First the JSB Exacts. These are 4.50 head size and are the best shooting in my old TF79T and my Air Arms S200

I noticed a bit of thin skirts on these, but not too bad. What I did notice is that they roll all over on their own, meaning the skirts aren't round..., but also not too bad.

Next was the CPL's. They are more "shiny" than the JSB's, but they left a residue on the paper I set them on for the pictures. The skirt isn't nearly as deep as the skirt on the JSB's. They shoot well in both my AA S200 and S400C, but neither shoots the "best" over others in those two guns. The S400C LOVES Kodiaks, and the S200 as I said before likes the JSB 4.50's, although it loosens up quite a bit with JSB 4.52's...never tried 4.51's or 4.53's, don't have any. CPL's in my S200 are a little looser than 4.52's or 4.50's, every gun has its favorite.

The skirt thickness is noticeably thicker than on the JSB's, and at first glance seemed rounder, but when I flipped these devils on their sides they rolled around on their own even worse than the JSB's....so I suspect the JSB's are actually rounder, just harder to tell because the skirts are so thin...kind of an "optimagical" illusion:)

Then I spotted this one CPL that I hadn't noticed before. She had a flat tire....doh!

I also have some Crosman Heavies that shoot SUPER good in my long lost Career 707, but same gun didn't like anything else nearly as well. The CP Heavies are compareable in quality to the CPL's, but are a bit dirtier, both came in the cardboard bulk box. Also worth noteing, my R7 loved CPL's, but was marginally less accurate with JSB's. I've also noticed that just about any airgun with a LW barrel that I have shot loves Kodiaks, including my FX Black Widow, AA S400C, and my Airforce TalonSS. My Big Ed tuned B51 loved Crosman Heavies, and was deadly accurate with them. Oddly enough I have a QB78 that doesn't shoot ANYTHING well except for Daisy Maxspeed wadcutters....go figure.
I think I have pretty muched come to the conclusion that every gun has a preference, and usually there is little rhyme or reason to it except for LW barrels and Kodiaks. I keep a good selection of most popular pellets and usually try 4-5 different pellets before I find one I think the gun is truly happy with....can't judge a book by its cover:)