Not at all, the round tabs seem to lock up real nicely and I usually see them at 161 or 167 the new square tabs seem to lock up at 171 and the older square tabs do move a bit but tend to be in the low 140 range with some slight movement between 142 /144 , I see gum wrappers lock up on a solid 86 and ketchup packets seem to fall at 121 , now they can vary a bit , but these are the numbers that I always see. there is other junk as well and I cant remember it all, the mickeys big mouth and natural light big bottle caps seem to always be 179 with absolutely no bounce, the key is the tones though, It is quite conceivable that all of those number I mention could in fact be shared with that of a good target but it is the tones that give you the most info. when I hit a new spot I like to dig some '' warm up junk '' to see what I am up against, one thing to me that sounds a lot like gold is them little foil lids and they seem to wanna be right at 91 . another thing I can be tricked by is the beaver tail when it is deep and crushed or twisted and they seem to love the 131 number, nickles can be bouncy too and I have dug nickles as high as 158 but they have a very distinct sound so in most cases you can tell a nickel with a fair amount of ease. I good bit of advice I was told was to remember is that nickles read different when you switch bands , in band 2 the nickles are fairly consistently seen at 145 but in band 1 they read higher by a few numbers and I find this true for square tabs as well. The thing to remember is the meter is just a tool to help you decipher what you are hearing a little better, do not handcuff yourself into only digging certain numbers listen carefully to the tones being put out as you pass over the target and at that point glance down at the meter and see what it is doing, because some targets depending on how long they have been in or how they are sitting in the ground can indeed not show the ''typical numbers'', It really is all about the tones but the meter is a real nice tool and it coupled with the tones makes digging junk almost a non issue. this is not to say I never dig junk because I dig a ton, simply because I get curious. 99 percent of the time I have the feeling it is going to be junk. The junk I tend to always dig is foil based junk due to the fact it has that super low goldish sound and I would hate to miss a good ring.