Nope, not surprised at all Bill, with the size issue, not one bit. But as you say they do group/shoot pretty well at close range. I have two Umarex pistols; the Walther CP-99 and the Walther CP-88 [the CP88 is the competition model with better sights and a 6" barrel instead of the 4"). My point is, between the two guns I have 13 - 8-shot rotary clips and I used the Crosman
"Competition Premium Grade" (!SO CALLED!) from the local stores, for a long time. These Pellets, which until recently, were the only WC's I could find locally, except for the Daisy Wobble Cutters @ KameApart.
Now my local Big 5 is stocking RWS Diabolo Basics [7.0gr]. They give better accuracy, more consistent size, and for my CO2 pistols 0.9gr less doesn't hurt either. A tin of 500 RWS Basics go for $7.99. Expensive?? Crosman "Premium Grade Competition" are going for $3.99 for a tin of 250, that's $7.98 for 500! I dont have a problem paying 1¢ more for a much better pellet. I hope to see them [Big 5] keep adding new brands and types of pellets to their stock. They have also added the .177 Beeman Coated Hollow Points. I bought some but haven't shot more than 3 or 4 of them, as I had just received a shipment of .177 CPL's and CPH's, which my Titan likes.
When I am loading my rotary clips, I'll notice quite a difference in the diameter some even fall out the back of the clip. When this happens I have tried the undersized pellet in in another hole and it is loose there also. If I put a different pellet in; it fits snug like the rest. So that is how I have found out the pellets were the problem and not the well machined, aluminum clips. I believe that these loose pellets are responsible for 3 cut and blown out Breech Seals in my GAMO PT-80. I think a loose pellet backed out and as the mag rotated for the next shot it got cut. For replacements I had to order from "across the pond, from TW Chambers Gunmakers. GAMO, will NOT sell them but, they will sell you a 3 or 4 pack of CO2 Cartridge Tip seals which will leak on you and blow out the 1st time you load a CO2. They are undersized on the O.D. and oversized on the I.D. One of them blew right up around the neck of the cartridge as soon as I tightened it. The brass collar that is supposed to hold down the seal has an inside diameter of 3/8ths of an inch and the outside diameter of the repacement seal is also 3/8ths. Quite a feat of engineering, huh? BTW, Chambers carries the same seal. So I have one PT-80 that works great and another collecting dust until I find some suitable material that I can punch a seal out of. When I do; I'll just make a pile of them and hand them out to whomever here needs one. I'll even supply the envelope and stamp.
HEY GAMO!!!! Are you reading this my Email is.... OH Yeah!! You already have quite a few of my Emails-----FIGURE it out.
The "Cheapo" CWC pellets also load very easily into my Hammerli Titan; ANY other pellet I have to seat it by rolling the back of my thumbnail over the skirt. Thanks to whoever mentioned that thumbnail trick. I was tired of having to carry around some sort of tool to seat my pellets (like the side of a Sharpie cap, my Zippo lid, et al.) and I did NOT want to try and make the chamber area a little larger. The Titan just shoots too good to mess with something that can't be undone!
Have a Great Day at a Great Place To Be!

Roy Cross
N. CA [The State soon to raise sales tax in our county and from 7.25% to 9%] Too Bad Arnold doesn't live in N. CA., where the Capitol City is. (.9.0% Statewide). Please excuse my small political rant/signature. LOL