Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 150gr | RWS Speed Tip Professional bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, 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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,259 psi | 87% | 3005 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,579 psi | 89% | 3041 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,724 psi | 89% | 3163 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 57,566 psi | 90% | 3163 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 82% | 57,392 psi | 90% | 2995 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,276 psi | 90% | 3097 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 55,114 psi | 86% | 3104 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 2992 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,034 psi | 69% | 2953 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,493 psi | 90% | 3094 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,464 psi | 90% | 3097 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,766 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,797 psi | 89% | 3087 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,143 psi | 86% | 3100 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,173 psi | 88% | 3068 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,579 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,884 psi | 89% | 3163 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,768 psi | 89% | 3058 fps | 96.6% |
| Bofors RP15 | <<locked>> | 96% | 54,099 psi | 85% | 3081 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,561 psi | 81% | 3068 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 55,143 psi | 86% | 3100 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 55,216 psi | 87% | 2982 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,346 psi | 85% | 3084 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 54,418 psi | 85% | 3035 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 57,174 psi | 90% | 3051 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 54,984 psi | 86% | 3038 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 53,766 psi | 84% | 3018 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,711 psi | 90% | 3012 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,433 psi | 85% | 3205 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,723 psi | 86% | 3074 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 58% | 1903 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,768 psi | 89% | 3022 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,579 psi | 89% | 3005 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 56,710 psi | 89% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,985 psi | 88% | 3018 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 56,623 psi | 89% | 3140 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 57,348 psi | 90% | 3005 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,579 psi | 87% | 3002 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3018 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,201 psi | 85% | 3025 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 39,726 psi | 62% | 2877 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 54,911 psi | 86% | 3120 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,926 psi | 86% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,537 psi | 90% | 3163 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 88% | 57,305 psi | 90% | 3081 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,912 psi | 88% | 3094 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,840 psi | 59% | 1949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,623 psi | 89% | 3064 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,839 psi | 86% | 3091 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 3202 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,198 psi | 79% | 3081 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 82% | 56,579 psi | 89% | 2982 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,795 psi | 86% | 3005 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 56,376 psi | 88% | 3077 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 55,216 psi | 87% | 2982 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,348 psi | 90% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,579 psi | 87% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,260 psi | 88% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,550 psi | 89% | 2956 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,941 psi | 88% | 3071 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 56,101 psi | 88% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,420 psi | 88% | 2999 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 55,288 psi | 87% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,710 psi | 89% | 3041 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 57,479 psi | 90% | 2946 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,710 psi | 89% | 3012 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,362 psi | 88% | 3022 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 55,912 psi | 88% | 3018 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,824 psi | 86% | 3041 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,752 psi | 86% | 3114 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 98% | 54,592 psi | 86% | 3094 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3084 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,217 psi | 88% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,679 psi | 86% | 3041 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,795 psi | 84% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,811 psi | 89% | 3041 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 34,447 psi | 54% | 2605 fps | 97.5% |
| Accurate 4350 | <<locked>> | 80% | 46,151 psi | 72% | 2867 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 39,856 psi | 62% | 2831 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 86% | 43,540 psi | 68% | 2900 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 53,896 psi | 84% | 2940 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,319 psi | 60% | 2733 fps | 96% |
| ADI AR 2213 | <<locked>> | 86% | 41,974 psi | 66% | 2848 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 40,350 psi | 63% | 2802 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 31,908 psi | 50% | 2638 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,841 psi | 61% | 2736 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,077 psi | 69% | 2874 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,952 psi | 80% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,479 psi | 60% | 2730 fps | 96.1% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,608 psi | 57% | 2726 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,054 psi | 52% | 2635 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,689 psi | 45% | 2533 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,114 psi | 57% | 2776 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,330 psi | 84% | 2995 fps | 95.8% |
| Bofors RP15 | <<locked>> | 84% | 36,477 psi | 57% | 2723 fps | 95.4% |
| Bofors RP30 | <<locked>> | 92% | 39,233 psi | 61% | 2818 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 36,608 psi | 57% | 2726 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 48,762 psi | 76% | 2871 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 38,580 psi | 60% | 2766 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 47,616 psi | 75% | 2917 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 50,140 psi | 79% | 2933 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 41,916 psi | 66% | 2789 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,019 psi | 69% | 2835 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,597 psi | 65% | 2753 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,142 psi | 54% | 2736 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 47,268 psi | 74% | 2943 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 44% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,048 psi | 69% | 2799 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,922 psi | 78% | 2894 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 43,859 psi | 69% | 2812 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,814 psi | 64% | 2730 fps | 95% |
| IMR 7828 SSC | <<locked>> | 86% | 40,408 psi | 63% | 2825 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 47,703 psi | 75% | 2844 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 45,919 psi | 72% | 2831 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 29,631 psi | 46% | 2474 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 44,092 psi | 69% | 2835 fps | 97.5% |
| Norma 217 | <<locked>> | 94% | 32,445 psi | 51% | 2684 fps | 95.1% |
| Norma MRP | 62.8 gr | 80% | 35,853 psi | 56% | 2736 fps | 96.8% |
| Norma URP | <<locked>> | 80% | 45,121 psi | 71% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 40,001 psi | 63% | 2825 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 43,932 psi | 69% | 2848 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 33,301 psi | 52% | 2638 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 45% | 1745 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,905 psi | 72% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,222 psi | 69% | 2907 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,330 psi | 52% | 2713 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,076 psi | 68% | 2936 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 52,997 psi | 83% | 2930 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,740 psi | 62% | 2713 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 37,710 psi | 59% | 2713 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 48,762 psi | 76% | 2871 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,703 psi | 75% | 2844 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 45,919 psi | 72% | 2831 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,939 psi | 83% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,615 psi | 73% | 2789 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,376 psi | 59% | 2707 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 52,895 psi | 83% | 2923 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,265 psi | 68% | 2759 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 42,061 psi | 66% | 2805 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,319 psi | 60% | 2697 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 50,531 psi | 79% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,630 psi | 73% | 2848 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,520 psi | 56% | 2625 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 45,992 psi | 72% | 2851 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,043 psi | 58% | 2713 fps | 99.6% |
| Vihtavuori N560 | 65.9 gr | 84% | 41,379 psi | 65% | 2854 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 41,510 psi | 65% | 2841 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 96% | 44,440 psi | 70% | 2949 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,585 psi | 71% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,790 psi | 75% | 2920 fps | 99.4% |
| Winchester StaBALL HD | 62.1 gr | 80% | 29,269 psi | 46% | 2648 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,507 psi | 59% | 2680 fps | 95.8% |
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 76 powders for 7 x 66 SE v. Hofe loaded with the .284 | 150gr | RWS Speed Tip Professional. Hodgdon Retumbo delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,205 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:10.0 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 150gr | RWS Speed Tip Professional they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.