Make sure to pattern your gun before using buckshot. Some guns will shoot tight patterns at 30 yards others will not. Try a few different shells and buckshot sizes. I've had great luck with Federal Copper plated 00 buck

i dont shoot over 50 with 00 buck shoot but i use 3.00 inch

Get a box or two of shells and some target paper and see what kind of pattern your gun shoots. All full chokes do not pattern the same. I would try to keep it within 50 yards also.

You will never know until you shoot YOUR gun with that load. That will tell you where to aim at what distance and what sort of pattern you will get. You could probably extend your range a bit beyond 30 yards though with a full choke, shoot it and see. 40 or so is probably pretty doable but anything beyond 50 with buck shot is just reckless in my opinion. If you are going to shoot that far just use slugs.

Paul

I am only allowed to use buckshot so I have never killed a deer any other way. This will be my 22 season using buckshot and I am very comfortable shooting out to 50 yards. I have killed deer further but do not like to try it. I use a remington 870 3 1/3 and have a Kicks Industry Buck Kicker choke tube and it really tightens things up and I have patterned good out to 60 yards very constantly.