Load Specifications
Load data in caliber 8 mm Rem. Mag. with .323 | 220gr | A-Square MONO RN bullet and 87 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Vihtavuori N560 and Norma MRP.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 59,669 psi | 89% | 2779 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 60,176 psi | 90% | 2844 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 59,872 psi | 90% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,899 psi | 87% | 2825 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 58,682 psi | 88% | 2953 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 84% | 58,958 psi | 88% | 2779 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 58,479 psi | 88% | 2884 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 98% | 60,205 psi | 90% | 2949 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,920 psi | 70% | 2730 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,684 psi | 62% | 2694 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,869 psi | 85% | 2756 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 58,610 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 60,191 psi | 90% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,972 psi | 87% | 2874 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 59,930 psi | 90% | 2943 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 57,130 psi | 86% | 2854 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,620 psi | 79% | 2861 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,508 psi | 86% | 2946 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 58,160 psi | 87% | 2851 fps | 97% |
| Bofors RP15ᴾ | <<locked>> | 100% | 58,494 psi | 88% | 2923 fps | 99.8% |
| Bofors RP3 | <<locked>> | 82% | 57,972 psi | 87% | 2772 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,530 psi | 73% | 2802 fps | 98.5% |
| Bofors RP5 | <<locked>> | 98% | 59,930 psi | 90% | 2943 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 56,898 psi | 85% | 2776 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,808 psi | 78% | 2818 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 82% | 57,885 psi | 87% | 2795 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 59,538 psi | 89% | 2881 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 58,697 psi | 88% | 2838 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 96% | 60,191 psi | 90% | 2887 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 58,784 psi | 88% | 2867 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 58,827 psi | 88% | 2795 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,532 psi | 77% | 2927 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 56,173 psi | 84% | 2867 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,028 psi | 56% | 1722 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 58,508 psi | 88% | 2762 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 58,291 psi | 87% | 2815 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 58,175 psi | 87% | 2795 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 58,102 psi | 87% | 2815 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,261 psi | 86% | 2812 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 98% | 57,653 psi | 86% | 2927 fps | 99.3% |
| Lovex S062 | <<locked>> | 82% | 58,842 psi | 88% | 2749 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 58,856 psi | 88% | 2792 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,942 psi | 85% | 2792 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,679 psi | 80% | 2759 fps | 100% |
| Norma 203B | <<locked>> | 82% | 59,785 psi | 90% | 2812 fps | 100% |
| Norma 204 | <<locked>> | 90% | 59,495 psi | 89% | 2874 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 37,347 psi | 56% | 2625 fps | 97.7% |
| Norma MRP | <<locked>> | 96% | 59,828 psi | 90% | 2966 fps | 100% |
| Norma URP | <<locked>> | 90% | 59,959 psi | 90% | 2858 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 58,479 psi | 88% | 2946 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 90% | 58,769 psi | 88% | 2871 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,579 psi | 85% | 2877 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,739 psi | 57% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,595 psi | 86% | 2782 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 59,727 psi | 90% | 2877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,899 psi | 87% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 60,278 psi | 90% | 2936 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,011 psi | 78% | 2927 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,789 psi | 70% | 2808 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 84% | 58,044 psi | 87% | 2769 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 59,944 psi | 90% | 2854 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 94% | 57,522 psi | 86% | 2861 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 86% | 56,898 psi | 85% | 2776 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 58,856 psi | 88% | 2792 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 58,842 psi | 88% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,942 psi | 85% | 2792 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 59,611 psi | 89% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 58,160 psi | 87% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 58,291 psi | 87% | 2753 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,072 psi | 86% | 2858 fps | 99.8% |
| Somchem S355 | <<locked>> | 84% | 57,827 psi | 87% | 2766 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,899 psi | 87% | 2795 fps | 98.7% |
| Somchem S365 | <<locked>> | 92% | 60,365 psi | 90% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,899 psi | 87% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 59,045 psi | 89% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 58,117 psi | 87% | 2799 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,508 psi | 86% | 2815 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 82% | 59,509 psi | 89% | 2726 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 57,174 psi | 86% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 59,553 psi | 89% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 59,654 psi | 89% | 2963 fps | 99.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,114 psi | 83% | 2877 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 48,225 psi | 72% | 2815 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,696 psi | 86% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 59,756 psi | 90% | 2884 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 58,421 psi | 88% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 58,015 psi | 87% | 2831 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 56,028 psi | 84% | 2726 fps | 99.8% |
| Accurate 3100 | <<locked>> | 80% | 32,837 psi | 49% | 2375 fps | 97.4% |
