Load Specifications
Load data in caliber .270 Win. with .277 | 140gr | Rhino Solid Shank bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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 2495 | <<locked>> | 84% | 54,824 psi | 88% | 2766 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 52,939 psi | 85% | 2772 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,545 psi | 79% | 2802 fps | 98.7% |
| Accurate 4064 | <<locked>> | 86% | 55,129 psi | 88% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,579 psi | 89% | 2917 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 54,418 psi | 87% | 2841 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,448 psi | 89% | 2844 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 52,968 psi | 85% | 2894 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,404 psi | 87% | 2966 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,173 psi | 90% | 2871 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 52,910 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,231 psi | 90% | 2972 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,795 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,840 psi | 90% | 2940 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,313 psi | 79% | 2877 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,354 psi | 74% | 2822 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,756 psi | 65% | 2733 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,982 psi | 85% | 3012 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,157 psi | 87% | 2858 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 53,359 psi | 86% | 2835 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,313 psi | 79% | 2877 fps | 96.5% |
| Bofors RP7 | <<locked>> | 90% | 53,113 psi | 85% | 2812 fps | 98% |
| Hodgdon H380 | <<locked>> | 86% | 53,824 psi | 86% | 2848 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 54,230 psi | 87% | 2910 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 90% | 54,433 psi | 87% | 2874 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 82% | 54,984 psi | 88% | 2851 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,333 psi | 90% | 2890 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,882 psi | 88% | 2887 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,331 psi | 87% | 2946 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 58% | 1768 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,115 psi | 90% | 2854 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,405 psi | 89% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,911 psi | 88% | 2828 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,433 psi | 87% | 2812 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 53,766 psi | 86% | 2844 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,708 psi | 88% | 2841 fps | 98.6% |
| IMR 4831 | <<locked>> | 96% | 56,043 psi | 90% | 2910 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,244 psi | 87% | 2867 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 56,391 psi | 90% | 2881 fps | 95.9% |
| Lovex D073.6 | <<locked>> | 82% | 54,592 psi | 88% | 2818 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,359 psi | 86% | 2769 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,998 psi | 88% | 2822 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,549 psi | 87% | 2838 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 55,738 psi | 89% | 2877 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,031 psi | 66% | 2648 fps | 96.9% |
| Norma 201 | <<locked>> | 82% | 53,243 psi | 85% | 2789 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,679 psi | 86% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,840 psi | 90% | 2881 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,288 psi | 87% | 2890 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 52,141 psi | 84% | 2963 fps | 98.4% |
| Norma URP | <<locked>> | 94% | 54,273 psi | 87% | 2900 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 56,376 psi | 90% | 2904 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 52,968 psi | 85% | 2897 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,767 psi | 59% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,911 psi | 86% | 2831 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,592 psi | 86% | 2904 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,330 psi | 86% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,187 psi | 88% | 2936 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,882 psi | 86% | 2963 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 53,795 psi | 86% | 2789 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,258 psi | 85% | 2828 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,027 psi | 88% | 2871 fps | 96.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,766 psi | 88% | 2923 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 53,113 psi | 85% | 2812 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,549 psi | 87% | 2838 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,592 psi | 88% | 2818 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,998 psi | 88% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,738 psi | 89% | 2877 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,911 psi | 88% | 2890 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,637 psi | 89% | 2848 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,420 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,244 psi | 87% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,926 psi | 88% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,563 psi | 87% | 2792 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2917 fps | 97.5% |
| Somchem S335 | <<locked>> | 82% | 53,853 psi | 86% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,114 psi | 88% | 2835 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,476 psi | 86% | 2825 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 52,982 psi | 85% | 2904 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,651 psi | 89% | 2904 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 54,708 psi | 88% | 2707 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,143 psi | 87% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,331 psi | 87% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,897 psi | 88% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 52,837 psi | 85% | 2841 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,008 psi | 77% | 2762 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 86% | 55,985 psi | 90% | 2812 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,506 psi | 89% | 2897 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,083 psi | 84% | 2904 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,275 psi | 90% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,505 psi | 87% | 2917 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,785 psi | 67% | 2864 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,420 psi | 90% | 2874 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,301 psi | 84% | 2841 fps | 96.8% |
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 2495 | <<locked>> | 80% | 48,225 psi | 77% | 2671 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,311 psi | 74% | 2657 fps | 96.4% |
