Monte,a quality post as usual,same as yourself all my machine have been changed over to smaller than stock coils,the largest coil that i have on my main machines is the 9'' Deus coil,only reason is that is my favourite everyday machine and they dont make any smaller dia coils.

Next biggest coil that i have installed and used is the 7'' although its a 8x6'' coil on my Nexus,that is only used on pasture permission,but because of the way the Nexus works rather than use just 12volts into the coil its a similar voltage increase similar too the older Nautilus machines but the Nexus increases even beyond the Nautilus power,this gives its unbelievable depth and because of using the smaller coil you dont suffer the ground matrix swamping the same way as larger coils do,its basically like having a high power laser on the end of your detector its that good.

The other coils that i use on a regular basis is the 5'' T2 coil and the 6'' Coiltek both of course on the T2 and specifically good combinations on roman/saxon sites as they usually have massive amounts of trash,so a small coil is the only thing that you can use,you could use a stock size coil but the you start increasing the chances of 'nulled signals' which is a total waste of time,so best using much smaller coils.

Although i do have a a substantial amount of coils the ones that are used and have been used for some time are on average about the 7'' size which is roughly what you also use,the smallest i think is the 4'' Concentric coil on my Tesoro/Laser machine but that is mainly used when the trash is extreme which it can be in some cases and the only coil that can be used and will hit the desirable silver hammered coins that i am after.I still think the best killer combination is the T2 with the 5'' coil on,the depth from that coil is amazing and found me a few stunning celtic gold staters especially after the crops have come off and the only coil that can get in between the stubble rows is a small coil,hence we call them stubble busters.