In my Remington® SPR220 (Baikal® IZH-43) 20ga SxS gun; through Colonial Arms® .570" & .575" chokes, they pattern better than any Pb load from any manufacturer. The specific load I'm referring to is..........
• Remington® Nitro Turkey™ 20ga 3" Mag 1185fps 1¼oz #5 (NT20M5)
This is a buffered Pb load and the shot IS NOT copper-plated.
I also tried the Remington® Premier® Magnum 3" Mag 1¼oz #6 Cu plated Pb and it was ABSOLUTE CRAP in my three 20ga guns through 11 choke combinations.