Things I liked:Tight fit in my high round count bores. What others should know:I got these because I've been investigating the relationship between pellet diameter and accuracy, and these are the largest lead projectiles pyramyd has in .177. They are a TIGHT fit in my worn bores. New barrels are probably too tight for these. I haven't tried them in my newer guns because I didn't buy these to use in those, and now that I know how tight they fit loose bores, I don't want to. They group acceptably to 50' for me. I don't know if that's the norm or not, these are the first Runtkugels I've used.