Mine loved the H&N baracuda 4.52 @ 860 fps. It hated any JSB I put thru it.
Not only are crosman pellets not consistant they tend to lead up my guns, which is a real hassle.
I had to polish the lead, transfer port hole in the barrel and the mags...
JSB Kings it hated everything else I tried I had to polish the lead, transfer port hole in the barrel and the mags plus recrown all mine before they shot good. The softer JSB pellets were shaved very bad in my .25 and .22 Hatsans before I polished them out. The .22 also loves the JSB after working it over so the .177 was the only one that even after smoothing it out it didnt like the JSB.
I have a lathe so I just chucked the barrel up and cut the crown.