Okay, you asked for it! Sit back and relax, this won't hurt a bit!
Ace 250 tips, from THE One and Only Bill Revis:
Somewhere on this forum I spoke of it when I field tested it way back. It's very sensitive so run your sensitivity at four bars to start with. Target response and recovery is lightning fast so it's virtually impossible too swing to fast to miss targets. This makes the Ace 250 a great candidate for competition hunting.
Also, if you whip the coil it will go somewhat deeper. Careful scanning still works best, though.
( And that is one of the great things about the Ace 250 - it will allow both tactics.)
Let me add here that my testing corroborates the info given on fast swing speeds. In fact, deep targets are often picked up more reliably by fast scanning than with slow swings. On my wedding band, which is 14K and thus just above nickels in conductivity - that is to say a weak conductor - the only way to pick it up at anything over 5