I'm refering to what JSB calls their Match Diabolo Exact Jumbo RS. I bought some of these to try in my Crosman 2260. I figured they would be a good weight for a relatively low powered (about 10 FPE) CO2 rifle. The results have been quite good. At 20 yards 1/2 inch groups are pretty easy and I think with some practice 1/4 inch may be possible. They are typical JSB quality. However, the skirts on these pellets are very thin and somewhat soft so they need to be handled with care. Now then, my question. I have read on the PA reviews that these pellets shoot well in the RWS 34 and am considering trying them in my 34 Panther (although I can't imagine any pellet that is better in my Panther than the JSB Express 14.3 gn). The question is, are these pellets too light to use in a 34 or any other springer? Will they cause piston slam and possible damage with repeated use?
