Oxidized Pellets?

I ordered four tins of pellets from PA a couple weeks ago, three were H&N field target trophy 14.66gr and another was a heavier pellet I was wanting to try. I opened one tin and shot some in the yard here at the house a few days ago, so today I took the rifle to my shop to shoot off my bench and took another tin with me so I would have pellets in both places. The pellets I opened today are oxidized and seem to fit tighter in the chamber. After shooting 30-40 rounds I decided to check the other tins to see how they look, they are fine, shiny looking and not not at all dull. 

Is this common? Should I contact PA? It seems that the one tin didn't get any lube like the others. 

Thanks
 
I just open a new tin of jsb18.13 gr my poi changed, i open another one and noticed that one is nice and smooth and the other looks like they take it out and put it into the can no lube nothing here is a photo righ hand side good ones left hand side bad ones 
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"1BadDart" The pellets I opened today are oxidized and seem to fit tighter in the chamber.
I would have just washed and lubed the pellets, but at least you got a free tin.

Depending on how often you shoot, your pellets are going to oxidize over times; even the most minute amount of air getting in will do it. I usually just get one of my Pyrex measuring cups, put my pellets in, dribble in some Dawn then some scalding hot water and gently stir. You will see the water muck up rapidly as the coating breaks down. Rinse thoroughly in a mesh utensil or colander, shake, and spread out over paper towels, patting most of the water away. You can use a hair dryer or set them out in the sun. I always clean the tin before returning, and dibble in a non-petroleum based oil [you don't want to diesel your rounds by any means], give a little stir with my finger or a pencil, seal back up and wallah! Cleaned pellets that will stay clean!

Make sure you wash your utensils well post clean [DO NOT use wood spoons or any porous utensils / containers!]

I have also used a 3 part water, 1 part lemon juice with about a teaspoon of salt as a gentle abrasive, put my pellets and liquid in an old bouillon twist top container with a 1/2" air gap and gently rocked the container back and forth for a while until the water turned icky gray, rinsed, dried, etc. This solution, once you've drained off the liquid, simply discard the container.

My buddy uses products similar to C.L.R., same as you can get rid of lime deposits in the bathroom, kitchen, coffee pots, etc. It works well, but hell, C.L.R costs money, and albeit at Wally-World you can get a 28oz. bottle for around $5.50 and will last you a long time, money is still money *Shrugs*.

Well there's my thoughts on it so give it a try. Then you will have 5 tins of sparkling pellets :D

--AGunBug