Purchased a SEF 12x15 coil for my e-trac about a moth ago really love it ,found a 1782 one real a few weeks back in a area i have pounded with my pro coil and today i found a nice 1838 half dime about 8 or 9 " this setup -etrac +12x15 sef loves silver, really hits hard but you do have to swing it slow,it is a bit heavy, but for a larger coil it does separate very well don't get me wrong i like the stock 11"pro coil and use it in the woods all the time,i also have a 6x8 sef coil that also works great in iron infested areas ,but it does lose some dept HH, TONY C