Things I liked: Mounts maintain perfect vertical alignment without the slight canting to the left or right seen on other mounts.
Things I would have changed: nonething
What others should know: These provided approx 3/8 inch clearance between the barrel of my CZ American 22LR and the 50mm objective lens of my Simmons 6.5-20 scope
Things I liked: Nothing. These were excellent pellets before they changed them. My Diana 34 could always put 5 shots in one hole at 10m. Those days are gone.
Things I would have changed: Return to the original JSB 4.52m pellet.
What others should know: I just bought 4 tins of these pellets. All 4 tins were marked with the same lot # 45450016. Previous versions of this pellet provided extreme accuracy in my D34 as mention above. I was expecting the same from these but my targets at 10m looked like they were shot with a shotgun. With these pellets my 10m varied from 3/4" to 1.5" ctc! I tested a few of the old version to make sure I didn't have a gun problem and they averaged less than .25" ctc. I then checked the weight and head size. While the weight of both versions was virtually the same the head size of this latest batch JSB 8.44 grain pellets was .002 to .003 undersized from the older (in my case more accurate) version of this same pellet. I only buy these for there accuracy and this purchase I will never waste my money on these pellets again until I see reports that they are no longer undersized. Just beware these are not the pellets they use to be if you like them in the past.
Things I liked: These are not the same 4.52mm JSB Diabolo Exact as I had bought before to use in my D34. Because of that there was very little to like about them. However, even though they were very disappointing in my D34, they were OK (not great) in my D48/177.
Things I would have changed: I would make them to the original spec. These are extremely undersized. Most measured 4.46mm or less in head size.
What others should know: These pellets no longer work in my D34. The original version of these pellets could be counted on to produce near single hole patterns at 10m. These produced shotgun type groups in comparison. Their weight was accurate at 8.44gr as the originals pellets I tested at the same time. However, their head size measured on average a minimum of .02mm less than the original version of this pellet. They are very loose in the breech of my M34 So unless you have a very tight bore the blow-by on these has a adverse impact on their accuracy. I will not buy them again for my D34 until JSB corrects the undersize condition. Fortunately, being loose in my D48 did not hurt their accuracy and as such I will not have to go though the return process with PA.