Dave,both Rick and S#48 give good advice.I have changed back and fourth with coils and would have to conclude for land hunting the Tornado 10 inch coil is hard to beat for depth.If you have the older heavier BBS 1000 auction it off and get the Tornado 10 inch.The 8 inch Coinsearch coil has great performance,but my favorite small coil is the Tornado 800 a 7 inch coil.The Sovereign XS is my favorite stable simple and locks on to deep targets.Like everyone here I,m always looking for the magic bullet,which is,research to find a site, hard work in the field,and luck.By the way there is a spacer on the wing nut side make sure the spacer is used to prevent cracking the coil ears.