| Accurate 4064 | <<locked>> | 80% | 56,405 psi | 85% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 44,121 psi | 66% | 2618 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 44,295 psi | 66% | 2707 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 52,359 psi | 78% | 2687 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,970 psi | 55% | 2497 fps | 96% |
| ADI AR 2213 | <<locked>> | 86% | 40,190 psi | 60% | 2598 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 38,537 psi | 58% | 2556 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 90% | 30,385 psi | 46% | 2405 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,359 psi | 80% | 2707 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,438 psi | 64% | 2625 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,675 psi | 73% | 2733 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,869 psi | 55% | 2490 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,085 psi | 53% | 2490 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,589 psi | 47% | 2405 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,615 psi | 41% | 2313 fps | 95.7% |
| Alliant Reloder-26 | 72.7 gr | 80% | 34,185 psi | 51% | 2533 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 51,387 psi | 77% | 2740 fps | 95.5% |
| Bofors RP15 | <<locked>> | 84% | 34,766 psi | 52% | 2484 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 54,331 psi | 81% | 2723 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 37,144 psi | 56% | 2572 fps | 95.5% |
| Bofors RP5 | <<locked>> | 82% | 35,085 psi | 53% | 2490 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 47,166 psi | 71% | 2618 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 36,869 psi | 55% | 2520 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 54,302 psi | 81% | 2743 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,832 psi | 69% | 2664 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 48,515 psi | 73% | 2677 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 40,219 psi | 60% | 2546 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,163 psi | 63% | 2589 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,929 psi | 60% | 2510 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 34,824 psi | 52% | 2562 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 45,136 psi | 68% | 2687 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 42% | 1539 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 55,129 psi | 83% | 2717 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,685 psi | 64% | 2556 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,428 psi | 73% | 2644 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 42,105 psi | 63% | 2566 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,945 psi | 63% | 2546 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 38,566 psi | 58% | 2575 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 55,477 psi | 83% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 46,137 psi | 69% | 2598 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 44,367 psi | 67% | 2589 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 28,398 psi | 43% | 2260 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 56,130 psi | 84% | 2762 fps | 100% |
| Norma 204 | <<locked>> | 80% | 42,395 psi | 64% | 2589 fps | 97.5% |
| Norma 217 | <<locked>> | 96% | 32,706 psi | 49% | 2507 fps | 95.9% |
| Norma MRP | 70.6 gr | 80% | 34,185 psi | 51% | 2500 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 43,439 psi | 65% | 2605 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 38,101 psi | 57% | 2579 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 42,177 psi | 63% | 2602 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 86% | 33,910 psi | 51% | 2464 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 42% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 54,070 psi | 81% | 2733 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,663 psi | 77% | 2776 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,063 psi | 66% | 2638 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,163 psi | 63% | 2651 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 31,633 psi | 47% | 2474 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 43,555 psi | 65% | 2743 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 51,169 psi | 77% | 2674 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 38,392 psi | 58% | 2480 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 36,172 psi | 54% | 2477 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 47,166 psi | 71% | 2618 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,137 psi | 69% | 2598 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 55,477 psi | 83% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 44,367 psi | 67% | 2589 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,359 psi | 78% | 2730 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,488 psi | 77% | 2556 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,092 psi | 68% | 2546 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,839 psi | 54% | 2474 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 51,111 psi | 77% | 2671 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 41,640 psi | 62% | 2523 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 40,335 psi | 60% | 2566 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,825 psi | 55% | 2464 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 48,820 psi | 73% | 2595 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,773 psi | 67% | 2598 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,939 psi | 51% | 2395 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 55,941 psi | 84% | 2684 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 44,193 psi | 66% | 2605 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 35,360 psi | 53% | 2477 fps | 99.6% |
| Vihtavuori N560 | 74.1 gr | 84% | 39,508 psi | 59% | 2605 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 39,436 psi | 59% | 2595 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 98% | 44,933 psi | 67% | 2753 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,816 psi | 66% | 2562 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,021 psi | 69% | 2667 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,934 psi | 42% | 2418 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 35,853 psi | 54% | 2444 fps | 95.7% |
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 92 powders for 8 mm Rem. Mag. loaded with the .323 | 220gr | A-Square MONO RN. Winchester StaBALL HD delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,989 fps. ADI AR 2217 gives the best case fill at 100 %, and 92 of the 92 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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 Reloder-26, Vihtavuori N560, Norma MRP rank at the top here: for 8 mm Rem. Mag. with the .323 | 220gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.