If it's any help, our club imports about £300 to £400 worth of JSB pellets every month, and we haven't had any bad batches in terms of damage or poor manufacture for a year or so. Bear in mind though that some pellets are made with newer dies. For example, the Exact RS in 22 calibre is better made than the normal Exact Jumbo 15.9 grain, and it appears the 5.51 Jumbos are better than the 5.52 Jumbos. Everything in 177 appears to be well made. The 10.3 grain heavies are popular, another convert today.