi | 86% | 2920 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,072 psi | 90% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,840 psi | 90% | 2841 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,941 psi | 90% | 2946 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 55,013 psi | 88% | 2844 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 56,159 psi | 90% | 2940 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,173 psi | 90% | 2966 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,480 psi | 65% | 2789 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 88% | 55,970 psi | 90% | 2822 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,927 psi | 90% | 2835 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 53,258 psi | 85% | 2867 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,723 psi | 88% | 2884 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,244 psi | 87% | 2897 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,979 psi | 77% | 2848 fps | 96.8% |
| Vihtavuori N530 | <<locked>> | 90% | 55,230 psi | 89% | 2910 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 94% | 53,142 psi | 85% | 2881 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,891 psi | 75% | 2848 fps | 96.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,284 psi | 79% | 2838 fps | 98.8% |
| Winchester 748 | <<locked>> | 90% | 54,230 psi | 87% | 2953 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 53,229 psi | 85% | 2927 fps | 99.3% |
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% | 41,205 psi | 66% | 2628 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,823 psi | 85% | 2904 fps | 98.2% |
| Accurate 2460 | <<locked>> | 80% | 44,672 psi | 72% | 2726 fps | 99.8% |
| Accurate 2495 | <<locked>> | 80% | 33,736 psi | 54% | 2530 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 39,900 psi | 64% | 2671 fps | 99% |
| Accurate 4064 | <<locked>> | 80% | 31,923 psi | 51% | 2507 fps | 98.1% |
| Accurate 4350 | <<locked>> | 98% | 42,308 psi | 68% | 2789 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 49,617 psi | 80% | 2717 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,966 psi | 80% | 2736 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 37,913 psi | 61% | 2625 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 86% | 38,769 psi | 62% | 2625 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 49,763 psi | 80% | 2831 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,871 psi | 64% | 2641 fps | 97.6% |
| Alliant AR-Comp | <<locked>> | 80% | 38,711 psi | 62% | 2654 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,050 psi | 74% | 2844 fps | 98.4% |
| Alliant Power Pro 2000-MR | 51.9 gr | 86% | 41,829 psi | 67% | 2805 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 33,402 psi | 54% | 2539 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,630 psi | 75% | 2733 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 38,377 psi | 62% | 2654 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 98% | 42,685 psi | 68% | 2799 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 37,536 psi | 60% | 2713 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,544 psi | 78% | 2710 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 42,119 psi | 68% | 2730 fps | 95.7% |
| Bofors RP3 | <<locked>> | 82% | 32,619 psi | 52% | 2533 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,945 psi | 67% | 2644 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,855 psi | 61% | 2648 fps | 97.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 41,669 psi | 67% | 2782 fps | 96.2% |
| Hodgdon H322 | <<locked>> | 80% | 45,324 psi | 73% | 2759 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,209 psi | 74% | 2779 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 44,034 psi | 71% | 2759 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 38,145 psi | 61% | 2635 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,753 psi | 59% | 2631 fps | 95.6% |
| Hodgdon LEVERevolution | 47.3 gr | 80% | 34,069 psi | 55% | 2589 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,744 psi | 41% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,651 psi | 59% | 2585 fps | 95.8% |
| IMR 3031 | <<locked>> | 80% | 37,043 psi | 59% | 2648 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 38,464 psi | 62% | 2612 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 47,311 psi | 76% | 2703 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 40,625 psi | 65% | 2736 fps | 95.2% |
| IMR 4895 | <<locked>> | 82% | 36,825 psi | 59% | 2631 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 39,871 psi | 64% | 2641 fps | 97.6% |
| Lovex D073.5 | <<locked>> | 80% | 44,628 psi | 72% | 2730 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 80% | 36,230 psi | 58% | 2605 fps | 98.3% |
| Lovex S060 | <<locked>> | 80% | 38,740 psi | 62% | 2575 fps | 96% |
| Lovex S062 | <<locked>> | 80% | 33,591 psi | 54% | 2513 fps | 95.8% |
| Lovex S065 | <<locked>> | 98% | 47,863 psi | 77% | 2802 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 52,678 psi | 84% | 2802 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,130 psi | 60% | 2582 fps | 97% |
| Norma 202 | <<locked>> | 80% | 37,028 psi | 59% | 2598 fps | 99% |
| Norma 203B | <<locked>> | 84% | 37,695 psi | 60% | 2641 fps | 95.7% |
| Norma URP | <<locked>> | 98% | 42,728 psi | 69% | 2792 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 84% | 37,260 psi | 60% | 2648 fps | 95.1% |
| Ramshot TAC | <<locked>> | 84% | 45,469 psi | 73% | 2746 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,856 psi | 62% | 2654 fps | 95.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,163 psi | 69% | 2687 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,947 psi | 42% | 1624 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,817 psi | 72% | 2740 fps | 99.5% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 51,024 psi | 82% | 2854 fps | 95.3% |
| ReloadSwiss RS 52 | 49.1 gr | 84% | 39,842 psi | 64% | 2753 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 30,908 psi | 50% | 2543 fps | 95.6% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 42,221 psi | 68% | 2805 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 40,828 psi | 65% | 2641 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 35,418 psi | 57% | 2536 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 86% | 34,896 psi | 56% | 2582 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 47,863 psi | 77% | 2802 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,230 psi | 58% | 2605 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 33,591 psi | 54% | 2513 fps | 95.8% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,239 psi | 76% | 2749 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,606 psi | 86% | 2530 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,082 psi | 80% | 2838 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 36,521 psi | 59% | 2638 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,311 psi | 76% | 2753 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 43,250 psi | 69% | 2713 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,492 psi | 59% | 2589 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,754 psi | 62% | 2556 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,778 psi | 51% | 2415 fps | 98.6% |
| Somchem S321 | <<locked>> | 80% | 42,670 psi | 68% | 2720 fps | 98.5% |
| Somchem S335 | <<locked>> | 80% | 38,319 psi | 61% | 2559 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 37,318 psi | 60% | 2598 fps | 95.3% |
| Somchem S355 | <<locked>> | 86% | 36,100 psi | 58% | 2595 fps | 95.7% |
| Somchem S365 | <<locked>> | 92% | 31,444 psi | 50% | 2562 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 43,961 psi | 70% | 2638 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,856 psi | 62% | 2562 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,084 psi | 55% | 2533 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 35,114 psi | 56% | 2533 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 82% | 30,182 psi | 48% | 2428 fps | 95% |
| Vihtavuori N160 | <<locked>> | 96% | 42,032 psi | 67% | 2733 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 39,784 psi | 64% | 2638 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 80% | 33,823 psi | 54% | 2516 fps | 98.1% |
| Vihtavuori N550 | <<locked>> | 98% | 44,063 psi | 71% | 2795 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 35,389 psi | 57% | 2556 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 38,638 psi | 62% | 2674 fps | 98.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,418 psi | 57% | 2582 fps | 95.6% |
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 110 powders for .30-06 Ackley Improved loaded with the .308 | 150gr | Swift Scirocco. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,772 fps to 3,091 fps. Accurate 4350 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 52, Hodgdon LEVERevolution rank at the top here: for .30-06 Ackley Improved with the .308 | 150gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Bofors RP7 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.