This one is a 12 ga er bore and it's only chambered for 2 3/4. I lean toward lighter loads as only wish to kill the birds in the air. I plan to process them on the ground. There is a shell call the Texas dove load, it could also called the low flying airplane load as it contains enough powder and shot for a Jihad. Ive asked why people buy these loads and am told they are the only load that will cycle in their gun and all they get with lighter loads is feathers. I have to bite my tongue to not tell them to clean their gun and quit shooting the birds in the butt.