Remington Heavy shot and similar Bismuth/Tungsten projectiles are supposed to pattern and act similar to lead. Not like steel, they can use conventional chokes as far as I have been informed by many knowlegeable people. To attest, I have used Full choke for geese with a Remington 1100 in pass-shooting. Tough damn birds those geese, especially when the weather is nice and they are flying high......... :hammering: