10 x 12 SEF coil.
At first I was not used to the way the SEF coil hit hard and fast...like a small 6" coil. I heard so many more crisp sounds because the SEF coil separated so much better than my stock SE coil
.
One day though...I went back to one of my beat up parks and just made myself leave the 1050 coil and the stock coil at home...forcing me to stay with the 10 x 12 SEF no matter what.
What an eye opening day that was.

After only a couple of hours I got used to the crisper sounds I was hearing at substantial depths...and had a very productive day from a park that I hadn't found silver at in a long time.
Over the next 4 hunts...I found 11 silver from some very pounded sites...and it was then that I knew I had a killer coil.
Right about that time..the new minelab pro coil came out. Well even though I had a great coil to use...in the back of my mind I wondered if the pro coil was better.
Anyway...I spent $200 and ordered the new pro coil so I could do direct side by side comparisons and see which one worked better for
me. I just had to know.
For me and the settings I run...and in my soil...the 10 x 12 SEF coil beat the pro coil hands down in everything except the weight.
It hit harder...separated better...sounded better over deep targets...and seemed to ID better over deep targets.
One thing I disliked about the pro coil...in fact it drove me nuts...was the fact that I dug a lot of "ghost holes". I have no idea why...but I would get some nice signals...and they repeated around the hole...and I would have sworn it was deep silver. When I got the hole dug...nothing there. This just didn't happen some times...it happened often to the point that I just stopped using it for a while. I never had that problem with the 10 x 12 SEF coil.
With the settings I run...I get some falsing and chirping...and it's up to me to be able to discern between good deep hits from falsing. About 99% of the time with the SEF coil...if I dig a deep rusty nail or piece of junk...I already knew it was "iffy" before I dug it.
All of this being said...I have since spent a lot more time on the pro coil...
and it's a WINNER
Early in the year...I had a 2 Seated day ...and it was with the pro coil. I don't know how many years it's been since I found 2 seated dimes in a day....but the Pro coil sniffed them both out that day. As a matter of fact... if Guvner hadn't of found the Merc I was looking for...I would have completed the silver slam.
Because of him however

...I ended up with 2 seated dimes...a barber dime...a Roosey...but NO Merc.
The coil I reach for...well I guess I don't reach for it because it stays on my SE most of the time

...is the 10 x 12 SEF coil.
It is my favorite everyday coil...and the pro coil comes in second...but again...
the Pro coil is a GREAT coil and I use it often.
The SEF coil just seems to work better for me in my soil and at my sites.