A lot of us are experimenting with your .177 caliber rifles with slugs. You have put all your development into larger calibers which are working well, but your barrel liners need work. My Dreamline shoots pellets and slugs equally well, for a while at least, then they lead up in the choke after 100-140 shots. Cleaning reveals a huge amount of lead in the choke area, especially when shooting slugs. It's time to adjust your liner manufacturing process to reduce the amount of choke in that area. I'm finding that projectiles are being squeezed down 0.005 which is way too much for that caliber. Seems to me that 0.002 shoud be enough. There is no way to remove that much material from the bore by polishing. Hear that, shooters? Polishing only knocks off the microscopic burrs and high spots in the bore.
I'm waiting.....
I'm waiting.....