Those were supposed to be from a Chem-4 incross. I am wondering in breeders descriptions, when they use references like IBL or incross, is that the same? Is an inbread line considered more or less stable?. . . It's confusing.
Yes, it is confusing.
I've already explained what an "inbred line" is above. The term is synonymous with "true breeding line", and analogous to a "purebred" animal (though not exactly the same).
Yes, a true inbred line should be "stable", meaning that if you crossed any two plants from an inbred line, the offspring should be similar to the parents.
An "incross" is a little different. That means you're crossing a plant to another one from the same lineage. If you do enough incrossing, you could create a stable line.
This is contrasted to an "outcross", which is crossing a plant to a totally different line to introduce new traits.
A chem-4 incross is either chem4 x chem4, or some offspring of chem4 crossed to some other offspring of chem4.
Let me explain further with a relevant example.
Lets say you have a bunch of Petrolia Headstash ceeds. These plants are all similar, and if you cross any two of them, you'll get more Petrolia Headstash plants. PH is an "inbred line".
Now lets say you want to create something different. So you cross your Petrolia Headstash with Killer New Haven (a different inbred line) to create a PH x NH F1 generation. This is an OUTCROSS. . .you're crossing your given line with something entirely unrelated with the idea of creating something new with the best traits of each parent.
Now, you want to refine this further, so you cross two of your F1s. . .this is now an "incross", you're crossing two plants of the same lineage.
If you do this sort of thing enough times, you'll generate an F2, F3, F4, F5, etc, and eventually with good selection, you'll create an entirely new inbred line, in this case herijuana.
Herijuana will have some traits from each of its two ancestors, PH and KNH, but it will breed "true" such that all herijuana plants will be similar and offspring of any two should be similar.
Hope that clarified things.