| Accurate 3100 | <<locked>> | 92% | 37,507 psi | 60% | 2575 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 45,629 psi | 73% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,345 psi | 55% | 2516 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 80% | 51,198 psi | 82% | 2792 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,294 psi | 69% | 2638 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 46,673 psi | 75% | 2779 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,282 psi | 76% | 2844 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,555 psi | 70% | 2664 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,731 psi | 75% | 2733 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,910 psi | 54% | 2526 fps | 96.6% |
| Alliant Reloder-17 | 47.4 gr | 80% | 38,116 psi | 61% | 2654 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,050 psi | 74% | 2772 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,977 psi | 74% | 2815 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,021 psi | 45% | 2385 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,868 psi | 58% | 2612 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,389 psi | 55% | 2625 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,720 psi | 81% | 2802 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 43,845 psi | 70% | 2677 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 45,977 psi | 74% | 2815 fps | 95.6% |
| Bofors RP7 | <<locked>> | 82% | 41,249 psi | 66% | 2595 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 44,367 psi | 71% | 2684 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 38,856 psi | 62% | 2621 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 84% | 44,744 psi | 72% | 2700 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 51,735 psi | 83% | 2802 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,357 psi | 50% | 2425 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,138 psi | 77% | 2782 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 40,799 psi | 65% | 2690 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,919 psi | 43% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,342 psi | 79% | 2749 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,895 psi | 83% | 2779 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,527 psi | 73% | 2674 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,935 psi | 77% | 2700 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 41,829 psi | 67% | 2628 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,147 psi | 64% | 2572 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 33,170 psi | 53% | 2474 fps | 96.2% |
| IMR 4895 | <<locked>> | 80% | 47,935 psi | 77% | 2762 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,721 psi | 85% | 2825 fps | 95.1% |
| Lovex D073.6 | <<locked>> | 80% | 50,952 psi | 82% | 2762 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,241 psi | 81% | 2717 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,672 psi | 73% | 2674 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,768 psi | 61% | 2523 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 38,334 psi | 61% | 2556 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 36,158 psi | 58% | 2546 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 50,038 psi | 80% | 2740 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,444 psi | 81% | 2736 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,108 psi | 74% | 2720 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 47,500 psi | 76% | 2776 fps | 95.6% |
| Norma MRP | <<locked>> | 92% | 39,653 psi | 64% | 2713 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 34,360 psi | 55% | 2516 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 46,021 psi | 74% | 2736 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 38,072 psi | 61% | 2612 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,383 psi | 44% | 1617 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,425 psi | 71% | 2664 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,980 psi | 80% | 2844 fps | 99.9% |
| ReloadSwiss RS 60 | 47.4 gr | 80% | 40,538 psi | 65% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,881 psi | 54% | 2530 fps | 96% |
| ReloadSwiss RS 70 | 48.1 gr | 80% | 33,388 psi | 54% | 2530 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 47,747 psi | 77% | 2694 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,220 psi | 66% | 2621 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 51,358 psi | 82% | 2808 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 94% | 44,991 psi | 72% | 2753 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 82% | 41,249 psi | 66% | 2595 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,768 psi | 61% | 2523 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,952 psi | 82% | 2762 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,672 psi | 73% | 2674 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,334 psi | 61% | 2556 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,076 psi | 67% | 2667 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,040 psi | 83% | 2792 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,429 psi | 79% | 2759 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,908 psi | 82% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,844 psi | 69% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,421 psi | 63% | 2520 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,585 psi | 71% | 2749 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 50,676 psi | 81% | 2674 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,590 psi | 83% | 2779 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,698 psi | 67% | 2621 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,792 psi | 49% | 2467 fps | 98.5% |
| Somchem S385 | <<locked>> | 92% | 42,757 psi | 69% | 2677 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 51,416 psi | 82% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,572 psi | 76% | 2657 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,979 psi | 77% | 2671 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,769 psi | 64% | 2556 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,752 psi | 57% | 2516 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 98% | 44,773 psi | 72% | 2707 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 46,383 psi | 74% | 2664 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,302 psi | 57% | 2520 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 30,589 psi | 49% | 2464 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,041 psi | 56% | 2490 fps | 98.7% |
| Winchester 760 | <<locked>> | 82% | 39,059 psi | 63% | 2625 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,137 psi | 45% | 2470 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,356 psi | 79% | 2766 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,252 psi | 73% | 2717 fps | 95.1% |
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 108 powders for .270 Win. loaded with the .277 | 140gr | Rhino Solid Shank. Alliant Reloder-26 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,768 fps to 3,012 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.277" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .270 Win. with the .277 | 140gr | Rhino Solid Shank they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Hodgdon H1000 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.