I recently bought a Uragan 2 25 cal from Derrick Wall. He tuned it for slugs and let me say this gun is a hammer! POI is very consistent and repeatable more so than the flimsy straw barrel gun I sold. But to get back to the projectile, Derrick shot H&N 42 gr and Varmint Knockers. I purchased both along with Patriot slugs but was only able to shoot the Varmint Knockers As I had 2 minor operations in the last 2 weeks lol. The VK are knurled and sized to 253, they seemed very clean so I lightly lubed them with ballistol and they seem very promising. Groups out to 50 and 100 seem very consistent. (Top 2 squares are me adjusting my scope. Middle was 10 shot group, bottom left 4 shots bottom right 6 shots. All at 100 yards.) Still learning gun, but gun seems to like the knurled VKs.