from one place shoot more or less accurately. Reduced accuracy usually is resolved by a barrel cleaning.
Maybe - but explain pulling a pellets from one tin yields fliers and the next tin shoots fine. Alternate all you want, the results are the same. Not Dirt.
Variation from one lot to another, regardless of who sold it to you.
I have a couple examples of this.
The first is a Brocock Concept Elite in .177 that I bought about 3 years ago on the tail-end of the guns marketing life (I actually bought the very last .177). They've since reused the name, but mine has a walnut thumbhole stock, LW barrel. Very accurate gun, WITH the right pellets. I had a couple boxes of Crosman Premier Heavies from around 2013-2014. The accuracy was just magic with those older batches of pellets. Good enough that I won Hunter Class FT matches four or five times with it (back in the 12x scope days), and the one time I entered our clubs "Unlimited" class, won that too. I've tried to buy boxed CPHs twice since I ran out of the old stock and both had unacceptable accuracy. Crosman's fault since they made the pellets, not PA or AOA.
The second example is a batch of 4 dozen JSB 10.34gr pellets that I bought from PA. I initially bought two dozen and PA had a good sale a couple of weeks later, so I bought another 2 dozen. These have been magic in my USFT. I've since finished off the first 24 tins and have about 16 tins left from the second batch of 24. Every tin I have thus far opened has been stellar, IN THAT GUN. No flyers, FT-winning accuracy. I actually shot my first perfect score last August with this batch of pellets. I don't even weigh or sort them. Now, same batch of pellets throws flyers from the above Brocock. Same batch of pellets also has the occasional flyer from the BSA Gold Star that I've had for the last 6 weeks. The BSA is also a FT-winning gun (it's accurate, WITH the right pellets). So, the EXACT same batch of pellets (I even went so far as to get all three gun out together to compare them, so the VERY SAME TIN) throws flyers out of two guns and not the other. (It would be very cool to know if these 48 tins were the same lot#, but with PA's generic sticker, no way to know).
Variation from one lot to the next, and whether or not a gun likes that particular batch.
It's been probably 5 or 6 years, but I remember Ted Bier (TedsHoldover youtube channel) had WTB adds out for a particular lot# of JSB pellets that he had extraordinary results with in a particular gun.
I'm sure every airgunner who gets very deep into the hobby has numerous similar stories. A batch of pellets that a gun doesn't care for as much as a previous batch is not the vendors fault. PA and AOA don't make pellets. I wouldn't even say it's JSBs fault, since a "bad batch" in one gun can be competition winning in a different gun.
Just the nature of the beast. Certain barrels prefer, not only certain pellets(brand/weight), but certain lots/batches of pellets.
