Load Specifications
Load data in caliber 7 x 66 SE v. Hofe with .284 | 160gr | Speer Deep Curl Soft Point bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Accurate MAGPRO.
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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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 56,811 psi | 89% | 2946 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,595 psi | 90% | 2969 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 54,476 psi | 85% | 3045 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 90% | 55,347 psi | 87% | 3048 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 54,752 psi | 86% | 2982 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,521 psi | 89% | 3051 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,520 psi | 85% | 3015 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,834 psi | 77% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,882 psi | 86% | 2972 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,462 psi | 85% | 2972 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,768 psi | 89% | 3048 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,476 psi | 85% | 2953 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,070 psi | 85% | 3022 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,795 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 3028 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,464 psi | 90% | 3009 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 55,724 psi | 87% | 3028 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 3084 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 56,768 psi | 89% | 3048 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,680 psi | 87% | 2917 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,043 psi | 88% | 3041 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 55,492 psi | 87% | 2972 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 55,970 psi | 88% | 2982 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,042 psi | 86% | 2966 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,158 psi | 86% | 2894 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,768 psi | 89% | 3163 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,869 psi | 88% | 3009 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 59% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,479 psi | 90% | 2959 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,985 psi | 89% | 2936 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 54,288 psi | 85% | 2910 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,710 psi | 89% | 2959 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 54,534 psi | 85% | 3028 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,411 psi | 70% | 2881 fps | 98.1% |
| Lovex S065 | <<locked>> | 82% | 54,491 psi | 85% | 2884 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,144 psi | 88% | 2933 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 54,418 psi | 85% | 2913 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,085 psi | 86% | 2963 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 44,817 psi | 70% | 2907 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 56,753 psi | 89% | 3064 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,840 psi | 88% | 2949 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,405 psi | 87% | 3051 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 54,853 psi | 86% | 2963 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 53,722 psi | 84% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 1913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 53,911 psi | 84% | 2940 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,173 psi | 88% | 3025 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,740 psi | 90% | 3156 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,782 psi | 89% | 3114 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 55,738 psi | 87% | 2949 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 57,653 psi | 90% | 3015 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 55,680 psi | 87% | 2917 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,491 psi | 85% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,144 psi | 88% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,029 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,217 psi | 90% | 3015 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 57,116 psi | 90% | 2940 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 56,753 psi | 89% | 2953 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,389 psi | 85% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,464 psi | 90% | 2940 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,638 psi | 90% | 2966 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,840 psi | 89% | 2949 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,739 psi | 89% | 2982 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,376 psi | 88% | 3064 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 96% | 56,507 psi | 89% | 3045 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,464 psi | 90% | 3114 fps | 98.9% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 3104 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,971 psi | 89% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,492 psi | 87% | 2972 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,000 psi | 89% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,085 psi | 85% | 2927 fps | 99.7% |
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% | 37,913 psi | 59% | 2615 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 50,357 psi | 79% | 2861 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,205 psi | 65% | 2789 fps | 96.9% |
| Accurate MAGPRO | 67.9 gr | 82% | 41,771 psi | 65% | 2789 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 41,930 psi | 66% | 2743 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 37,434 psi | 59% | 2674 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 88% | 36,347 psi | 57% | 2644 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 84% | 28,906 psi | 45% | 2484 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,211 psi | 76% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,887 psi | 66% | 2736 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,826 psi | 59% | 2684 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,593 psi | 57% | 2638 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,662 psi | 50% | 2559 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,582 psi | 64% | 2792 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,471 psi | 74% | 2959 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,747 psi | 75% | 2831 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 35,302 psi | 55% | 2618 fps | 95.9% |
| Bofors RP30 | <<locked>> | 86% | 35,708 psi | 56% | 2661 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 37,826 psi | 59% | 2684 fps | 97% |
| Bofors RP7 | <<locked>> | 80% | 52,344 psi | 82% | 2861 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,664 psi | 54% | 2602 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 51,953 psi | 81% | 2917 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 39,929 psi | 63% | 2680 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,247 psi | 62% | 2664 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,426 psi | 71% | 2743 fps | 100% |
| Hodgdon Retumbo | 64.2 gr | 82% | 32,967 psi | 52% | 2641 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 51,953 psi | 81% | 2946 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 44% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,688 psi | 75% | 2795 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,650 psi | 84% | 2884 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,703 psi | 75% | 2802 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,466 psi | 65% | 2680 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 82% | 38,754 psi | 61% | 2717 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,245 psi | 57% | 2697 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 51,271 psi | 80% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,719 psi | 78% | 2828 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,663 psi | 51% | 2487 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 48,138 psi | 75% | 2844 fps | 99% |
| Norma 217 | <<locked>> | 90% | 31,937 psi | 50% | 2602 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 39,740 psi | 62% | 2753 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 49,226 psi | 77% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,723 psi | 56% | 2654 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 48,095 psi | 75% | 2848 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,981 psi | 50% | 2536 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 45% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,401 psi | 79% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,689 psi | 76% | 2907 fps | 100% |
| ReloadSwiss RS 76 | 67.1 gr | 80% | 29,921 psi | 47% | 2546 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,945 psi | 66% | 2841 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 43,192 psi | 68% | 2723 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 41,466 psi | 65% | 2726 fps | 98% |
| Rottweil R 907 | <<locked>> | 80% | 52,344 psi | 82% | 2861 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,271 psi | 80% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,719 psi | 78% | 2828 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,241 psi | 79% | 2785 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,133 psi | 64% | 2723 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 43,874 psi | 69% | 2710 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 46,499 psi | 73% | 2799 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,872 psi | 66% | 2707 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 80% | 50,488 psi | 79% | 2835 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,376 psi | 57% | 2575 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 80% | 49,922 psi | 78% | 2841 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,886 psi | 64% | 2717 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,740 psi | 62% | 2743 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 84% | 37,608 psi | 59% | 2680 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 92% | 43,250 psi | 68% | 2851 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 98% | 50,691 psi | 79% | 3038 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,792 psi | 78% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,953 psi | 81% | 2917 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,301 psi | 52% | 2680 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,435 psi | 60% | 2631 fps | 97.1% |
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 77 powders for 7 x 66 SE v. Hofe loaded with the .284 | 160gr | Speer Deep Curl Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,163 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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. Hodgdon Retumbo, ReloadSwiss RS 76, Accurate MAGPRO rank at the top here: for 7 x 66 SE v. Hofe with the .284 | 160gr | Speer Deep Curl Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.