A:
The mid-range Carlson tube is .710 in. on a Remington 12 ga., .700 on the long range. They are a Modified and Full choke. I have such good results with the mid-range, I don't change tubes. From 50 to in-your-face-screaming-fast yards, this thing is murder on woodducks. It patterns like a screen door; nothing flies through it! Most of my shooting for ducks is with #2 3" loads, but it does the same with BBs and #4s. Hope this helps! RRB